{"id":9454,"date":"2026-09-16T09:00:00","date_gmt":"2026-09-16T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=9454"},"modified":"2026-10-27T05:29:35","modified_gmt":"2026-10-27T05:29:35","slug":"roof-pitch-calculator","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/roof-pitch-calculator\/","title":{"rendered":"Roof Pitch Calculator"},"content":{"rendered":"<div class=\"rv2\">\n<div class=\"rv-site-header\">\n<div class=\"rv-header-in\"><a class=\"rv-brand\" href=\"https:\/\/www.simplywise.com\/\" aria-label=\"SimplyWise home\"><span class=\"rv-bgi\" role=\"img\" aria-label=\"SimplyWise\" style=\"background-image:url('https:\/\/www.simplywise.com\/static-pages\/static\/main-landing-page\/assets\/brand\/wordmark-navy.svg');aspect-ratio:546\/87\"><\/span><\/a><\/p>\n<nav class=\"rv-top-nav\" aria-label=\"Apps\">\n<ul>\n<li><a class=\"rv-tn\" href=\"https:\/\/www.simplywise.com\/#ch-estimates\"><span class=\"rv-bgi rv-tn-ic\" 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.rv-bgi{display:block;background-position:center;background-size:contain;background-repeat:no-repeat}.rv2 .rv-brand .rv-bgi{width:124px}@media (min-width:768px){.rv2 .rv-brand .rv-bgi{width:136px}}@media (min-width:1024px){.rv2 .rv-brand .rv-bgi{width:142px}}.rv2 .sw-c div[style*=\"display:flex\"]>br,.rv2 .sw-t div[style*=\"display:flex\"]>br{display:none !important}.rv2 .sw-c h1,.rv2 .sw-t h1{font-size:clamp(34px,11.2vw,52px) !important;line-height:1.02 !important;letter-spacing:-.045em !important}@media (min-width:1024px){.rv2 .sw-c h1,.rv2 .sw-t h1{font-size:52px !important;letter-spacing:-.05em !important}}@media (max-width:767px){.rv2 .sw-c section:first-of-type a[style*=\"border-radius:999px\"]:not([href*=\"preferences\/source\"]),.rv2 .sw-t section:first-of-type a[style*=\"border-radius:999px\"]:not([href*=\"preferences\/source\"]){display:flex !important;width:100% !important;justify-content:center !important;box-sizing:border-box !important;min-height:52px}}<\/style>\n<article class=\"pm\">\n<header class=\"pm__hero\">\n<div class=\"pm__inner\">\n<nav class=\"pm__crumb\">Blog &nbsp;&rsaquo;&nbsp; How to Estimate<\/nav>\n<p><span class=\"pm__eyebrow\">Contractor Calculator &middot; Roofing<\/span><\/p>\n<h1><span class=\"rv-h1-a\">Roof Pitch Calculator:<\/span> <span class=\"rv-h1-b\">Pitch, Angle, and Roof Area<\/span><\/h1>\n<p class=\"pm__dek\">Roof pitch is rise over a 12 in run. Set the rise below, or type a measured angle, and the pitch, multiplier, and true roof area update as you type.<\/p>\n<p class=\"pm__dek-cta\">Pricing the whole roof? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Estimate it from a photo<\/a> in about six seconds.<\/p>\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 September 16, 2026<\/span><br \/>\n<i><\/i><br \/>\n<span>5 min read<\/span>\n<\/div>\n<p class=\"pm__prefsrc\" style=\"margin:16px 0 0;\"><a href=\"https:\/\/www.google.com\/preferences\/source?q=simplywise.com\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-flex;align-items:center;gap:8px;min-height:36px;max-width:100%;box-sizing:border-box;padding:6px 14px;background:#fff;border:1px solid #dbe6ff;border-radius:999px;color:#2563eb;font:600 13.5px\/1.3 Inter,-apple-system,sans-serif;text-decoration:none;white-space:nowrap;\"><svg width=\"18\" height=\"18\" viewBox=\"0 0 48 48\" aria-hidden=\"true\" focusable=\"false\" style=\"flex:none\"><path fill=\"#EA4335\" d=\"M24 9.5c3.54 0 6.71 1.22 9.21 3.6l6.85-6.85C35.9 2.38 30.47 0 24 0 14.62 0 6.51 5.38 2.56 13.22l7.98 