{"id":10335,"date":"2026-10-14T09:00:00","date_gmt":"2026-10-14T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=10335"},"modified":"2026-10-14T15:46:59","modified_gmt":"2026-10-14T15:46:59","slug":"roof-area-calculator","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/roof-area-calculator\/","title":{"rendered":"Roof Area Calculator: Square Footage and Roofing Squares"},"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    el = el.parentElement;\n  }\n  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h2{font-size:30px;}.pm__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=\"pm\">\n<header class=\"pm__hero\">\n<div class=\"pm__inner\">\n<nav class=\"pm__crumb\">Blog &nbsp;&rsaquo;&nbsp; Construction Calculators<\/nav>\n<p><span class=\"pm__eyebrow\">Contractor Calculator &middot; Roofing<\/span><\/p>\n<h1>Roof Area Calculator: Square Footage and Roofing Squares<\/h1>\n<p class=\"pm__dek\">Roof area is your footprint times a pitch multiplier. Enter the footprint and pitch and the roofing squares update as you type.<\/p>\n<div class=\"pm__hero-cta\"><a class=\"pm__btn\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator free<\/a><span class=\"pm__hero-cta-note\">Free to try. Photo into an itemized estimate in about 6 seconds.<\/span><\/div>\n<div class=\"pm__rating\"><span class=\"pm__stars\">&#9733;&#9733;&#9733;&#9733;&#9733;<\/span> <b>4.8<\/b> <span class=\"pm__rating-sub\">on the App Store for SimplyWise Cost Estimator<\/span><\/div>\n<div class=\"pm__meta\">\n<span>SimplyWise<\/span><br \/>\n<i><\/i><br \/>\n<span>Updated October 14, 2026<\/span><br \/>\n<i><\/i><br \/>\n<span>5 min read<\/span>\n<\/div>\n<style id=\"rac-style\">.rac{background:#fff;border:1px solid #dbe6ff;border-radius:18px;box-shadow:0 8px 30px rgba(16,24,40,.10);padding:26px 26px 20px;margin:34px auto 4px;max-width:720px;text-align:left;}.rac__kicker{display:inline-flex;align-items:center;gap:7px;font:700 11px Inter;letter-spacing:.09em;text-transform:uppercase;color:#2563eb;}.rac__kicker::before{content:\"\";width:6px;height:6px;border-radius:50%;background:#2563eb;}.rac h3.rac__title{font:800 21px\/1.2 Inter;color:#111827;letter-spacing:-.02em;margin:7px 0 18px;}.rac__lede{font:500 13px Inter;color:#6b7280;margin:-10px 0 16px;}.rac__grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;}.rac__field{margin:0 0 14px;}.rac__field label{display:block;font:600 12.5px Inter;color:#6b7280;margin-bottom:6px;}.rac input{width:100%;padding:12px 14px;border:1.5px solid #e5e7eb;border-radius:10px;font:600 16px Inter;color:#111827;background:#fbfcfe;outline:none;transition:border-color .15s ease,box-shadow .15s ease;appearance:textfield;-moz-appearance:textfield;}.rac input::-webkit-outer-spin-button,.rac input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0;}.rac input:focus{border-color:#2563eb;background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.12);}.rac__presets{display:flex;gap:8px;flex-wrap:wrap;}.rac__preset{flex:1;min-width:80px;padding:11px 0;border:1.5px solid #e5e7eb;border-radius:10px;background:#fff;font:600 14.5px Inter;color:#4b5563;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease;}.rac__preset.is-on{background:#eff4ff;border-color:#2563eb;color:#2563eb;}.rac__hint{display:block;font:500 11.5px Inter;color:#9ca3af;margin-top:5px;}.rac__out{background:linear-gradient(180deg,#f0f5ff,#eef4ff);border:1px solid #dbe6ff;border-radius:14px;padding:20px 22px 13px;margin-top:4px;}.rac__big{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;border-bottom:1px