{"id":9460,"date":"2026-09-17T09:00:00","date_gmt":"2026-09-17T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=9460"},"modified":"2026-09-17T15:13:33","modified_gmt":"2026-09-17T15:13:33","slug":"pipe-volume-calculator","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/pipe-volume-calculator\/","title":{"rendered":"Pipe Volume Calculator"},"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  document.body.style.marginTop='0'; 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Inter;color:#4b5563;}.swc__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;}.swc__row b{color:#111827;font-weight:700;font-variant-numeric:tabular-nums;text-align:right;}.swc__row--last{border-bottom:none;}.swc__note{font:500 12px\/1.55 Inter;color:#9ca3af;margin:6px 0 4px;}@media(max-width:600px){.swc{padding:20px 16px 14px;border-radius:16px;margin-top:22px;}.swc__grid,.swc__grid3{gap:10px;}.swc__grid3{grid-template-columns:1fr 1fr;}.swc__num{font-size:38px;}.swc__preset{padding:12px 0;}}<\/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; Plumbing<\/span><\/p>\n<h1>Pipe Volume Calculator: Gallons, Cubic Feet, and Water Weight<\/h1>\n<p class=\"pm__dek\">Nominal size is a label, not a measurement. Pick the material and schedule and the gallons, water weight and fill time update as you type.<\/p>\n<p class=\"pm__dek-cta\">Pricing the repipe? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Estimate it from a photo<\/a> in 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<\/span><\/div>\n<div class=\"pm__meta\">\n<span>SimplyWise<\/span><br \/>\n<i><\/i><br \/>\n<span>Updated September 17, 2026<\/span><br \/>\n<i><\/i><br \/>\n<span>5 min read<\/span>\n<\/div>\n<div class=\"swc\" id=\"swcalc\">\n<span class=\"swc__kicker\">Free Pipe Volume Calculator<\/span><\/p>\n<div class=\"swc__title\">Gallons, cubic feet, water weight, fill time<\/div>\n<div class=\"swc__grid\">\n<div class=\"swc__field\"><label for=\"swc-mat\">Material and schedule<\/label><select id=\"swc-mat\"><option value=\"pvc40\" selected>PVC Schedule 40<\/option><option value=\"pvc80\">PVC Schedule 80<\/option><option value=\"cuk\">Copper Type K<\/option><option value=\"cul\">Copper Type L<\/option><option value=\"cum\">Copper Type M<\/option><\/select><\/div>\n<div class=\"swc__field\"><label for=\"swc-size\">Nominal pipe size<\/label><select id=\"swc-size\"><option value=\"0.5\">1\/2 in<\/option><option value=\"0.75\">3\/4 in<\/option><option value=\"1\" selected>1 in<\/option><option value=\"1.25\">1-1\/4 in<\/option><option value=\"1.5\">1-1\/2 in<\/option><option value=\"2\">2 in<\/option><option value=\"3\">3 in<\/option><option value=\"4\">4 in<\/option><option value=\"6\">6 in<\/option><\/select><\/div>\n<\/div>\n<div class=\"swc__grid3\">\n<div class=\"swc__field\"><label for=\"swc-len\">Run length (ft)<\/label><input id=\"swc-len\" type=\"number\" inputmode=\"decimal\" min=\"0.5\" max=\"10000\" step=\"0.5\" value=\"100\"><\/div>\n<div class=\"swc__field\"><label for=\"swc-fill\">Fill percentage<\/label><input id=\"swc-fill\" type=\"number\" inputmode=\"decimal\" min=\"1\" max=\"100\" step=\"1\" value=\"100\"><\/div>\n<div class=\"swc__field\"><label for=\"swc-flow\">Flow rate (gpm)<\/label><input id=\"swc-flow\" type=\"number\" inputmode=\"decimal\" min=\"0.1\" max=\"500\" step=\"0.5\" value=\"5\"><\/div>\n<\/div>\n<div class=\"swc__out\" aria-live=\"polite\">\n<div class=\"swc__big\"><span class=\"swc__num\" id=\"swc-gal\">4.49<\/span><span class=\"swc__unit\" id=\"swc-gal-unit\">gallons of water, 1 in PVC Schedule 40<\/span><\/div>\n<div class=\"swc__row\"><span>Internal volume<\/span><b id=\"swc-cuft\">0.6 cu ft<\/b><\/div>\n<div class=\"swc__row\"><span>Inside diameter<\/span><b id=\"swc-id\">1.049 in inside diameter<\/b><\/div>\n<div class=\"swc__row\"><span>Water weight<\/span><b id=\"swc-wt\">37.4 lb of water<\/b><\/div>\n<div class=\"swc__row\"><span>Fill time<\/span><b id=\"swc-time\">54 sec at 5 gpm<\/b><\/div>\n<div class=\"swc__row swc__row--last\"><span>Volume per foot<\/span><b id=\"swc-perft\">0.0449 gal per ft<\/b><\/div>\n<p class=\"swc__note\">Inside diameters from published maker and association dimension tables, read September 11, 2026. Water at 8.34 lb per gallon.