6.19C12.43 13.72 17.74 9.5 24 9.5z\"\/><path fill=\"#4285F4\" d=\"M46.98 24.55c0-1.57-.15-3.09-.38-4.55H24v9.02h12.94c-.58 2.96-2.26 5.48-4.78 7.18l7.73 6c4.51-4.18 7.09-10.36 7.09-17.65z\"\/><path fill=\"#FBBC05\" d=\"M10.53 28.59c-.48-1.45-.76-2.99-.76-4.59s.27-3.14.76-4.59l-7.98-6.19C.92 16.46 0 20.12 0 24c0 3.88.92 7.54 2.56 10.78l7.97-6.19z\"\/><path fill=\"#34A853\" d=\"M24 48c6.48 0 11.93-2.13 15.89-5.81l-7.73-6c-2.15 1.45-4.92 2.3-8.16 2.3-6.26 0-11.57-4.22-13.47-9.91l-7.98 6.19C6.51 42.62 14.62 48 24 48z\"\/><\/svg>Add SimplyWise as a preferred source<\/a><\/p>\n<div class=\"swc\" id=\"swcalc\">\n<span class=\"swc__kicker\">Free Roof Pitch Calculator<\/span><\/p>\n<div class=\"swc__title\">Set the pitch, get the angle and the real roof area<\/div>\n<div class=\"swc__field\"><label for=\"swc-rise\">Common pitch<\/label><\/p>\n<div class=\"swc__presets\" id=\"swc-presets\"><button type=\"button\" class=\"swc__preset\" data-r=\"4\">4:12<\/button><button type=\"button\" class=\"swc__preset is-on\" data-r=\"6\">6:12<\/button><button type=\"button\" class=\"swc__preset\" data-r=\"8\">8:12<\/button><button type=\"button\" class=\"swc__preset\" data-r=\"12\">12:12<\/button><\/div>\n<\/div>\n<div class=\"swc__grid\">\n<div class=\"swc__field\"><label for=\"swc-rise\">Rise (in)<\/label><input id=\"swc-rise\" type=\"number\" inputmode=\"decimal\" min=\"0\" max=\"240\" step=\"0.25\" value=\"6\"><\/div>\n<div class=\"swc__field\"><label for=\"swc-run\">Run (in)<\/label><input id=\"swc-run\" type=\"number\" inputmode=\"decimal\" min=\"0.25\" max=\"240\" step=\"1\" value=\"12\"><span class=\"swc__hint\">Leave at 12 for a standard pitch<\/span><\/div>\n<\/div>\n<div class=\"swc__grid\">\n<div class=\"swc__field\"><label for=\"swc-ang\">Measured angle (degrees)<\/label><input id=\"swc-ang\" type=\"number\" inputmode=\"decimal\" min=\"0.1\" max=\"89\" step=\"0.1\" placeholder=\"optional\"><span class=\"swc__hint\">Overrides rise and run<\/span><\/div>\n<div class=\"swc__field\"><label for=\"swc-area\">Roof plan area (sq ft)<\/label><input id=\"swc-area\" type=\"number\" inputmode=\"decimal\" min=\"1\" max=\"100000\" step=\"10\" value=\"1600\"><\/div>\n<\/div>\n<div class=\"swc__out\" aria-live=\"polite\">\n<div class=\"swc__big\"><span class=\"swc__num\" id=\"swc-pitch\">6<\/span><span class=\"swc__unit\">in 12 roof pitch<\/span><\/div>\n<div class=\"swc__row\"><span>Slope angle<\/span><b id=\"swc-angle\">26.6 degrees<\/b><\/div>\n<div class=\"swc__row\"><span>Pitch multiplier<\/span><b id=\"swc-mult\">1.118<\/b><\/div>\n<div class=\"swc__row swc__row--cost\"><span>Roof surface area<\/span><b id=\"swc-surface\">1,789 sq ft<\/b><\/div>\n<p class=\"swc__note\" id=\"swc-note\">Standard slope for asphalt shingles, single underlayment, per IRC R905.2.2. Code limits read September 11, 2026.<\/p>\n<\/div>\n<\/div>\n<p><script>\n(function(){\n  \/\/ Pitch, angle and the pitch multiplier are pure geometry, so they carry no\n  \/\/ source. The CODE LIMITS below are sourced data, one block, swap-ready:\n  \/\/ IRC R905.2.2 sets 2:12 as the minimum slope for asphalt shingles and\n  \/\/ requires double underlayment from 2:12 up to 4:12. Read 2026-09-11 from\n  \/\/ two free municipal publications of the code text: City of Seattle,\n  \/\/ 2012 Seattle Residential Code Chapter 9 (seattle.gov) and the Town of\n  \/\/ Windsor Locks CT building department asphalt shingle handout.