{"id":6819,"date":"2026-08-07T09:00:00","date_gmt":"2026-08-07T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=6819"},"modified":"2026-08-07T17:40:04","modified_gmt":"2026-08-07T17:40:04","slug":"paint-coverage-calculator-sq-ft-to-gallons","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/paint-coverage-calculator-sq-ft-to-gallons\/","title":{"rendered":"Paint Coverage Calculator: Square Feet to Gallons (2026)"},"content":{"rendered":"<p><script>\ndocument.addEventListener('DOMContentLoaded', function() {\n  var sels = ['.entry-header','.page-header','article > h1:first-child','.entry-footer'];\n  sels.forEach(function(s){document.querySelectorAll(s).forEach(function(el){el.style.display='none';});});\n  var el = document.querySelector('.sw-a');\n  while (el && el !== document.body) {\n    el.style.maxWidth='100%'; el.style.width='100%'; el.style.padding='0'; el.style.margin='0';\n    el.style.float='none'; el.style.flex='0 0 100%';\n    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h2{font-size:25px;}.sw__tldr{padding:24px 22px;}.sw__tldr-cta{align-items:flex-start;}.sw__tldr-cta a{white-space:normal;}.sw__steps>li{padding:18px 0 18px 56px;}.sw__steps>li::before{left:0;width:42px;height:42px;font-size:17px;}.sw__table{font-size:13.5px;}.sw__table th,.sw__table td{padding:10px 14px;}.sw__promo{padding:32px 22px;}.sw__faq{padding:44px 0;}.sw__faq h2{font-size:26px;}.sw__final{padding:64px 0;}.sw__final h2{font-size:30px;}.sw__btn--lg{width:100%;text-align:center;}}<\/style>\n<p><script>\n(function(){\n  try{\n    var b=document.body;\n    if(b && b.classList){b.classList.add('single-post');}\n  }catch(e){}\n})();\n<\/script><\/p>\n<article class=\"sw\">\n<header class=\"sw__hero\">\n<div class=\"sw__inner\">\n<nav class=\"sw__crumb\">Blog &nbsp;&rsaquo;&nbsp; Painting &nbsp;&rsaquo;&nbsp; Paint Coverage Calculator<\/nav>\n<p><span class=\"sw__eyebrow\">Painting &middot; Coverage Calculator<\/span><\/p>\n<h1>Paint Coverage Calculator: Square Feet to Gallons<\/h1>\n<p class=\"sw__dek\">A field-tested paint coverage calculator that turns square feet into gallons: wall area, coverage rate per gallon, number of coats, primer, and trim, with a worked example.<\/p>\n<p class=\"sw__dek-cta\">In a hurry? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Price a job from a photo<\/a> in about six seconds.<\/p>\n<div class=\"sw__rating\"><span class=\"sw__stars\">&#9733;&#9733;&#9733;&#9733;&#9733;<\/span> <b>4.8<\/b> <span class=\"sw__rating-sub\">on the App Store<\/span><\/div>\n<div class=\"sw__meta\">\n<span>SimplyWise<\/span><br \/>\n<i><\/i><br \/>\n<span>Updated August 7, 2026<\/span><br \/>\n<i><\/i><br \/>\n<span>10 min read<\/span>\n<\/div>\n<figure class=\"sw__fig\">\n<img decoding=\"async\" alt=\"Roller applying white paint over a beige interior wall\" loading=\"eager\" src=\"https:\/\/images.unsplash.com\/photo-1693985120993-e9b203ce7631?w=1400&amp;h=700&amp;fit=crop&amp;q=80&amp;auto=format\"\/><br \/>\n<\/figure>\n<\/div>\n<\/header>\n<div class=\"sw__body\">\n<div class=\"sw__inner\">\n<aside class=\"sw__tldr\">\n<div class=\"sw__tldr-label\">Paint coverage calculator, in 6 steps<\/div>\n<ol>\n<li>Find wall area. Add all wall lengths for the perimeter, then multiply by ceiling height in feet.<\/li>\n<li>Subtract doors and windows only when total openings exceed 15 percent of wall area.<\/li>\n<li>Divide wall area by the coverage rate per gallon. Smooth drywall runs 350 to 400 sq ft per coat.<\/li>\n<li>Multiply by the number of coats. Two coats is the residential default.<\/li>\n<li>Add a primer line on bare, patched, or color-change surfaces at 200 to 300 sq ft per gallon.<\/li>\n<li>Calculate ceilings and trim as their own square-foot and linear-foot lines.<\/li>\n<\/ol>\n<div class=\"sw__tldr-cta\"><span>Quoting a repaint this week?