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/header>\n<p><script>\n(function(){\n  \/\/ INSIDE DIAMETERS are SOURCED DATA. One block. Every value sits on the same\n  \/\/ published table row as its nominal size and schedule. All read 2026-09-11.\n  \/\/   PVC Schedule 40 and Schedule 80: Charlotte Pipe and Foundry Company,\n  \/\/     Dimensional Catalog, Plastics Pressure Systems\n  \/\/     (charlottepipe.com\/uploads\/documents\/technical\/DC-PR.pdf), Pipe Data page\n  \/\/     \"PVC Schedule 80 Pipe, Type 1, Grade 1, Plain End\" and Pipe Data page\n  \/\/     \"PVC Schedule 40 Pipe, Plain End\", both marked ASTM D 1785. The sheet\n  \/\/     publishes average OD and minimum wall on each row; inside diameter is\n  \/\/     average OD minus two wall thicknesses off that same row.\n  \/\/   Copper Type K, Type L, Type M: Copper Development Association, Copper Tube\n  \/\/     Handbook, CDA Publication A4015-26\/24 (copper.org\/wp-content\/uploads\/\n  \/\/     2026\/04\/copper_tube_handbook_print_press.pdf), Tables 14.2a, 14.2b and\n  \/\/     14.2c, which print inside diameter directly against each nominal size.\n  \/\/     The same tables publish a gallons per linear foot column, and it matches\n  \/\/     what this script computes, which is the cross check on the geometry.\n  \/\/ CONSTANTS\n  \/\/   231 cubic inches per gallon, exactly: NIST Handbook 44 (2026 edition),\n  \/\/     Appendix C, General Tables of Units of Measurement, read 2026-09-11.\n  \/\/   8.34 lb per gallon of water: derived from the USGS Water Science School\n  \/\/     water density page (62.424 lb per cubic foot at 39.2 F, read 2026-09-11)\n  \/\/     times 231\/1728 cubic feet per gallon, which gives 8.3449 lb.\n  var ID={\n    pvc40:{'0.5':0.622,'0.75':0.824,'1':1.049,'1.25':1.380,'1.5':1.610,'2':2.067,'3':3.068,'4':4.026,'6':6.065},\n    pvc80:{'0.5':0.546,'0.75':0.742,'1':0.957,'1.25':1.278,'1.5':1.500,'2':1.939,'3':2.900,'4':3.826,'6':5.761},\n    cuk:{'0.5':0.527,'0.75':0.745,'1':0.995,'1.25':1.245,'1.5':1.481,'2':1.959,'3':2.907,'4':3.857,'6':5.741},\n    cul:{'0.5':0.545,'0.75':0.785,'1':1.025,'1.25':1.265,'1.5':1.505,'2':1.985,'3':2.945,'4':3.905,'6':5.845},\n    cum:{'0.5':0.569,'0.75':0.811,'1':1.055,'1.25':1.291,'1.5':1.527,'2':2.009,'3':2.981,'4':3.935,'6':5.881}\n  };\n  var MATNAME={pvc40:'PVC Schedule 40',pvc80:'PVC Schedule 80',cuk:'copper Type K',cul:'copper Type L',cum:'copper Type M'};\n  var SIZENAME={'0.5':'1\/2 in','0.75':'3\/4 in','1':'1 in','1.25':'1-1\/4 in','1.5':'1-1\/2 in','2':'2 in','3':'3 in','4':'4 in','6':'6 in'};\n  var CU_IN_PER_GAL=231, CU_IN_PER_CU_FT=1728, LB_PER_GAL=8.34;\n  function $(i){return document.getElementById(i);}\n  function ceil6(x){return Math.ceil(Number(x.toFixed(6)));}\n  function fmt(n,d){var s=n.toFixed(d);if(s.indexOf('.')