\n  \/\/ Maker low slope limits agree: TAMKO Elite Glass-Seal data sheet\n  \/\/ (\"2 inches per foot or greater\"), IKO Cambridge technical data sheet\n  \/\/ (\"Never apply asphalt shingles to roof slopes less than 2:12\"),\n  \/\/ CertainTeed Landmark product data (\"slopes greater than 2 in per foot\"),\n  \/\/ all captured 2026-09-11.\n  var LOW_MIN=2, STD_MIN=4;\n  var NOTE_STD='Standard slope for asphalt shingles, single underlayment, per IRC R905.2.2. Code limits read September 11, 2026.';\n  var NOTE_LOW='Low slope. From 2 in 12 up to 4 in 12, IRC R905.2.2 requires double underlayment. Code limits read September 11, 2026.';\n  var NOTE_UNDER='Under the 2 in 12 floor for asphalt shingles in IRC R905.2.2. This roof needs a different covering, a membrane or a metal system. Code limits read September 11, 2026.';\n  function $(i){return document.getElementById(i);}\n  function r6(x){return Number(x.toFixed(6));}\n  function val(el,lo,hi){var v=parseFloat(el.value);if(!isFinite(v)||v<lo||v>hi){return null;}return v;}\n  function trim(s){if(s.indexOf('.')<0){return s;}return s.replace(\/0+$\/,'').replace(\/\\.$\/,'');}\n  function neutral(){\n    $('swc-pitch').textContent='0';\n    $('swc-angle').textContent='enter rise and run';\n    $('swc-mult').textContent='1.000';\n    $('swc-surface').textContent='0 sq ft';\n    $('swc-note').textContent='Enter a rise and a run to see the IRC R905.2.2 slope limits. Code limits read September 11, 2026.';\n  }\n  function run(){\n    var ang=val($('swc-ang'),0.1,89);\n    var ratio, deg;\n    if(ang!==null){\n      ratio=Math.tan(ang*Math.PI\/180);\n      deg=ang;\n    }else{\n      var rise=val($('swc-rise'),0,240), runIn=val($('swc-run'),0.25,240);\n      if(rise===null||runIn===null){neutral();return;}\n      ratio=rise\/runIn;\n      deg=Math.atan(ratio)*180\/Math.PI;\n    }\n    var pitch12=r6(ratio*12);\n    var mult=Math.sqrt(1+ratio*ratio);\n    var area=val($('swc-area'),1,100000);\n    $('swc-pitch').textContent=trim(pitch12.toFixed(2));\n    $('swc-angle').textContent=deg.toFixed(1)+' degrees';\n    $('swc-mult').textContent=mult.toFixed(3);\n    $('swc-surface').textContent=(area===null)?'enter plan area':Math.round(area*mult).toLocaleString('en-US')+' sq ft';\n    $('swc-note').textContent=(pitch12<LOW_MIN)?NOTE_UNDER:((pitch12<STD_MIN)?NOTE_LOW:NOTE_STD);\n  }\n  var pb=document.querySelectorAll('#swc-presets .swc__preset');\n  pb.forEach(function(b){b.addEventListener('click',function(){\n    $('swc-rise').value=b.getAttribute('data-r');\n    $('swc-run').value='12';\n    $('swc-ang').value='';\n    pb.forEach(function(x){x.classList.remove('is-on');});\n    b.classList.add('is-on');\n    run();\n  });});\n  ['swc-rise','swc-run','swc-ang'].forEach(function(i){$(i).addEventListener('input',function(){\n    pb.forEach(function(x){x.classList.remove('is-on');});\n    run();\n  });});\n  $('swc-area').addEventListener('input',run);\n  run();\n})();\n<\/script><\/p>\n<figure class=\"pm__fig\">\n<img decoding=\"async\" alt=\"Wooden roof framing standing against an open sky, the rise over run that sets a roof pitch\" loading=\"eager\" src=\"https:\/\/images.unsplash.com\/photo-1676802540678-2dceb1820113?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\">At a glance<\/div>\n<ol>\n<li>Roof pitch is rise in 12. A roof climbing 6 in over 12 in of run is a 6:12.<\/li>\n<li>Slope angle is the arctangent of rise over run. A 6:12 is 26.6 degrees.<\/li>\n<li>The pitch multiplier is the square root of 1 plus the ratio squared. A 6:12 is 1.118.<\/li>\n<li>Plan area times the multiplier is the real surface you cover.