solid #dbe6ff;padding-bottom:14px;margin-bottom:4px;}.rac__num{font:800 44px\/1 Inter;color:#2563eb;letter-spacing:-.03em;font-variant-numeric:tabular-nums;}.rac__unit{font:600 15px Inter;color:#4b5563;}.rac__row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:10px 0;border-bottom:1px solid rgba(219,230,255,.75);font:500 14.5px Inter;color:#6b7280;}.rac__row b{color:#111827;font-weight:700;font-variant-numeric:tabular-nums;text-align:right;}.rac__row--last{border-bottom:none;}.rac__note{font:500 12px\/1.55 Inter;color:#9ca3af;margin:6px 0 4px;}@media(max-width:600px){.rac{padding:20px 16px 14px;border-radius:16px;margin-top:22px;}.rac__grid{gap:10px;}.rac__num{font-size:38px;}.rac__preset{padding:12px 0;}}<\/style>\n<div class=\"rac\" id=\"raccalc\">\n<span class=\"rac__kicker\">Free Roof Area Calculator<\/span><\/p>\n<h3 class=\"rac__title\">Roof area and roofing squares<\/h3>\n<p class=\"rac__lede\">Enter your numbers below.<\/p>\n<div class=\"rac__field\"><label>Footprint entry<\/label><\/p>\n<div class=\"rac__presets\" id=\"rac-mode\"><button class=\"rac__preset is-on\" data-m=\"lw\" type=\"button\">Length x width<\/button><button class=\"rac__preset\" data-m=\"sf\" type=\"button\">Total square feet<\/button><\/div>\n<p><span class=\"rac__hint\">Pick one.<\/span><\/div>\n<div id=\"rac-lw\">\n<div class=\"rac__grid\">\n<div class=\"rac__field\"><label for=\"rac-len\">Length (ft)<\/label><input id=\"rac-len\" inputmode=\"decimal\" max=\"500\" min=\"1\" step=\"0.5\" type=\"number\" value=\"40\"\/><\/div>\n<div class=\"rac__field\"><label for=\"rac-wid\">Width (ft)<\/label><input id=\"rac-wid\" inputmode=\"decimal\" max=\"500\" min=\"1\" step=\"0.5\" type=\"number\" value=\"30\"\/><\/div>\n<\/div>\n<div class=\"rac__field\"><label for=\"rac-overhang\">Overhang per side (in, optional)<\/label><input id=\"rac-overhang\" inputmode=\"decimal\" max=\"36\" min=\"0\" step=\"1\" type=\"number\" value=\"0\"\/><span class=\"rac__hint\">Adds to each side before the pitch multiplier.<\/span><\/div>\n<\/div>\n<div id=\"rac-sf\" style=\"display:none\">\n<div class=\"rac__field\"><label for=\"rac-area-in\">Total sq ft<\/label><input id=\"rac-area-in\" inputmode=\"decimal\" max=\"200000\" min=\"1\" step=\"1\" type=\"number\" value=\"1200\"\/><span class=\"rac__hint\">Overhang does not apply in this mode.<\/span><\/div>\n<\/div>\n<div class=\"rac__field\"><label>Roof pitch entry<\/label><\/p>\n<div class=\"rac__presets\" id=\"rac-pitch-mode\"><button class=\"rac__preset is-on\" data-p=\"rise\" type=\"button\">Rise over 12<\/button><button class=\"rac__preset\" data-p=\"deg\" type=\"button\">Degrees<\/button><\/div>\n<p><span class=\"rac__hint\">Pick one.<\/span><\/div>\n<div id=\"rac-rise-wrap\">\n<div class=\"rac__field\"><label>Common pitches<\/label><\/p>\n<div class=\"rac__presets\" id=\"rac-pitch-presets\"><button class=\"rac__preset\" data-r=\"4\" type=\"button\">4\/12<\/button><button class=\"rac__preset is-on\" data-r=\"6\" type=\"button\">6\/12<\/button><button class=\"rac__preset\" data-r=\"9\" type=\"button\">9\/12<\/button><button class=\"rac__preset\" data-r=\"12\" type=\"button\">12\/12<\/button><\/div>\n<\/div>\n<div class=\"rac__field\"><label for=\"rac-rise\">Rise (inches per 12 in run)<\/label><input id=\"rac-rise\" inputmode=\"decimal\" max=\"24\" min=\"0\" step=\"0.5\" type=\"number\" value=\"6\"\/><span class=\"rac__hint\">Use 0 for a flat roof.