<\/span><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><\/div>\n<\/aside>\n<h2>How a paint coverage calculator converts square feet to gallons<\/h2>\n<p>A paint coverage calculator turns square feet into gallons with one core formula. Wall area divided by the coverage rate per gallon, multiplied by the number of coats. Wall area is the room perimeter times the ceiling height. <a href=\"https:\/\/www.sherwin-williams.com\/en-us\/color\/color-tools\/paint-calculator\" rel=\"noopener\" target=\"_blank\">Sherwin-Williams<\/a> puts typical coverage at about 350 to 400 square feet per gallon, enough for a 10 ft by 10 ft room. Two coats is the residential default. So a room with 360 sq ft of wall painted twice needs about 2 gallons.<\/p>\n<p>Painting is a $49.1 billion U.S. industry in 2026, per the <a href=\"https:\/\/www.ibisworld.com\/united-states\/market-research-reports\/painters-industry\/\" rel=\"noopener\" target=\"_blank\">IBISWorld Painting and Wall Covering Contractors report<\/a>. The <a href=\"https:\/\/www.bls.gov\/ooh\/construction-and-extraction\/painters-construction-and-maintenance.htm\" rel=\"noopener\" target=\"_blank\">Bureau of Labor Statistics<\/a> counted 342,200 construction and maintenance painters in 2024, at a median wage of $23.40 an hour. Plenty of them still size paint by eye at the store counter. A paint coverage calculator removes the guess. <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a> turns a photo into an itemized estimate in about 6 seconds, with material quantities you can check against the numbers above.<\/p>\n<h3>The formula in one line<\/h3>\n<p>Gallons equals wall area in sq ft, divided by coverage per gallon, times the number of coats. Take 360 sq ft of smooth wall at 375 sq ft per gallon for two coats. That is 360 divided by 375, times 2, which equals 1.92 gallons. Round up to 2. Always round each line up to the next whole gallon. Running short mid-job costs more in a return trip than the extra gallon costs at the counter.<\/p>\n<h2>Step 1: Measure wall area<\/h2>\n<p>The calculator needs wall area first, and wall area is the room perimeter times the ceiling height. Add the length of all four walls to get the perimeter. Then multiply by the ceiling height in feet. A 12 ft by 15 ft room has a perimeter of 54 ft. At an 8 ft ceiling that is 54 times 8, or 432 sq ft of gross wall area before deductions.<\/p>\n<p>For an L-shaped or bumped-out room, walk the baseboard. Add every straight run as its own length, including the short returns. Skipping them is a common way to undershoot wall area by 5 to 10 percent.<\/p>\n<h2>Step 2: Subtract doors and windows<\/h2>\n<p>Next, decide whether to deduct openings. Leave windows and doors in the wall area unless total openings exceed 15 percent of the wall. Cutting in around the trim eats the surface area you would have saved. A standard interior door is about 20 sq ft. A typical window is about 15 sq ft.<\/p>\n<h3>The 15 percent rule worked out<\/h3>\n<p>On the 432 sq ft room above, 15 percent is about 65 sq ft. One door and two windows come to about 50 sq ft, so they stay in the wall area. They fall under the threshold, and the cutting-in labor offsets the saved paint. A sunroom with 120 sq ft of glass on the same wall clears the threshold. There, deduct the glass and quote the trim cutting-in as its own labor line.<\/p>\n<p class=\"sw__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Size the paint and price the job from a photo, free<\/a><\/p>\n<h2>Step 3: Apply the coverage rate per gallon<\/h2>\n<p>Now divide the net wall area by the coverage rate for the surface. Coverage drops sharply on textured, porous, or rough surfaces. A calculator that uses one flat number for every surface will underbuy on stucco and overbuy on smooth drywall.