<\/li>\n<li>IRC R905.2.2 sets 2:12 as the shingle floor, with double underlayment below 4:12.<\/li>\n<li>TAMKO, IKO, and CertainTeed publish the same 2:12 floor.<\/li>\n<\/ol>\n<div class=\"pm__tldr-cta\"><span>Turn the squares into a priced, branded quote. Free to try.<\/span><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a><\/div>\n<\/aside>\n<h2>How the roof pitch calculator works<\/h2>\n<p>Pitch is a ratio. Roofers write it as rise in 12, inches of climb for every 12 in of run. Level a square against a rafter, mark 12 in out, and measure straight up.<\/p>\n<p>Two numbers fall out of that ratio. Slope angle is the arctangent of rise over run in degrees. The pitch multiplier is the square root of 1 plus the ratio squared, the hypotenuse of the same triangle.<\/p>\n<p>The multiplier is the one that touches money. A plan draws the roof flat, so plan area is always smaller than the surface you cover.<\/p>\n<h2>Worked example: a 6:12 roof over a 1,600 sq ft footprint<\/h2>\n<p>A 6:12 climbs 6 in over 12 in of run, a ratio of 0.5. The arctangent of 0.5 is <strong>26.6 degrees<\/strong>.<\/p>\n<p>The multiplier is the square root of 1.25, or <strong>1.118<\/strong>. Multiply the 1,600 sq ft footprint by it and the roof surface is <strong>1,789 sq ft<\/strong>, about 189 sq ft more than the plan shows.<\/p>\n<p>Bid the plan area instead and you are short almost two squares of shingles, underlayment, and labor. On a 12:12 that footprint covers 2,263 sq ft.<\/p>\n<p class=\"pm__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a> turns a photo of the roof into an itemized estimate in about 6 seconds.<\/p>\n<h2>Pitch multiplier table<\/h2>\n<p>Geometry, so these never change. The last column applies the multiplier to a 1,600 sq ft footprint.<\/p>\n<table class=\"pm__table\">\n<thead>\n<tr>\n<th>Pitch<\/th>\n<th>Angle<\/th>\n<th>Multiplier<\/th>\n<th>Roof area on 1,600 sq ft<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>2:12<\/td>\n<td>9.5 degrees<\/td>\n<td>1.014<\/td>\n<td>1,622 sq ft<\/td>\n<\/tr>\n<tr>\n<td>4:12<\/td>\n<td>18.4 degrees<\/td>\n<td>1.054<\/td>\n<td>1,687 sq ft<\/td>\n<\/tr>\n<tr>\n<td>5:12<\/td>\n<td>22.6 degrees<\/td>\n<td>1.083<\/td>\n<td>1,733 sq ft<\/td>\n<\/tr>\n<tr>\n<td>6:12<\/td>\n<td>26.6 degrees<\/td>\n<td>1.118<\/td>\n<td>1,789 sq ft<\/td>\n<\/tr>\n<tr>\n<td>8:12<\/td>\n<td>33.7 degrees<\/td>\n<td>1.202<\/td>\n<td>1,923 sq ft<\/td>\n<\/tr>\n<tr>\n<td>9:12<\/td>\n<td>36.9 degrees<\/td>\n<td>1.250<\/td>\n<td>2,000 sq ft<\/td>\n<\/tr>\n<tr>\n<td>10:12<\/td>\n<td>39.8 degrees<\/td>\n<td>1.302<\/td>\n<td>2,083 sq ft<\/td>\n<\/tr>\n<tr>\n<td>12:12<\/td>\n<td>45.0 degrees<\/td>\n<td>1.414<\/td>\n<td>2,263 sq ft<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Where low slope starts, and what the code makes you do<\/h2>\n<p>IRC R905.2.2 is short and blunt. Asphalt shingles are allowed only on roof slopes of two units vertical in 12 units horizontal or greater. From 2:12 up to 4:12, double underlayment is required.<\/p>\n<p>The makers publish the same floor. TAMKO lists Elite Glass-Seal for decks with inclines of 2 in per foot or greater, and sends 2 in to under 4 in per foot to its low slope section. IKO prints it on the Cambridge sheet: never apply asphalt shingles to slopes less than 2:12. CertainTeed limits Landmark to slopes greater than 2 in per foot, with additional underlayment below 4:12.<\/p>\n<p>So 4:12 is where a shingle roof stops needing special treatment, and 2:12 is where shingles stop being legal. Below that you change coverings: a membrane, standing seam metal down to 1\/4:12, or lapped seam panels with sealant down to 1\/2:12.