<\/span><\/div>\n<\/div>\n<div id=\"rac-deg-wrap\" style=\"display:none\">\n<div class=\"rac__field\"><label for=\"rac-deg\">Roof pitch (degrees)<\/label><input id=\"rac-deg\" inputmode=\"decimal\" max=\"89\" min=\"0\" step=\"0.5\" type=\"number\" value=\"30\"\/><span class=\"rac__hint\">Angle from horizontal.<\/span><\/div>\n<\/div>\n<div class=\"rac__field\"><label>Waste factor<\/label><\/p>\n<div class=\"rac__presets\" id=\"rac-wastes\"><button class=\"rac__preset is-on\" data-v=\"10\" type=\"button\">10 percent<\/button><button class=\"rac__preset\" data-v=\"15\" type=\"button\">15 percent<\/button><button class=\"rac__preset\" data-v=\"20\" type=\"button\">20 percent<\/button><\/div>\n<p><span class=\"rac__hint\">10 for a simple gable, 15 to 20 for hips and cuts.<\/span><input aria-label=\"Waste factor percent\" id=\"rac-waste\" inputmode=\"decimal\" max=\"50\" min=\"0\" step=\"1\" type=\"number\" value=\"10\"\/><\/div>\n<div aria-live=\"polite\" class=\"rac__out\">\n<div class=\"rac__big\"><span class=\"rac__num\" id=\"rac-squares\">15<\/span><span class=\"rac__unit\" id=\"rac-squares-unit\">roofing squares (100 sq ft each), waste included.<\/span><\/div>\n<div class=\"rac__row\"><span>Roof surface area<\/span><b id=\"rac-area\">1341.64 sq ft<\/b><\/div>\n<div class=\"rac__row\"><span>Footprint area used<\/span><b id=\"rac-footprint\">1200 sq ft<\/b><\/div>\n<div class=\"rac__row rac__row--last\"><span>Pitch multiplier<\/span><b id=\"rac-multiplier\">1.118x<\/b><\/div>\n<\/div>\n<p class=\"rac__note\">Roofing squares always round up. The pitch multiplier is geometry, not a sourced statistic.<\/p>\n<\/div>\n<p><script>\n(function(){\n  \/\/ GEOMETRY, not a sourced claim: multiplier = sqrt(1 + (rise\/12)^2), or 1\/cos(degrees)\n  \/\/ for a pitch entered in degrees. Both forms are the same right-triangle relationship\n  \/\/ (run 12, rise as given) and agree exactly at 45 degrees \/ 12-in-12 pitch.\n  \/\/ Waste factor presets (10 \/ 15 \/ 20 percent) and the common-pitch presets are editorial\n  \/\/ builder guidance, not cited statistics, same treatment as the plywood calculator's\n  \/\/ waste presets.\n  \/\/ NO shingle bundle count ships anywhere on this page. GAF's product pages return HTTP 403\n  \/\/ to this project's fetchers. Owens Corning's shingle listing page (HTTP 200) embeds bundle\n  \/\/ counts of 3 to 6 per square depending on shingle line, with no single figure that applies\n  \/\/ across products, so no universal bundle-per-square count clears the sourcing bar. Omitted\n  \/\/ rather than guessed; see sources.md.\n  function $(i){return document.getElementById(i);}\n  function ceil6(x){return Math.ceil(Number(x.toFixed(6)));}\n  function fmt2(n){var s=n.toFixed(2);if(s.indexOf('.')>=0){s=s.replace(\/\\.?0+$\/,'');}return s;}\n  function fmt4(n){var s=n.toFixed(4);if(s.indexOf('.')>=0){s=s.replace(\/\\.?0+$\/,'');}return s;}\n  function comma(n){return String(n).replace(\/\\B(?=(\\d{3})+(?!\\d))\/g,',');}\n  function val(el,lo,hi){var v=parseFloat(el.value);if(!isFinite(v)||v<lo||v>hi){return null;}return v;}\n  var footprintMode='lw', pitchMode='rise';\n  function blank(){\n    $('rac-squares').textContent='0';\n    $('rac-squares-unit').textContent='enter the footprint to calculate';\n    $('rac-area').textContent='0 sq ft';\n    $('rac-footprint').textContent='0 sq ft';\n    $('rac-multiplier').textContent='enter the footprint above';\n  }\n  function run(){\n    var footprint;\n    if(footprintMode==='lw'){\n      var L=val($('rac-len'),0.5,1000), W=val($('rac-wid'),0.5,1000);\n      if(L===null||W===null){blank();return;}\n      var oh=val($('rac-overhang'),0,60); if(oh===null){oh=0;}\n      