<\/p>\n<div class=\"sw__table-wrap\">\n<table class=\"sw__table\">\n<thead>\n<tr>\n<th scope=\"col\">Surface type<\/th>\n<th scope=\"col\">Coverage per gallon (one coat)<\/th>\n<th scope=\"col\">Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Smooth interior drywall, latex flat or eggshell<\/td>\n<td>350 to 400 sq ft<\/td>\n<td>Sherwin-Williams published typical coverage<\/td>\n<\/tr>\n<tr>\n<td>Smooth primed drywall, semi-gloss or satin<\/td>\n<td>350 to 400 sq ft<\/td>\n<td>Same smooth substrate<\/td>\n<\/tr>\n<tr>\n<td>Lightly textured (orange peel)<\/td>\n<td>300 to 350 sq ft<\/td>\n<td>Roughly 10 to 15 percent loss against smooth<\/td>\n<\/tr>\n<tr>\n<td>Heavily textured (knockdown, popcorn)<\/td>\n<td>200 to 300 sq ft<\/td>\n<td>Deep profile holds more paint<\/td>\n<\/tr>\n<tr>\n<td>Bare drywall (primer coat)<\/td>\n<td>200 to 300 sq ft<\/td>\n<td>Absorbent substrate, primer rate<\/td>\n<\/tr>\n<tr>\n<td>New, unprimed wood<\/td>\n<td>250 to 350 sq ft<\/td>\n<td>Higher absorption than primed wood<\/td>\n<\/tr>\n<tr>\n<td>Stucco or rough exterior masonry<\/td>\n<td>100 to 200 sq ft<\/td>\n<td>Heavy first-coat absorption<\/td>\n<\/tr>\n<tr>\n<td>Brick or split-face block<\/td>\n<td>100 to 200 sq ft<\/td>\n<td>Open texture, heavy first coat<\/td>\n<\/tr>\n<tr>\n<td>Smooth ceiling, flat ceiling paint<\/td>\n<td>350 to 400 sq ft<\/td>\n<td>Treat as its own square-foot line<\/td>\n<\/tr>\n<tr>\n<td>Wood trim, semi-gloss enamel<\/td>\n<td>350 to 400 linear ft (3-inch trim)<\/td>\n<td>Trade rule of thumb, converted from linear feet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The smooth-drywall figure is Sherwin-Williams&#8217; published typical coverage. The other rows are working trade ranges, not manufacturer claims. Pull the technical data sheet for the exact product on hand and use its published spread rate whenever the buy is large.<\/p>\n<h2>Step 4: Multiply by the number of coats<\/h2>\n<p>Multiply the gallons figure by the number of coats. Residential repaint prices two finish coats by default. Color changes, going lighter, painting over stains or repairs, and warranty exposure all push scope to two coats. Single-coat pricing is reserved for a same-color refresh on premium paint over a clean substrate.<\/p>\n<h3>When the calculator needs three coats<\/h3>\n<p>Some jobs need three. A dark-to-white color change is the classic case. So are bright reds and yellows, whose pigments hide poorly. Bare or stained surfaces pull the first coat in unevenly and need another. A deep accent wall going back to white is where two coats leave a ghost and the painter eats the third coat for free. Add the third coat to the calculator instead of hoping.<\/p>\n<h2>Step 5: Add a primer line<\/h2>\n<p>Primer is its own line, not part of the finish-paint math. It belongs on bare drywall, bare wood, patched repairs, stained surfaces, and dramatic color changes. Primer covers less per gallon than finish paint, because the substrate is more absorbent. Bare drywall and patched walls run 200 to 300 sq ft per gallon of primer. Size primer on the same wall area, at the lower rate.<\/p>\n<h3>When you can skip primer<\/h3>\n<p>You can skip a dedicated primer coat on a clean, previously painted surface in a similar color with a self-priming paint. Self-priming finish paints still spread at the finish rate, not the primer rate, so the calculator does not change. The decision is binary. Either add a primer line at 200 to 300 sq ft per gallon, or rely on the finish paint and keep the two-coat math.<\/p>\n<h2>Step 6: Calculate ceilings and trim separately<\/h2>\n<p>Ceilings and trim never share the wall-paint line. A calculator that lumps walls, ceiling, and trim into one number will misbuy on at least one of them. Each uses a different product and a different unit.<\/p>\n<h3>Ceiling math<\/h3>\n<p>Ceiling area equals room length times width. A 12 ft by 15 ft room has a 180 sq ft ceiling. At 375 sq ft per gallon, that ceiling needs about half a gallon for one coat, or just under a gallon for two. Ceilings often take one coat on a same-color refresh. A repair or a smoke-stained ceiling needs two coats plus a stain-blocking primer.<\/p>\n<h3>Trim and door math<\/h3>\n<p>Trim converts from linear feet. Add up baseboard, casing, and crown, then divide by 350 to 400 linear feet per gallon. A room with about 94 linear ft of trim needs well under a gallon of enamel for two coats. That is 54 ft of baseboard plus 40 ft of casing. Doors count per door, both sides, two coats. A typical six-panel door uses roughly a quarter of the per-gallon trim coverage.