>=0){s=s.replace(\/\\.?0+$\/,'');}return s;}\n  function val(el,lo,hi){var v=parseFloat(el.value);if(!isFinite(v)||v<lo||v>hi){return null;}return v;}\n  function clock(sec){\n    if(sec<60){return sec+' sec';}\n    var m=Math.floor(sec\/60), s=sec-60*m;\n    if(m<60){return m+' min '+s+' sec';}\n    var h=Math.floor(m\/60); m=m-60*h;\n    return h+' hr '+m+' min '+s+' sec';\n  }\n  function run(){\n    var mat=$('swc-mat').value, size=$('swc-size').value;\n    var len=val($('swc-len'),0.5,10000), fill=val($('swc-fill'),1,100), flow=val($('swc-flow'),0.1,500);\n    var d=(ID[mat]||{})[size];\n    if(!d||len===null||fill===null||flow===null){\n      $('swc-gal').textContent='0';\n      $('swc-gal-unit').textContent='enter the run length';\n      $('swc-cuft').textContent='0 cu ft';\n      $('swc-id').textContent='0 in inside diameter';\n      $('swc-wt').textContent='0 lb of water';\n      $('swc-time').textContent='0 sec';\n      $('swc-perft').textContent='0 gal per ft';\n      return;\n    }\n    var r=d\/2;\n    var area=Math.PI*r*r;                       \/\/ square inches of bore\n    var cuIn=area*len*12*(fill\/100);            \/\/ cubic inches of water\n    var gal=cuIn\/CU_IN_PER_GAL;\n    var cuFt=cuIn\/CU_IN_PER_CU_FT;\n    var galStr=fmt(gal,2);\n    var galShown=parseFloat(galStr);            \/\/ weight and time follow the shown figure\n    var lb=galShown*LB_PER_GAL;\n    var secs=ceil6(galShown*60\/flow);           \/\/ fill time rounds UP to the next whole second\n    $('swc-gal').textContent=galStr;\n    $('swc-gal-unit').textContent='gallons of water, '+SIZENAME[size]+' '+MATNAME[mat];\n    $('swc-cuft').textContent=fmt(cuFt,3)+' cu ft';\n    $('swc-id').textContent=fmt(d,3)+' in inside diameter';\n    $('swc-wt').textContent=fmt(lb,1)+' lb of water';\n    $('swc-time').textContent=clock(secs)+' at '+fmt(flow,2)+' gpm';\n    $('swc-perft').textContent=fmt(gal\/len,4)+' gal per ft';\n  }\n  ['swc-mat','swc-size'].forEach(function(i){$(i).addEventListener('change',run);});\n  ['swc-len','swc-fill','swc-flow'].forEach(function(i){$(i).addEventListener('input',run);});\n  run();\n})();\n<\/script><\/p>\n<figure class=\"pm__fig\">\n<img decoding=\"async\" alt=\"A bank of plumbing pipes run across a wall, each size carrying a different inside diameter\" loading=\"eager\" src=\"https:\/\/images.unsplash.com\/photo-1646009445351-b8192e095f3a?w=1400&amp;h=700&amp;fit=crop&amp;q=80&amp;auto=format\"\/><br \/>\n<\/figure>\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>Volume = pi times inside radius squared times length. Nominal size is not the bore.<\/li>\n<li>Gallons = cubic inches \/ 231. Cubic feet = cubic inches \/ 1,728.<\/li>\n<li>Water weighs 8.34 lb a gallon, so 100 ft of 2 in Schedule 40 carries 145 lb.<\/li>\n<li>Schedule 80 shares an outside diameter with Schedule 40 and adds wall, so it holds less.<\/li>\n<li>Copper Type K is the thickest wall and the smallest bore. Type M is the thinnest.<\/li>\n<li>100 ft of 1 in Schedule 40 holds 4.49 gallons, weighs 37.4 lb, fills in 54 seconds at 5 gpm.<\/li>\n<\/ol>\n<div class=\"pm__tldr-cta\"><span>Price the repipe as fast as you size it, 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 pipe volume calculator works<\/h2>\n<p>A pipe is a cylinder, so volume is pi times the inside radius squared times the length. One part is hard: the inside radius is the number nobody has on hand, because pipe is sold by nominal size and nominal size is a label.<\/p>\n<p>Half inch Schedule 40 PVC measures 0.622 in inside. Half inch Type L copper measures 0.545 in. Feed 0.5 into Schedule 40 and the answer is low by a third.<\/p>\n<h2>Worked example: 100 feet of 1 inch Schedule 40<\/h2>\n<p>The published bore is <strong>1.049 in<\/strong>, so the radius is 0.5245 in and the bore area 0.864 square inches. Times 1,200 inches of run: 1,037 cubic inches.<\/p>\n<p>Divide by 231 and that is <strong>4.49 gallons<\/strong>, or 0.6 cubic feet. At 8.34 lb a gallon the water weighs <strong>37.4 lb<\/strong>, and at 5 gpm the run fills in 54 seconds.