var ohFt=oh\/12;\n      footprint=(L+2*ohFt)*(W+2*ohFt);\n    }else{\n      footprint=val($('rac-area-in'),1,300000);\n      if(footprint===null){blank();return;}\n    }\n    var mult;\n    if(pitchMode==='rise'){\n      var rise=val($('rac-rise'),0,36); if(rise===null){rise=0;}\n      mult=Math.sqrt(1+Math.pow(rise\/12,2));\n    }else{\n      var deg=val($('rac-deg'),0,89); if(deg===null){deg=0;}\n      mult=1\/Math.cos(deg*Math.PI\/180);\n    }\n    var waste=val($('rac-waste'),0,100); if(waste===null){waste=0;}\n    var roofArea=footprint*mult;\n    var squaresRaw=(roofArea*(1+waste\/100))\/100;\n    var squares=ceil6(squaresRaw);\n    $('rac-squares').textContent=comma(squares);\n    $('rac-squares-unit').textContent='roofing squares (100 sq ft each), waste included.';\n    $('rac-area').textContent=fmt2(roofArea)+' sq ft';\n    $('rac-footprint').textContent=fmt2(footprint)+' sq ft';\n    $('rac-multiplier').textContent=fmt4(mult)+'x';\n  }\n  ['rac-len','rac-wid','rac-overhang','rac-area-in','rac-rise','rac-deg','rac-waste'].forEach(function(i){$(i).addEventListener('input',run);});\n  var mb=document.querySelectorAll('#rac-mode .rac__preset');\n  mb.forEach(function(b){b.addEventListener('click',function(){\n    footprintMode=b.getAttribute('data-m');\n    mb.forEach(function(x){x.classList.remove('is-on');});\n    b.classList.add('is-on');\n    $('rac-lw').style.display=(footprintMode==='lw')?'':'none';\n    $('rac-sf').style.display=(footprintMode==='sf')?'':'none';\n    run();\n  });});\n  var pmb=document.querySelectorAll('#rac-pitch-mode .rac__preset');\n  pmb.forEach(function(b){b.addEventListener('click',function(){\n    pitchMode=b.getAttribute('data-p');\n    pmb.forEach(function(x){x.classList.remove('is-on');});\n    b.classList.add('is-on');\n    $('rac-rise-wrap').style.display=(pitchMode==='rise')?'':'none';\n    $('rac-deg-wrap').style.display=(pitchMode==='deg')?'':'none';\n    run();\n  });});\n  var ppb=document.querySelectorAll('#rac-pitch-presets .rac__preset');\n  ppb.forEach(function(b){b.addEventListener('click',function(){\n    $('rac-rise').value=b.getAttribute('data-r');\n    ppb.forEach(function(x){x.classList.remove('is-on');});\n    b.classList.add('is-on');\n    run();\n  });});\n  $('rac-rise').addEventListener('input',function(){ppb.forEach(function(x){x.classList.remove('is-on');});});\n  var wb=document.querySelectorAll('#rac-wastes .rac__preset');\n  wb.forEach(function(b){b.addEventListener('click',function(){\n    $('rac-waste').value=b.getAttribute('data-v');\n    wb.forEach(function(x){x.classList.remove('is-on');});\n    b.classList.add('is-on');\n    run();\n  });});\n  $('rac-waste').addEventListener('input',function(){wb.forEach(function(x){x.classList.remove('is-on');});});\n  run();\n})();\n<\/script><\/p>\n<figure class=\"pm__fig\">\n<img decoding=\"async\" alt=\"Top down aerial view of a pitched roof on a house, the kind of roof plane a roof area calculator has to size before the crew loads material\" loading=\"eager\" src=\"https:\/\/images.unsplash.com\/photo-1565041931867-a1c38590a633?w=1400&amp;h=700&amp;fit=crop&amp;q=80&amp;auto=format\"\/><br \/>\n<\/figure>\n<\/div>\n<\/header>\n<div class=\"pm__body\">\n<div class=\"pm__inner\">\n<aside class=\"pm__tldr\">\n<div class=\"pm__tldr-label\">Roof area calculator, at a glance<\/div>\n<ol>\n<li>1,200 sq ft at 6\/12 pitch equals 1,341.64 sq ft, about 15 squares.<\/li>\n<li>Multiplier equals the square root of 1 plus rise over 12, squared. A flat roof (rise 0) is 1.000.