<\/p>\n<section class=\"pm__promo\">\n<h2>Turn the pitch into a priced roof<\/h2>\n<p>The calculator gives you the real surface area. SimplyWise Cost Estimator turns a photo into an itemized estimate in about 6 seconds. Pricing 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\">SimplyWise Cost Estimator<\/a><br \/>\n<\/section>\n<h2>Minimum pitch by roof covering<\/h2>\n<p>Chapter 9 sets a floor for every covering, not just shingles.<\/p>\n<table class=\"pm__table\">\n<thead>\n<tr>\n<th>Covering<\/th>\n<th>Minimum slope<\/th>\n<th>Section<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Asphalt shingles<\/td>\n<td>2:12, double underlayment below 4:12<\/td>\n<td>R905.2.2<\/td>\n<\/tr>\n<tr>\n<td>Clay and concrete tile<\/td>\n<td>2.5:12, double underlayment below 4:12<\/td>\n<td>R905.3.2<\/td>\n<\/tr>\n<tr>\n<td>Metal roof shingles<\/td>\n<td>3:12<\/td>\n<td>R905.4.2<\/td>\n<\/tr>\n<tr>\n<td>Wood shingles and shakes<\/td>\n<td>3:12<\/td>\n<td>R905.7.2, R905.8.2<\/td>\n<\/tr>\n<tr>\n<td>Lapped seam metal panels<\/td>\n<td>3:12, or 1\/2:12 with lap sealant<\/td>\n<td>R905.10.2<\/td>\n<\/tr>\n<tr>\n<td>Standing seam metal<\/td>\n<td>1\/4:12<\/td>\n<td>R905.10.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Measure the pitch without guessing<\/h2>\n<ol class=\"pm__steps\">\n<li>\n<h3>Work off a level, not your eye<\/h3>\n<p>Hold a 24 in level on the shingles, center the bubble, mark 12 in from the roof end, and measure straight down. That drop is the rise.<\/p>\n<\/li>\n<li>\n<h3>Measure a rafter instead if the roof is steep<\/h3>\n<p>From the attic, measure rafter rise and horizontal run to the ridge. Any pair works, and the calculator scales it back to a 12 in run.<\/p>\n<\/li>\n<li>\n<h3>Check every plane separately<\/h3>\n<p>Additions, dormers, and porches rarely share the main pitch. Run the calculator per plane and add the areas, because one multiplier across a mixed roof understates the steep half.<\/p>\n<\/li>\n<li>\n<h3>Convert to squares before you price<\/h3>\n<p>Roofers buy in squares of 100 sq ft. Divide surface area by 100, then add waste. The 1,789 sq ft example is 17.89 squares before cuts.<\/p>\n<\/li>\n<\/ol>\n<div class=\"pm__next\">\n<h2>Keep reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/construction-calculators\/\">Construction Calculators Hub<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/roof-replacement-cost\/\">Roof Replacement Cost<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/gutter-replacement-cost\/\">Gutter Replacement Cost<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/drywall-sheet-and-mud-calculator\/\">Drywall Sheet and Mud Calculator<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"pm__sources\">\n<h2>Sources<\/h2>\n<h3>Code limits<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.seattle.gov\/documents\/Departments\/SDCI\/Codes\/SeattleResidentialCode\/2012SRCChapter9.pdf\" rel=\"noopener\" target=\"_blank\">City of Seattle, Residential Code Chapter 9, Roof Assemblies<\/a> (R905.2.2 plus the R905.3.2 through R905.10.2 minimums; verified 2026-09-11).<\/li>\n<li><a href=\"https:\/\/cdn.townweb.com\/windsorlocksct.org\/wp-content\/uploads\/2024\/01\/Ashpalt_Shingle_Installation.pdf\" rel=\"noopener\" target=\"_blank\">Town of Windsor Locks CT, Asphalt Shingle Installation handout<\/a> (R905.2.2, 2:12 floor, double underlayment to 4:12; verified 2026-09-11).