<\/p>\n<p class=\"pm__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a> turns the same run into a priced estimate from one photo.<\/p>\n<h2>Inside diameter by size and schedule<\/h2>\n<p>Published dimensions, in inches, off maker and association tables.<\/p>\n<table class=\"pm__table\">\n<thead>\n<tr>\n<th>Nominal<\/th>\n<th>PVC Sch 40<\/th>\n<th>PVC Sch 80<\/th>\n<th>Copper K<\/th>\n<th>Copper L<\/th>\n<th>Copper M<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1\/2 in<\/td>\n<td>0.622<\/td>\n<td>0.546<\/td>\n<td>0.527<\/td>\n<td>0.545<\/td>\n<td>0.569<\/td>\n<\/tr>\n<tr>\n<td>3\/4 in<\/td>\n<td>0.824<\/td>\n<td>0.742<\/td>\n<td>0.745<\/td>\n<td>0.785<\/td>\n<td>0.811<\/td>\n<\/tr>\n<tr>\n<td>1 in<\/td>\n<td>1.049<\/td>\n<td>0.957<\/td>\n<td>0.995<\/td>\n<td>1.025<\/td>\n<td>1.055<\/td>\n<\/tr>\n<tr>\n<td>1-1\/4 in<\/td>\n<td>1.380<\/td>\n<td>1.278<\/td>\n<td>1.245<\/td>\n<td>1.265<\/td>\n<td>1.291<\/td>\n<\/tr>\n<tr>\n<td>1-1\/2 in<\/td>\n<td>1.610<\/td>\n<td>1.500<\/td>\n<td>1.481<\/td>\n<td>1.505<\/td>\n<td>1.527<\/td>\n<\/tr>\n<tr>\n<td>2 in<\/td>\n<td>2.067<\/td>\n<td>1.939<\/td>\n<td>1.959<\/td>\n<td>1.985<\/td>\n<td>2.009<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Read one row across. At 2 in nominal the bore swings from 1.939 in to 2.067 in, and volume moves with its square.<\/p>\n<h2>Why Schedule 80 holds less<\/h2>\n<p>Schedule is wall thickness, not size. Both share an outside diameter, so the same fittings fit either. The thicker wall comes out of the bore.<\/p>\n<p>Two inch Schedule 40 runs a 0.154 in wall and a 2.067 in bore. Schedule 80 runs 0.218 in and 1.939 in. Six percent off the diameter is twelve percent off the volume.<\/p>\n<section class=\"pm__promo\">\n<h2>Turn the takeoff into a signed quote<\/h2>\n<p>Sizing the pipe is the easy half. SimplyWise Cost Estimator turns a photo into an itemized estimate in about 6 seconds, with material and labor line items. 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>Copper Type K, Type L and Type M<\/h2>\n<p>Copper water tube holds one outside diameter per size, always an eighth of an inch over nominal, with three wall thicknesses inside it. Type K is heaviest, Type L is the common service wall, Type M is thinnest.<\/p>\n<p>Three quarter inch copper runs a 0.875 in outside diameter in all three. Inside: Type K 0.745 in, Type L 0.785 in, Type M 0.811 in. That is 2.26 gallons per 100 ft against 2.51 against 2.68, and on a recirculating loop the wall sets what you pay to keep it hot.<\/p>\n<h2>Water weight is the number that moves a job<\/h2>\n<p>Water weighs 8.34 lb a gallon, off a published density near 62.4 lb per cubic foot. Nobody thinks about it on a half inch branch. It matters once the run is big.<\/p>\n<p>A hundred feet of 4 in Schedule 40 holds 66.13 gallons, so the pipe gains <strong>551 lb<\/strong> the second it fills. Hangers and a wood joist both care.<\/p>\n<h2>Run the pipe volume calculator in this order<\/h2>\n<ol class=\"pm__steps\">\n<li>\n<h3>Read the size and the schedule off the pipe<\/h3>\n<p>The print carries both. Nominal size alone does not give you the bore.<\/p>\n<\/li>\n<li>\n<h3>Look up the published inside diameter<\/h3>\n<p>Use the maker or association dimension table. Never a rounded nominal number.<\/p>\n<\/li>\n<li>\n<h3>Multiply the bore area by the run length<\/h3>\n<p>Pi times radius squared times length in inches. Keep every unit in inches.<\/p>\n<\/li>\n<li>\n<h3>Convert, then weigh it<\/h3>\n<p>Divide by 231 for gallons or 1,728 for cubic feet, then gallons by 8.34 for pounds.