<\/li>\n<li>A roofing square is 100 sq ft. Roofers order material by the square, not the raw square footage.<\/li>\n<li>Overhang adds to each side of the footprint before the pitch multiplier, if entered.<\/li>\n<li>Squares always round up. You cannot order a fraction of a square.<\/li>\n<li>Use 10 percent waste on a simple gable, 15 to 20 for hips and cut-up roofs.<\/li>\n<\/ol>\n<div class=\"pm__tldr-cta\"><span>Pricing the whole roofing job?<\/span><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise, free<\/a><\/div>\n<\/aside>\n<h2>How do I calculate roof area from a building footprint?<\/h2>\n<p>Multiply your building footprint by the pitch multiplier for your roof. This roof area calculator takes your length and width, or a square footage, adds overhang, then multiplies by a pitch factor.<\/p>\n<p>A flat footprint of 1,200 sq ft becomes 1,341.64 sq ft of roof surface at a 6\/12 pitch. The sloped plane is longer than the flat ground it covers, and the steeper the pitch, the bigger that gap gets.<\/p>\n<h2>Roof area calculator: how the pitch multiplier works<\/h2>\n<p>Contractors write roof pitch as rise over a 12-inch run. A 6\/12 roof climbs 6 inches for every 12 inches it runs.<\/p>\n<p>The pitch multiplier is the square root of 1 plus the rise over 12, squared. In degrees, the multiplier equals 1 divided by the cosine of that angle. Both forms give the same number for the same roof. A 12 over 12 pitch, for example, is 45 degrees, and both return 1.414.<\/p>\n<table class=\"pm__table\">\n<thead>\n<tr>\n<th scope=\"col\">Roof pitch<\/th>\n<th scope=\"col\">Multiplier<\/th>\n<th scope=\"col\">Common on<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>4 over 12<\/td>\n<td>1.054<\/td>\n<td>Lower-pitch ranch and modern builds<\/td>\n<\/tr>\n<tr>\n<td>6 over 12<\/td>\n<td>1.118<\/td>\n<td>A mid-range residential pitch<\/td>\n<\/tr>\n<tr>\n<td>9 over 12<\/td>\n<td>1.250<\/td>\n<td>Steeper residential roofs<\/td>\n<\/tr>\n<tr>\n<td>12 over 12<\/td>\n<td>1.414<\/td>\n<td>Steep-slope roofs at 45 degrees<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>This table is plain geometry, not a sourced statistic. A flat roof (rise 0) multiplies at exactly 1.000.<\/p>\n<p class=\"pm__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Turn a job-site photo into an itemized estimate, free &rarr;<\/a><\/p>\n<h2>Roof area calculator: measure it, size it, calculate<\/h2>\n<ol class=\"pm__steps\">\n<li>\n<h3>Measure your building footprint<\/h3>\n<p>Enter length and width, or a total square footage, for the flat ground area under the roof.<\/p>\n<\/li>\n<li>\n<h3>Add overhang if you want the true roof edge<\/h3>\n<p>Overhang adds to each side of the footprint before the pitch multiplier is applied. Leave it at 0 to size the building footprint only.<\/p>\n<\/li>\n<li>\n<h3>Enter your roof pitch<\/h3>\n<p>Use rise over 12 if you know the pitch, or switch to degrees if that is how it was measured.<\/p>\n<\/li>\n<li>\n<h3>Add a waste factor for the squares you need<\/h3>\n<p>10 percent covers a simple gable. Move to 15 or 20 percent for hips, valleys, and heavy cutting.<\/p>\n<\/li>\n<\/ol>\n<h2>Roofing squares: what contractors order<\/h2>\n<p>A roofing square is 100 sq ft, the unit suppliers and crews price and order by, not the raw square footage. Divide total roof area by 100 and round up. A 1,341.64 sq ft roof needs 14 squares before waste, 15 once a 10 percent waste factor covers cuts.<\/p>\n<div class=\"pm__callout\"><strong>Bundle counts vary.