<\/li>\n<\/ul>\n<h3>Shingle maker data sheets<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.tamko.com\/docs\/default-source\/data-sheets\/TAMKO-3-tab-elite-glass-seal-data-sheet-(joplin).pdf?sfvrsn=a30256a0_29\" rel=\"noopener\" target=\"_blank\">TAMKO, Elite Glass-Seal data sheet<\/a> (inclines of 2 in per foot or greater; low slope from 2 in to under 4 in; verified 2026-09-11).<\/li>\n<li><a href=\"https:\/\/www.iko.com\/na\/wp-content\/uploads\/2024\/12\/4220XXX_IKO_TDS_Cambridge_EN.pdf\" rel=\"noopener\" target=\"_blank\">IKO, Cambridge technical data sheet<\/a> (never apply asphalt shingles to slopes less than 2:12; verified 2026-09-11).<\/li>\n<li><a href=\"https:\/\/www.buildsite.com\/pdf\/certainteed\/Landmark-Shingles-Product-Data-2899919.pdf\" rel=\"noopener\" target=\"_blank\">CertainTeed, Landmark product data<\/a> (slopes greater than 2 in per foot; additional underlayment below 4:12; verified 2026-09-11).<\/li>\n<\/ul>\n<h3>Product<\/h3>\n<ul>\n<li><a href=\"https:\/\/apps.apple.com\/us\/app\/simplywise-cost-estimator\/id6670619664\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator, App Store<\/a> (4.8 rating; verified 2026-09-09).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<section class=\"pm__faq\">\n<div class=\"pm__inner\">\n<h2>Common questions about roof pitch<\/h2>\n<h3>Pitch, angle, and area<\/h3>\n<details>\n<summary>What is a 6:12 roof pitch in degrees?<\/summary>\n<div>\n<p>26.6 degrees. Divide the 6 in rise by the 12 in run for 0.5, then take the arctangent in degrees.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How do I find the pitch multiplier?<\/summary>\n<div>\n<p>Take the square root of 1 plus the rise divided by run, squared. A 4:12 is 1.054, a 6:12 is 1.118, and a 12:12 is 1.414.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How do I get roof area from the footprint?<\/summary>\n<div>\n<p>Multiply plan area by the pitch multiplier. A 1,600 sq ft footprint under a 6:12 covers 1,789 sq ft of roof.<\/p>\n<\/div>\n<\/details>\n<h3>Pitch limits and roofing over them<\/h3>\n<details>\n<summary>What is the minimum pitch for asphalt shingles?<\/summary>\n<div>\n<p>2:12. IRC R905.2.2 allows asphalt shingles only on slopes of 2:12 or greater, and TAMKO, IKO, and CertainTeed publish the same floor.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>When does a roof need double underlayment?<\/summary>\n<div>\n<p>From 2:12 up to 4:12. R905.2.2 calls that range low slope and requires two layers of underlayment under the shingles.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Can SimplyWise price a roof from a photo?<\/summary>\n<div>\n<p>Yes. SimplyWise Cost Estimator turns a photo into an itemized estimate in about 6 seconds, with material and labor lines. Free to try, at $29.99\/mo or $239.99\/yr.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/section>\n<section class=\"pm__final\">\n<div class=\"pm__inner\">\n<span class=\"pm__eyebrow\">Measure once, bid once<\/span><\/p>\n<h2>Turn the pitch into a signed roofing quote.<\/h2>\n<p>Snap a photo and get an itemized estimate in about 6 seconds. Free to try.<\/p>\n<p><a class=\"pm__btn pm__btn--lg\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a>\n<\/div>\n<\/section>\n<\/article>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BlogPosting\",\n  \"headline\": \"Roof Pitch Calculator: Pitch, Angle, and Roof Area\",\n  \"description\": \"A roof pitch calculator that turns rise over a 12 in run, a measured rise and run, or an angle into pitch, slope angle, the pitch multiplier, and true roof area.