<\/p>\n<h2>Worked example: a 12 by 15 ft bedroom, color change<\/h2>\n<p>Take a 12 ft by 15 ft bedroom with 8 ft ceilings, one door, two windows, smooth drywall, and a beige-to-navy color change. The math runs through every line: walls, primer, ceiling, and trim.<\/p>\n<ol class=\"sw__steps\">\n<li>\n<h3>Wall area<\/h3>\n<p>Perimeter is 12 plus 15 plus 12 plus 15, which equals 54 ft. At an 8 ft ceiling, gross wall area is 432 sq ft. One door and two windows total about 50 sq ft, under the 65 sq ft threshold, so leave them in. Net wall area stays 432 sq ft.<\/p>\n<\/li>\n<li>\n<h3>Wall paint<\/h3>\n<p>432 divided by 375 equals 1.15 gallons per coat. The beige-to-navy change needs two coats, so that is 2.3 gallons. Round up to 3 gallons to cover the dark-over-light hide and cutting-in waste.<\/p>\n<\/li>\n<li>\n<h3>Primer<\/h3>\n<p>The dramatic color change calls for a tinted primer coat over the full 432 sq ft. At 250 sq ft per gallon, that is 1.7 gallons. Round up to 2 gallons of primer.<\/p>\n<\/li>\n<li>\n<h3>Ceiling<\/h3>\n<p>Ceiling area is 12 times 15, which equals 180 sq ft. At 375 sq ft per gallon for two coats, that is about 0.96 gallon. Round up to 1 gallon of flat ceiling paint.<\/p>\n<\/li>\n<li>\n<h3>Trim and door<\/h3>\n<p>About 94 linear ft of trim plus one door, at 350 to 400 linear ft per gallon for two coats, is well under a gallon. Buy 1 gallon of trim enamel for the trim and both door faces.<\/p>\n<\/li>\n<li>\n<h3>Shopping list<\/h3>\n<p>The calculator outputs 3 gallons of wall paint, 2 of primer, 1 of ceiling paint, and 1 of trim enamel. That is the full buy for one bedroom with no return trip, because every line rounded up.<\/p>\n<\/li>\n<\/ol>\n<div class=\"sw__callout\"><strong>Rule of thumb:<\/strong> always round each line up to the next whole gallon. A spare half-gallon costs less than a second trip to the store. Leftover paint becomes the customer&#8217;s touch-up can, which is a nice closing detail on the quote.<\/div>\n<h2>Quick-reference paint coverage table<\/h2>\n<p>For a fast on-the-truck conversion, the table below pairs common scenarios with a gallons estimate for two coats. Treat these as starting points. Confirm against the calculator math above for the surface and color change in front of you.<\/p>\n<div class=\"sw__table-wrap\">\n<table class=\"sw__table\">\n<thead>\n<tr>\n<th scope=\"col\">Scenario<\/th>\n<th scope=\"col\">Wall area (approx)<\/th>\n<th scope=\"col\">Coverage per gallon<\/th>\n<th scope=\"col\">Gallons for two coats<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Small bedroom or office (10 by 10 ft)<\/td>\n<td>320 sq ft<\/td>\n<td>375 sq ft<\/td>\n<td>2 gallons<\/td>\n<\/tr>\n<tr>\n<td>Standard bedroom (12 by 15 ft)<\/td>\n<td>432 sq ft<\/td>\n<td>375 sq ft<\/td>\n<td>3 gallons<\/td>\n<\/tr>\n<tr>\n<td>Living room (15 by 20 ft, 9 ft ceiling)<\/td>\n<td>630 sq ft<\/td>\n<td>375 sq ft<\/td>\n<td>4 gallons<\/td>\n<\/tr>\n<tr>\n<td>Single accent wall (12 ft wide, 8 ft tall)<\/td>\n<td>96 sq ft<\/td>\n<td>375 sq ft<\/td>\n<td>1 gallon<\/td>\n<\/tr>\n<tr>\n<td>Whole 1,500 sq ft home interior (walls)<\/td>\n<td>3,500 to 4,500 sq ft<\/td>\n<td>375 sq ft<\/td>\n<td>19 to 24 gallons<\/td>\n<\/tr>\n<tr>\n<td>Ceiling, standard bedroom (12 by 15 ft)<\/td>\n<td>180 sq ft<\/td>\n<td>375 sq ft<\/td>\n<td>1 gallon<\/td>\n<\/tr>\n<tr>\n<td>Textured wall, standard bedroom (12 by 15 ft)<\/td>\n<td>432 sq ft<\/td>\n<td>250 sq ft<\/td>\n<td>4 gallons<\/td>\n<\/tr>\n<tr>\n<td>Trim run (per 94 linear ft, 3-inch trim)<\/td>\n<td>94 linear ft<\/td>\n<td>375 linear ft<\/td>\n<td>1 gallon<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The whole-home figure is the one most often underbought. It is easy to forget closets, hallways, and stairwells. Walk every paintable room and add each perimeter before you run the whole-home line.