<\/strong> Shingle bundle counts run from 3 to 6 bundles per square by product line. Check the count on the product&#8217;s own packaging.<\/div>\n<h2>SimplyWise Cost Estimator for roofing takeoffs<\/h2>\n<section class=\"pm__promo\">\n<p>SimplyWise Cost Estimator turns a job-site photo into an itemized estimate in about 6 seconds. Material, labor, and fee lines are editable, so your roof area calculator square count and waste factor drop straight into a quote the client signs to approve. It is $29.99\/mo or $239.99\/yr, about $20\/mo on annual, with a 7-day free trial.<\/p>\n<p><a class=\"pm__btn\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><br \/>\n<\/section>\n<h2>Keep reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/construction-calculators\/\">Construction Calculators<\/a>: every free takeoff calculator in one hub.<\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/roof-pitch-calculator\/\">Roof Pitch Calculator<\/a>: already know your area and need the pitch and multiplier.<\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/metal-roof-cost-calculator\/\">Metal Roof Cost Calculator<\/a>: panels, trim, and material cost.<\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/roof-replacement-cost\/\">Roof Replacement Cost<\/a>: full tear-off and install pricing.<\/li>\n<\/ul>\n<div class=\"pm__sources\">\n<h2>Sources<\/h2>\n<h3>Pitch multiplier and roofing square<\/h3>\n<ul>\n<li>Plain geometry. Multiplier equals the square root of 1 plus the rise over 12, squared, same as 1 divided by the cosine of the pitch angle in degrees.<\/li>\n<li>A roofing square is a fixed unit of 100 sq ft, standard across roofing pricing.<\/li>\n<\/ul>\n<h3>Shingle bundle count (checked, not used)<\/h3>\n<ul>\n<li>GAF&#8217;s shingle product pages could not be read on September 25, 2026.<\/li>\n<li>Owens Corning&#8217;s shingle listing, read September 25, 2026, lists 3 to 6 bundles per square depending on the shingle line, so no single bundle count ships here.<\/li>\n<\/ul>\n<h3>SimplyWise product facts<\/h3>\n<ul>\n<li><a href=\"https:\/\/apps.apple.com\/us\/app\/simplywise-cost-estimator\/id6670619664\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator on the App Store<\/a>, 4.8 rating.<\/li>\n<li>Pricing and the photo-to-estimate claim: <a href=\"https:\/\/www.simplywise.com\/blog\/pricing\/\" rel=\"noopener\" target=\"_blank\">SimplyWise pricing<\/a> and the <a href=\"https:\/\/www.simplywise.com\/blog\/simplywise-cost-estimator-faqs\/\" rel=\"noopener\" target=\"_blank\">Cost Estimator FAQs<\/a>.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<section class=\"pm__faq\">\n<div class=\"pm__inner\">\n<h2>Frequently asked questions about the roof area calculator<\/h2>\n<h3 class=\"pm__faq-cat\">Area and roofing squares<\/h3>\n<details>\n<summary>How do I calculate the area of my roof?<\/summary>\n<div>\n<p>Use a roof area calculator: multiply your building footprint by the pitch multiplier for your roof&#8217;s slope. A 1,200 sq ft footprint at a 6 over 12 pitch works out to 1,341.64 sq ft of roof surface.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is a roofing square?<\/summary>\n<div>\n<p>A roofing square is 100 sq ft, a fixed unit suppliers and most crews order material by. Divide your total roof area by 100 and round up.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"pm__faq-cat\">Pitch and overhang<\/h3>\n<details>\n<summary>How does roof pitch affect the total area?<\/summary>\n<div>\n<p>A steeper pitch multiplies the footprint by a bigger factor. A flat roof (rise 0) has a multiplier of exactly 1.000. A 12 over 12 pitch, which is 45 degrees, multiplies the footprint by 1.414.