\",\n  \"author\": {\n    \"@type\": \"Organization\",\n    \"name\": \"SimplyWise\"\n  },\n  \"publisher\": {\n    \"@type\": \"Organization\",\n    \"name\": \"SimplyWise\",\n    \"logo\": {\n      \"@type\": \"ImageObject\",\n      \"url\": \"https:\/\/www.simplywise.com\/icon-512x512.png\"\n    }\n  },\n  \"datePublished\": \"2026-09-16\",\n  \"dateModified\": \"2026-09-16\",\n  \"mainEntityOfPage\": {\n    \"@type\": \"WebPage\",\n    \"@id\": \"https:\/\/www.simplywise.com\/blog\/roof-pitch-calculator\/\"\n  },\n  \"url\": \"https:\/\/www.simplywise.com\/blog\/roof-pitch-calculator\/\",\n  \"image\": [\n    \"https:\/\/images.unsplash.com\/photo-1676802540678-2dceb1820113?w=1400&h=700&fit=crop&q=80&auto=format\"\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"HowTo\",\n  \"name\": \"How to Calculate Roof Pitch, Slope Angle, and Roof Area\",\n  \"step\": [\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 1,\n      \"name\": \"Work off a level, not your eye\",\n      \"text\": \"Hold a 24 inch level against a rafter or on the shingles, bring the bubble to center, mark 12 inches from the roof end, and measure straight down to the surface. That drop is the rise over a 12 inch run.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 2,\n      \"name\": \"Measure a rafter instead if the roof is steep\",\n      \"text\": \"From inside the attic, measure the rafter rise and the horizontal run to the ridge. Any rise and run pair works, because the ratio scales back to a 12 inch run.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 3,\n      \"name\": \"Check every roof plane separately\",\n      \"text\": \"Additions, dormers, and porches rarely share the main pitch. Calculate each plane on its own multiplier and add the surface areas together.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 4,\n      \"name\": \"Convert the surface area to squares\",\n      \"text\": \"Multiply the roof plan area by the pitch multiplier for true surface area, divide by 100 for roofing squares, then add a waste allowance before pricing material.\"\n    }\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a 6:12 roof pitch in degrees?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"26.6 degrees. Divide the 6 in rise by the 12 in run for 0.5, then take the arctangent in degrees.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I find the pitch multiplier?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Take the square root of 1 plus the rise divided by run, squared. A 4:12 is 1.054, a 6:12 is 1.118, and a 12:12 is 1.414.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I get roof area from the footprint?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Multiply plan area by the pitch multiplier. A 1,600 sq ft footprint under a 6:12 covers 1,789 sq ft of roof.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the minimum pitch for asphalt shingles?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"2:12. IRC R905.2.2 allows asphalt shingles only on slopes of 2:12 or greater, and TAMKO, IKO, and CertainTeed publish the same floor.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"When does a roof need double underlayment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"From 2:12 up to 4:12. R905.2.2 calls that range low slope and requires two layers of underlayment under the shingles.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can SimplyWise price a roof from a photo?