<\/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: the full set<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/plumber-hourly-rate\/\">Plumber Hourly Rate: what the number is built from<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/how-much-does-a-plumber-cost\/\">How Much Does a Plumber Cost<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"pm__sources\">\n<h2>Sources<\/h2>\n<h3>PVC inside diameters<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.charlottepipe.com\/uploads\/documents\/technical\/DC-PR.pdf\" rel=\"noopener\" target=\"_blank\">Charlotte Pipe and Foundry, Dimensional Catalog, Plastics Pressure Systems<\/a> (Pipe Data pages for PVC Schedule 40 Plain End and PVC Schedule 80 Plain End, both marked ASTM D 1785; average OD and minimum wall per row; read 2026-09-11).<\/li>\n<\/ul>\n<h3>Copper tube inside diameters<\/h3>\n<ul>\n<li><a href=\"https:\/\/copper.org\/wp-content\/uploads\/2026\/04\/copper_tube_handbook_print_press.pdf\" rel=\"noopener\" target=\"_blank\">Copper Development Association, Copper Tube Handbook, CDA Publication A4015-26\/24<\/a> (Tables 14.2a, 14.2b and 14.2c, dimensions and physical characteristics of copper tube Type K, Type L and Type M; read 2026-09-11).<\/li>\n<\/ul>\n<h3>Units and water density<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.nist.gov\/document\/2026-nist-handbook-44-appendix-c\" rel=\"noopener\" target=\"_blank\">NIST Handbook 44, 2026, Appendix C, General Tables of Units of Measurement<\/a> (1 gallon = 231 cubic inches exactly; read 2026-09-11).<\/li>\n<li><a href=\"https:\/\/www.usgs.gov\/special-topics\/water-science-school\/science\/water-density\" rel=\"noopener\" target=\"_blank\">USGS Water Science School, Water Density<\/a> (62.424 lb per cubic foot at 39.2 F, which works out to 8.34 lb per gallon; read 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 on the pipe volume calculator<\/h2>\n<h3>Volume and gallons<\/h3>\n<details>\n<summary>How do I calculate the volume of water in a pipe?<\/summary>\n<div>\n<p>Multiply pi by the inside radius squared by the length, all in inches. Divide by 231 for gallons or 1,728 for cubic feet.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How many gallons are in 100 feet of 1 inch pipe?<\/summary>\n<div>\n<p>4.49 gallons in Schedule 40 PVC, on a 1.049 in bore. Schedule 80 holds 3.74 and Type L copper 4.29.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Is nominal pipe size the same as inside diameter?<\/summary>\n<div>\n<p>No. Half inch Schedule 40 PVC measures 0.622 in inside, half inch Type L copper 0.545 in. Use the published dimension.<\/p>\n<\/div>\n<\/details>\n<h3>Schedule, material and weight<\/h3>\n<details>\n<summary>Does Schedule 80 hold less water than Schedule 40?<\/summary>\n<div>\n<p>Yes. Both share an outside diameter, so the thicker wall comes out of the bore. Two inch drops from 17.43 gallons per 100 ft to 15.34.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How much does the water in a pipe weigh?<\/summary>\n<div>\n<p>8.34 lb a gallon. A hundred feet of 4 in Schedule 40 holds 66.13 gallons, so the run gains 551 lb.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Can SimplyWise price a repipe 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 line items. Free to try, $29.99\/mo.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/section>\n<section class=\"pm__final\">\n<div class=\"pm__inner\">\n<span class=\"pm__eyebrow\">Size it once<\/span><\/p>\n<h2>Turn the pipe takeoff into a signed 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\": \"Pipe Volume Calculator: Gallons, Cubic Feet, and Water Weight\",\n  \"description\": \"A pipe volume calculator that turns nominal size, material, schedule, run length and fill percentage into gallons, cubic feet, the weight of the water, and the fill time at a given flow rate.