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Do I need to account for roof overhang?<\/summary>\n<div>\n<p>Overhang adds to each side of the footprint before the pitch multiplier, so enter it if your roof edge extends past the wall line. Leave it at 0 for the building footprint only.<\/p>\n<\/div>\n<\/details>\n<h3 class=\"pm__faq-cat\">Measuring and estimating<\/h3>\n<details>\n<summary>Can I measure my roof with my phone camera instead of climbing up?<\/summary>\n<div>\n<p>Enter your footprint and pitch above rather than climbing onto the roof. SimplyWise Cost Estimator then turns a job-site photo into an itemized estimate in about 6 seconds. On a Pro iPhone, the room scan captures interior measurements with LiDAR.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Does SimplyWise Cost Estimator handle roofing takeoffs?<\/summary>\n<div>\n<p>It builds material, labor, and fee line items, each with unit, quantity, and price per unit. Your square count drops into a branded quote the client signs to approve. Pricing is $29.99\/mo or $239.99\/yr, with a 7-day free trial.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/section>\n<section class=\"pm__final\">\n<div class=\"pm__inner\">\n<span class=\"pm__eyebrow\">Get the square count right<\/span><\/p>\n<h2>Turn a roof area calculation into a bid that holds margin.<\/h2>\n<p>Snap a photo and get an itemized estimate with editable lines before you order material. Free to try, then $29.99\/mo or $239.99\/yr after a 7-day trial.<\/p>\n<p><a class=\"pm__btn pm__btn--lg\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise, free<\/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\": \"Roof Area Calculator: Square Footage and Roofing Squares\",\n  \"description\": \"A roof area calculator that turns your building footprint and roof pitch into total roof surface area and roofing squares needed, overhang and waste factor included.\",\n  \"author\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\"},\n  \"publisher\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\", \"logo\": {\"@type\": \"ImageObject\", \"url\": \"https:\/\/www.simplywise.com\/icon-512x512.png\"}, \"sameAs\": [\"https:\/\/www.crunchbase.com\/organization\/simplywise\"] },\n  \"datePublished\": \"2026-10-14\",\n  \"dateModified\": \"2026-10-14\",\n  \"mainEntityOfPage\": \"https:\/\/www.simplywise.com\/blog\/roof-area-calculator\/\",\n  \"image\": \"https:\/\/images.unsplash.com\/photo-1565041931867-a1c38590a633?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 use the roof area calculator\",\n  \"step\": [\n    {\"@type\": \"HowToStep\", \"position\": 1, \"name\": \"Measure your building footprint\", \"text\": \"Enter length and width, or a total square footage, for the flat ground area under the roof.\"},\n    {\"@type\": \"HowToStep\", \"position\": 2, \"name\": \"Add overhang if you want the true roof edge\", \"text\": \"Overhang adds to each side of the footprint before the pitch multiplier is applied. Leave it at 0 to size the building footprint only.\"},\n    {\"@type\": \"HowToStep\", \"position\": 3, \"name\": \"Enter your roof pitch\", \"text\": \"Use rise over 12 if you know the pitch, or switch to degrees if that is how it was measured.\"},\n    {\"@type\": \"HowToStep\", \"position\": 4, \"name\": \"Add a waste factor for the squares you need\", \"text\": \"10 percent covers a simple gable. Move to 15 or 20 percent for hips, valleys, and heavy cutting.