<\/p>\n<h2>Why a paint coverage calculator protects your margin<\/h2>\n<p>Mis-sizing paint cuts both ways. Overbuying eats material margin directly. Underbuying triggers a return trip that burns an hour of labor. A calculator that lands the buy on the first trip protects both lines at once. Once gallons are locked, paint cost flows into the material line and the coat count flows into application hours. That is why the calculator is the first input to the full estimate covered in the <a href=\"\/blog\/how-to-estimate-painting-job\/\">SimplyWise guide on how to estimate a painting job<\/a>.<\/p>\n<h2>From coverage calculator to a same-day quote<\/h2>\n<p>Plenty of painters still size paint the same way. Walk the room, scribble dimensions on a clipboard, do the division in the truck, then guess at the store. That workflow leaves room for an arithmetic slip on every line. The painter who hands over a clean, itemized quote on site wins jobs from the one who promises a number tomorrow.<\/p>\n<h3>Photo to estimate with SimplyWise<\/h3>\n<p>SimplyWise Cost Estimator builds the estimate from a phone photo. The painter photographs the wall, ceiling, or trim and adds the room measurements in the project description. The app returns an itemized estimate in about 6 seconds, with material quantities. Every line item carries unit, quantity, and price, so you can edit any material, labor, or fee line on the spot. On Pro iPhones, a LiDAR room scan captures measurements. You can then hand over a professional, branded quote the client signs to approve. To put the numbers on paper afterward, pair it with the free <a href=\"\/blog\/painting-invoice-template\/\">SimplyWise painting invoice template<\/a>.<\/p>\n<section class=\"sw__promo\">\n<h2>Size the paint before you leave the room<\/h2>\n<p>SimplyWise Cost Estimator costs $29.99\/mo or $239.99\/yr. That works out to about $20\/mo on annual. Every plan starts with a 7-day free trial, so you can run it on the next few repaints first.<\/p>\n<p><a class=\"sw__btn\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><br \/>\n<\/section>\n<h3>What is included<\/h3>\n<ul>\n<li>Photo to itemized estimate in about 6 seconds.<\/li>\n<li>Estimates that come back with material quantities.<\/li>\n<li>Editable material, labor, and fee line items.<\/li>\n<li>Unit, quantity, and price on every line item.<\/li>\n<li>LiDAR room scans on Pro iPhones to capture measurements.<\/li>\n<li>Professional, branded quotes the client signs to approve.<\/li>\n<\/ul>\n<div class=\"sw__sources\">\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.sherwin-williams.com\/en-us\/color\/color-tools\/paint-calculator\" rel=\"noopener\" target=\"_blank\">Sherwin-Williams, Paint Calculator FAQs<\/a> (a gallon of paint typically covers about 350 to 400 square feet; verified live 2026-08-07).<\/li>\n<li><a href=\"https:\/\/www.ibisworld.com\/united-states\/market-research-reports\/painters-industry\/\" rel=\"noopener\" target=\"_blank\">IBISWorld, Painting and Wall Covering Contractors in the US<\/a> (market size $49.1bn in 2026; August 2026 release, verified live 2026-08-07).<\/li>\n<li><a href=\"https:\/\/www.bls.gov\/ooh\/construction-and-extraction\/painters-construction-and-maintenance.htm\" rel=\"noopener\" target=\"_blank\">U.S. Bureau of Labor Statistics, Painters, Construction and Maintenance<\/a> (342,200 jobs, $23.40 median hourly pay, 2024; verified live 2026-08-07).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<section class=\"sw__faq\">\n<div class=\"sw__inner\">\n<h2>Frequently asked questions about the paint coverage calculator<\/h2>\n<h3 class=\"sw__faq-cat\">The coverage math<\/h3>\n<details>\n<summary>How do you calculate how many gallons of paint you need?<\/summary>\n<div>\n<p>Use one formula. Gallons equals wall area divided by coverage per gallon, times the number of coats. Wall area is the room perimeter times the ceiling height. Sherwin-Williams puts typical coverage at about 350 to 400 sq ft per gallon. Two coats is the residential default. Round each line up to the next whole gallon.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How many square feet does a gallon of paint cover?