\",\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\": \"2026-09-17\",\n  \"dateModified\": \"2026-09-17\",\n  \"mainEntityOfPage\": {\n    \"@type\": \"WebPage\",\n    \"@id\": \"https:\/\/www.simplywise.com\/blog\/pipe-volume-calculator\/\"\n  },\n  \"url\": \"https:\/\/www.simplywise.com\/blog\/pipe-volume-calculator\/\",\n  \"image\": [\n    \"https:\/\/images.unsplash.com\/photo-1646009445351-b8192e095f3a?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 Pipe Volume\",\n  \"step\": [\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 1,\n      \"name\": \"Read the size and the schedule off the pipe\",\n      \"text\": \"The print on the pipe carries both the nominal size and the schedule or tube type. Nominal size on its own does not tell you the bore, so record both before looking anything up.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 2,\n      \"name\": \"Look up the published inside diameter\",\n      \"text\": \"Take the inside diameter from the maker or association dimension table for that material and schedule, reading the value off the same row as the nominal size. Never substitute the rounded nominal number.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 3,\n      \"name\": \"Multiply the bore area by the run length\",\n      \"text\": \"Multiply pi by the inside radius squared to get the bore area in square inches, then multiply by the run length in inches to get the internal volume in cubic inches.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 4,\n      \"name\": \"Convert the volume, then weigh it\",\n      \"text\": \"Divide cubic inches by 231 for gallons or by 1,728 for cubic feet, then multiply the gallons by 8.34 to get the weight of the water in pounds.\"\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\": \"How do I calculate the volume of water in a pipe?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Multiply pi by the inside radius squared by the length, all in inches. Divide by 231 for gallons or 1,728 for cubic feet.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many gallons are in 100 feet of 1 inch pipe?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"4.49 gallons in Schedule 40 PVC, on a 1.049 in bore. Schedule 80 holds 3.74 and Type L copper 4.29.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is nominal pipe size the same as inside diameter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Half inch Schedule 40 PVC measures 0.622 in inside, half inch Type L copper 0.545 in. Use the published dimension.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does Schedule 80 hold less water than Schedule 40?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Both share an outside diameter, so the thicker wall comes out of the bore. 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Pick the material and schedule and the gallons, water weight and fill time update as you type. Pricing the repipe? Estimate it from a photo in six seconds. &#9733;&#9733;&#9733;&#9733;&#9733; 4.8 [&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":"pipe volume calculator","_yoast_wpseo_title":"Pipe Volume Calculator: Gallons, Cubic Feet, and Water Weight","_yoast_wpseo_metadesc":"A pipe volume calculator that turns nominal size, material, schedule, run length and fill percentage into gallons, cubic feet, the weight of the water, and the fill time at a given flow rate.","_yoast_wpseo_linkdex":"72","_yoast_wpseo_content_score":"90","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9460","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - 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