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. SimplyWise Cost Estimator turns a photo into an itemized estimate in about 6 seconds, with material and labor lines. Free to try, at $29.99\/mo or $239.99\/yr.\"\n      }\n    }\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"itemListElement\": [\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 1,\n      \"name\": \"Home\",\n      \"item\": \"https:\/\/www.simplywise.com\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 2,\n      \"name\": \"Blog\",\n      \"item\": \"https:\/\/www.simplywise.com\/blog\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 3,\n      \"name\": \"How to Estimate\",\n      \"item\": \"https:\/\/www.simplywise.com\/blog\/category\/how-to-estimate\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 4,\n      \"name\": \"Roof Pitch Calculator: Pitch, Angle, and Roof Area\",\n      \"item\": \"https:\/\/www.simplywise.com\/blog\/roof-pitch-calculator\/\"\n    }\n  ]\n}\n<\/script><\/p>\n<div class=\"rv-site-footer\">\n<div><span class=\"rv-bgi rv-wm\" role=\"img\" aria-label=\"SimplyWise\" style=\"background-image:url('https:\/\/www.simplywise.com\/static-pages\/static\/main-landing-page\/assets\/brand\/wordmark-white.svg');aspect-ratio:546\/87\"><\/span><\/p>\n<p class=\"rv-tag\">Smart tools for contractors<\/p>\n<ul class=\"rv-foot-links\">\n<li><a href=\"https:\/\/simplywise.com\/login\">Log in<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/#program\">New Business Program<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/about\">About<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/support\">Support<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/privacy\">Privacy<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/terms\">Terms<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/\">Blog<\/a><\/li>\n<\/ul>\n<p><small>&copy; 2026 SimplyWise<\/small><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Estimates Receipts Mileage Room scans Visualizer Log in Estimates Receipts Mileage Room scans Visualizer Blog &nbsp;&rsaquo;&nbsp; How to Estimate Contractor Calculator &middot; Roofing Roof Pitch Calculator: Pitch, Angle, and Roof Area Roof pitch is rise over a 12 in run. Set the rise below, or type a measured angle, and the pitch, multiplier, and true [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"88","_yoast_wpseo_content_score":"60","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9454","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Roof Pitch Calculator: Pitch, Angle, and Roof Area<\/title>\n<meta name=\"description\" content=\"A roof pitch calculator that turns rise over a 12 inch run, a measured rise and run, or an angle into pitch, slope angle, and true roof area.\" \/>\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-pitch-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Roof Pitch Calculator: Pitch, Angle, and Roof Area\" \/>\n<meta property=\"og:description\" content=\"A roof pitch calculator that turns rise over a 12 inch run, a measured rise and run, or an angle into pitch, slope angle, and true roof area.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.simplywise.com\/blog\/roof-pitch-calculator\/\" \/>\n<meta property=\"og:site_name\" content=\"SimplyWise Cost Estimator\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-16T09:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-27T05:29:35+00:00\" \/>\n<meta property=\"og:image\" 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