<\/summary>\n<div>\n<p>Sherwin-Williams puts typical coverage at about 350 to 400 square feet per gallon, enough for a 10 ft by 10 ft room. Working trade ranges run lower on rougher surfaces: 300 to 350 sq ft on lightly textured walls, and 200 to 300 sq ft on heavy texture, bare drywall, or stucco. Check the technical data sheet for the product on hand.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How do you find wall area for the calculator?<\/summary>\n<div>\n<p>Wall area equals the room perimeter times the ceiling height. Add the length of all walls to get the perimeter, then multiply by the height in feet. A 12 ft by 15 ft room has a 54 ft perimeter. At an 8 ft ceiling that is 432 sq ft of gross wall area. For L-shaped rooms, measure each wall run individually and sum the lengths.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"sw__faq-cat\">Coats, primer, and openings<\/h3>\n<details>\n<summary>Should the calculator use one coat or two?<\/summary>\n<div>\n<p>Two coats for almost every residential repaint. Color changes, going lighter, painting over stains or repairs, and warranty exposure all push scope to two finish coats. Use three coats on dark-to-white changes and on bright reds or yellows. Single-coat pricing is reserved for a same-color refresh on premium paint over a clean surface.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Do I subtract doors and windows from wall area?<\/summary>\n<div>\n<p>Only when total openings exceed about 15 percent of the wall area. Cutting in around the trim eats the surface area you would have saved. A standard interior door is about 20 sq ft and a typical window about 15 sq ft. On a room with a wall of windows or large patio doors, deduct the actual opening area and quote the trim cutting-in as its own labor line.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Does the calculator include primer?<\/summary>\n<div>\n<p>Primer is its own line, not part of the finish-paint math. Add a primer line on bare drywall, bare wood, patched repairs, stained surfaces, and dramatic color changes. Primer covers less than finish paint at 200 to 300 sq ft per gallon, so size it on the same wall area at the lower rate. You can skip a dedicated primer coat when repainting a clean, similar-color surface with a self-priming paint.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"sw__faq-cat\">Ceilings, trim, and SimplyWise<\/h3>\n<details>\n<summary>How do you calculate ceiling and trim paint separately?<\/summary>\n<div>\n<p>Ceiling area equals room length times width, at 350 to 400 sq ft per gallon of flat ceiling paint. Trim is measured in linear feet and converts at about 350 to 400 linear ft of standard 3-inch trim per gallon of enamel. A 12 ft by 15 ft room has a 180 sq ft ceiling and roughly 94 linear ft of trim. Each uses a different product and unit, so never lump them into the wall line.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Can I price a paint job from a photo?<\/summary>\n<div>\n<p>Yes. SimplyWise Cost Estimator turns a photo of the wall, ceiling, or trim into an itemized estimate in about 6 seconds, with material quantities. Add the room measurements in the project description. Every line item carries unit, quantity, and price, so you can edit any material, labor, or fee line before you send it. On Pro iPhones, a LiDAR room scan captures measurements.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How much does SimplyWise Cost Estimator cost?<\/summary>\n<div>\n<p>SimplyWise Cost Estimator is $29.99\/mo, or $239.99\/yr, which works out to about $20\/mo on annual. Every plan starts with a 7-day free trial. The plan covers photo to itemized estimate with material quantities, live material pricing, LiDAR room scans on Pro iPhones, and professional branded quotes the client signs to approve.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/section>\n<section class=\"sw__final\">\n<div class=\"sw__inner\">\n<span class=\"sw__eyebrow\">Size the paint in seconds<\/span><\/p>\n<h2>Skip the store-counter guess and size the paint on site<\/h2>\n<p>Photograph the room, get an itemized estimate in about 6 seconds, then hand the customer a professional, branded quote before you leave the driveway. SimplyWise Cost Estimator is free to try, with a 7-day free trial.