\"}\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 I calculate the area of my roof?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use a roof area calculator: multiply your building footprint by the pitch multiplier for your roof's slope. 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Leave it at 0 for the building footprint only.\"}},\n    {\"@type\": \"Question\", \"name\": \"Can I measure my roof with my phone camera instead of climbing up?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Enter your footprint and pitch above rather than climbing onto the roof. SimplyWise Cost Estimator then turns a job-site photo into an itemized estimate in about 6 seconds. On a Pro iPhone, the room scan captures interior measurements with LiDAR.\"}},\n    {\"@type\": \"Question\", \"name\": \"Does SimplyWise Cost Estimator handle roofing takeoffs?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It builds material, labor, and fee line items, each with unit, quantity, and price per unit. Your square count drops into a branded quote the client signs to approve. Pricing is $29.99\/mo or $239.99\/yr, with a 7-day free trial.\"}}\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\": \"Home\", \"item\": \"https:\/\/www.simplywise.com\/\"},\n    {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Blog\", \"item\": \"https:\/\/www.simplywise.com\/blog\/\"},\n    {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Construction Calculators\", \"item\": \"https:\/\/www.simplywise.com\/blog\/construction-calculators\/\"},\n    {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Roof Area Calculator\", \"item\": \"https:\/\/www.simplywise.com\/blog\/roof-area-calculator\/\"}\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Blog &nbsp;&rsaquo;&nbsp; Construction Calculators Contractor Calculator &middot; Roofing Roof Area Calculator: Square Footage and Roofing Squares Roof area is your footprint times a pitch multiplier. Enter the footprint and pitch and the roofing squares update as you type. Try SimplyWise Cost Estimator freeFree to try. Photo into an itemized estimate in about 6 seconds. &#9733;&#9733;&#9733;&#9733;&#9733; [&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":"roof area calculator","_yoast_wpseo_title":"Roof Area Calculator: Square Footage and Roofing Squares","_yoast_wpseo_metadesc":"A roof area calculator that turns building footprint and roof pitch into total roof surface area and roofing squares, overhang and waste factor included.","_yoast_wpseo_linkdex":"78","_yoast_wpseo_content_score":"90","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[181],"tags":[],"class_list":["post-10335","post","type-post","status-publish","format-standard","hentry","category-how-to-estimate"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Roof Area Calculator: Square Footage and Roofing Squares<\/title>\n<meta name=\"description\" content=\"A roof area calculator that turns building footprint and roof pitch into total roof surface area and roofing squares, overhang and waste factor included.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.simplywise.com\/blog\/roof-area-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Roof Area Calculator: Square Footage and Roofing Squares\" \/>\n<meta property=\"og:description\" content=\"A roof area calculator that turns building footprint and roof pitch into total roof surface area and roofing squares, overhang and waste factor included.\" \/>\n<meta property=\"og:url\" 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