<\/p>\n<p><a class=\"sw__btn sw__btn--lg\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><\/p>\n<p class=\"sw__final-alt\"><a href=\"\/blog\/painting-invoice-template\/\">Get the painting invoice template<\/a><\/p>\n<\/div>\n<\/section>\n<\/article>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"headline\": \"Paint Coverage Calculator: Square Feet to Gallons\",\n  \"description\": \"Paint coverage calculator that converts square feet to gallons: wall area, coverage rate per gallon, number of coats, primer, ceilings, and trim, with a worked example and a quick-reference table.\",\n  \"author\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\"},\n  \"publisher\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\", \"logo\": {\"@type\": \"ImageObject\", \"url\": \"https:\/\/www.simplywise.com\/icon-512x512.png\"}},\n  \"datePublished\": \"2026-08-07\",\n  \"dateModified\": \"2026-08-07\",\n  \"mainEntityOfPage\": \"https:\/\/simplywise.com\/blog\/paint-coverage-calculator-sq-ft-to-gallons\/\",\n  \"image\": \"https:\/\/images.unsplash.com\/photo-1693985120993-e9b203ce7631?w=1400&h=700&fit=crop&q=80&auto=format\"\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"HowTo\",\n  \"name\": \"How to run a paint coverage calculator on a room\",\n  \"description\": \"A worked method for converting a room's square feet into gallons of paint: wall area, wall paint, primer, ceiling, trim, and the final shopping list.\",\n  \"totalTime\": \"PT10M\",\n  \"tool\": [\n    {\"@type\": \"HowToTool\", \"name\": \"Tape measure or laser measure\"},\n    {\"@type\": \"HowToTool\", \"name\": \"Product technical data sheet\"},\n    {\"@type\": \"HowToTool\", \"name\": \"SimplyWise Cost Estimator app\"}\n  ],\n  \"step\": [\n    {\"@type\": \"HowToStep\", \"position\": 1, \"name\": \"Wall area\", \"text\": \"Perimeter is 12 plus 15 plus 12 plus 15, which equals 54 ft. 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Round up to 1 gallon of flat ceiling paint.\"},\n    {\"@type\": \"HowToStep\", \"position\": 5, \"name\": \"Trim and door\", \"text\": \"About 94 linear ft of trim plus one door, at 350 to 400 linear ft per gallon for two coats, is well under a gallon. Buy 1 gallon of trim enamel for the trim and both door faces.\"},\n    {\"@type\": \"HowToStep\", \"position\": 6, \"name\": \"Shopping list\", \"text\": \"The calculator outputs 3 gallons of wall paint, 2 of primer, 1 of ceiling paint, and 1 of trim enamel. That is the full buy for one bedroom with no return trip, because every line rounded up.\"}\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\": \"Question\", \"name\": \"How do you calculate how many gallons of paint you need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use one formula. 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Check the technical data sheet for the product on hand.\"}},\n    {\"@type\": \"Question\", \"name\": \"How do you find wall area for the calculator?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Wall area equals the room perimeter times the ceiling height. Add the length of all walls to get the perimeter, then multiply by the height in feet. A 12 ft by 15 ft room has a 54 ft perimeter. At an 8 ft ceiling that is 432 sq ft of gross wall area. For L-shaped rooms, measure each wall run individually and sum the lengths.\"}},\n    {\"@type\": \"Question\", \"name\": \"Should the calculator use one coat or two?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Two coats for almost every residential repaint. Color changes, going lighter, painting over stains or repairs, and warranty exposure all push scope to two finish coats. Use three coats on dark-to-white changes and on bright reds or yellows. Single-coat pricing is reserved for a same-color refresh on premium paint over a clean surface.\"}},\n    {\"@type\": \"Question\", \"name\": \"Do I subtract doors and windows from wall area?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Only when total openings exceed about 15 percent of the wall area. Cutting in around the trim eats the surface area you would have saved. A standard interior door is about 20 sq ft and a typical window about 15 sq ft. On a room with a wall of windows or large patio doors, deduct the actual opening area and quote the trim cutting-in as its own labor line.\"}},\n    {\"@type\": \"Question\", \"name\": \"Does the calculator include primer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Primer is its own line, not part of the finish-paint math. Add a primer line on bare drywall, bare wood, patched repairs, stained surfaces, and dramatic color changes. Primer covers less than finish paint at 200 to 300 sq ft per gallon, so size it on the same wall area at the lower rate. You can skip a dedicated primer coat when repainting a clean, similar-color surface with a self-priming paint.\"}},\n    {\"@type\": \"Question\", \"name\": \"How do you calculate ceiling and trim paint separately?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Ceiling area equals room length times width, at 350 to 400 sq ft per gallon of flat ceiling paint. Trim is measured in linear feet and converts at about 350 to 400 linear ft of standard 3-inch trim per gallon of enamel. A 12 ft by 15 ft room has a 180 sq ft ceiling and roughly 94 linear ft of trim. Each uses a different product and unit, so never lump them into the wall line.\"}},\n    {\"@type\": \"Question\", \"name\": \"Can I price a paint job from a photo?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. SimplyWise Cost Estimator turns a photo of the wall, ceiling, or trim into an itemized estimate in about 6 seconds, with material quantities. Add the room measurements in the project description. Every line item carries unit, quantity, and price, so you can edit any material, labor, or fee line before you send it. On Pro iPhones, a LiDAR room scan captures measurements.\"}},\n    {\"@type\": \"Question\", \"name\": \"How much does SimplyWise Cost Estimator cost?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"SimplyWise Cost Estimator is $29.99\/mo, or $239.99\/yr, which works out to about $20\/mo on annual. Every plan starts with a 7-day free trial. The plan covers photo to itemized estimate with material quantities, live material pricing, LiDAR room scans on Pro iPhones, and professional branded quotes the client signs to approve.\"}}\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"itemListElement\": [\n    {\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Blog\", \"item\": \"https:\/\/simplywise.com\/blog\/\"},\n    {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Painting\", \"item\": \"https:\/\/simplywise.com\/blog\/category\/painting\/\"},\n    {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Paint Coverage Calculator: Square Feet to Gallons\", \"item\": \"https:\/\/simplywise.com\/blog\/paint-coverage-calculator-sq-ft-to-gallons\/\"}\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Blog &nbsp;&rsaquo;&nbsp; Painting &nbsp;&rsaquo;&nbsp; Paint Coverage Calculator Painting &middot; Coverage Calculator Paint Coverage Calculator: Square Feet to Gallons A field-tested paint coverage calculator that turns square feet into gallons: wall area, coverage rate per gallon, number of coats, primer, and trim, with a worked example. In a hurry? Price a job from a photo in [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"paint coverage calculator","_yoast_wpseo_title":"Paint Coverage Calculator: Sq Ft to Gallons","_yoast_wpseo_metadesc":"Paint coverage calculator for contractors: wall-area math, gallons per coat, primer, and a square-feet-to-gallons reference table with a worked example.","_yoast_wpseo_linkdex":"73","_yoast_wpseo_content_score":"90","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[177],"tags":[],"class_list":["post-6819","post","type-post","status-publish","format-standard","hentry","category-free-templates"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Paint Coverage Calculator: Sq Ft to 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