{"id":89130,"date":"2026-06-23T01:52:44","date_gmt":"2026-06-23T01:52:44","guid":{"rendered":"https:\/\/www.ampac1.com\/blog\/ro-system-calculator-2\/"},"modified":"2026-06-26T19:32:48","modified_gmt":"2026-06-26T19:32:48","slug":"ro-system-calculator-2","status":"publish","type":"page","link":"https:\/\/www.ampac1.com\/blog\/ro-system-calculator-2\/","title":{"rendered":"RO System Calculator: Size, TDS, Energy Cost, and Recovery"},"content":{"rendered":"<p>Use these calculators to size a commercial or industrial RO system, estimate product water quality, and calculate operating costs before you talk to a supplier.<\/p>\n<style>\n.calc-wrap { border:1px solid #d0d7e2; border-radius:6px; padding:24px; margin:32px 0; background:#fafbfd; }\n.calc-wrap h2 { margin-top:0; color:#003366; font-size:1.2em; border-bottom:2px solid #003366; padding-bottom:8px; }\n.calc-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; }\n@media(max-width:600px){ .calc-grid { grid-template-columns:1fr; } }\n.calc-field { display:flex; flex-direction:column; gap:4px; }\n.calc-field label { font-size:0.85em; font-weight:600; color:#444; }\n.calc-field input, .calc-field select { padding:8px 10px; border:1px solid #c0c8d4; border-radius:4px; font-size:1em; background:#fff; }\n.calc-btn { margin-top:16px; background:#003366; color:#fff; border:none; padding:10px 24px; border-radius:4px; font-size:1em; cursor:pointer; }\n.calc-btn:hover { background:#004a99; }\n.calc-result { margin-top:16px; padding:14px 18px; background:#e8f0fa; border-left:4px solid #003366; border-radius:0 4px 4px 0; font-size:1em; display:none; }\n.calc-result.show { display:block; }\n.result-main { font-size:1.4em; font-weight:700; color:#003366; }\n.result-sub { margin-top:6px; color:#444; font-size:0.9em; }\n<\/style>\n<p><!-- CALCULATOR 1: GPD Sizing --><\/p>\n<div class=\"calc-wrap\">\n<h2>1. RO System Sizing Calculator \u2014 What GPD Do I Need?<\/h2>\n<p style=\"margin-top:0;color:#555;font-size:0.9em;\">Enter your daily water consumption by use category. The calculator adds 20% capacity buffer and recommends a system size.<\/p>\n<div class=\"calc-grid\">\n<div class=\"calc-field\"><label>Restaurant \/ food service (gallons\/day)<\/label><input type=\"number\" id=\"gpd-restaurant\" value=\"0\" min=\"0\"><\/div>\n<div class=\"calc-field\"><label>Ice machine (gallons\/day)<\/label><input type=\"number\" id=\"gpd-ice\" value=\"0\" min=\"0\"><\/div>\n<div class=\"calc-field\"><label>Beverage \/ coffee station (gallons\/day)<\/label><input type=\"number\" id=\"gpd-beverage\" value=\"0\" min=\"0\"><\/div>\n<div class=\"calc-field\"><label>Car wash spot-free rinse (gallons\/day)<\/label><input type=\"number\" id=\"gpd-carwash\" value=\"0\" min=\"0\"><\/div>\n<div class=\"calc-field\"><label>Boiler \/ process feed (gallons\/day)<\/label><input type=\"number\" id=\"gpd-boiler\" value=\"0\" min=\"0\"><\/div>\n<div class=\"calc-field\"><label>Other \/ misc (gallons\/day)<\/label><input type=\"number\" id=\"gpd-other\" value=\"0\" min=\"0\"><\/div>\n<\/div>\n<p><button class=\"calc-btn\" onclick=\"calcGPD()\">Calculate System Size<\/button><\/p>\n<div class=\"calc-result\" id=\"gpd-result\">\n<div class=\"result-main\" id=\"gpd-main\"><\/div>\n<div class=\"result-sub\" id=\"gpd-sub\"><\/div>\n<\/div>\n<\/div>\n<p><!-- CALCULATOR 2: TDS Rejection --><\/p>\n<div class=\"calc-wrap\">\n<h2>2. Product Water TDS Calculator \u2014 What Will My Output TDS Be?<\/h2>\n<p style=\"margin-top:0;color:#555;font-size:0.9em;\">Estimate permeate TDS based on feed water TDS and membrane rejection rate.<\/p>\n<div class=\"calc-grid\">\n<div class=\"calc-field\"><label>Feed water TDS (ppm)<\/label><input type=\"number\" id=\"tds-feed\" value=\"500\" min=\"1\"><\/div>\n<div class=\"calc-field\"><label>Membrane rejection rate (%)<\/label><br \/>\n    <select id=\"tds-rejection\"><option value=\"99\">99% \u2014 High-rejection commercial (FILMTEC BW30-400)<\/option><option value=\"98\" selected>98% \u2014 Standard commercial membrane<\/option><option value=\"97\">97% \u2014 Economy commercial membrane<\/option><option value=\"99.5\">99.5% \u2014 SWRO seawater membrane<\/option><option value=\"95\">95% \u2014 Older or fouled membrane<\/option><\/select>\n  <\/div>\n<div class=\"calc-field\"><label>System recovery rate (%)<\/label><br \/>\n    <select id=\"tds-recovery\"><option value=\"75\" selected>75% (typical commercial)<\/option><option value=\"80\">80% (high-recovery)<\/option><option value=\"70\">70% (conservative \/ high-TDS feed)<\/option><option value=\"50\">50% (seawater \/ SWRO)<\/option><\/select>\n  <\/div>\n<\/div>\n<p><button class=\"calc-btn\" onclick=\"calcTDS()\">Calculate Permeate TDS<\/button><\/p>\n<div class=\"calc-result\" id=\"tds-result\">\n<div class=\"result-main\" id=\"tds-main\"><\/div>\n<div class=\"result-sub\" id=\"tds-sub\"><\/div>\n<\/div>\n<\/div>\n<p><!-- CALCULATOR 3: Membrane Count --><\/p>\n<div class=\"calc-wrap\">\n<h2>3. Membrane Element Count Calculator<\/h2>\n<p style=\"margin-top:0;color:#555;font-size:0.9em;\">Estimate the number of 4040 or 8040 membrane elements required for your target flow rate.<\/p>\n<div class=\"calc-grid\">\n<div class=\"calc-field\"><label>Required system output (GPD)<\/label><input type=\"number\" id=\"mem-gpd\" value=\"3000\" min=\"100\"><\/div>\n<div class=\"calc-field\"><label>Membrane element size<\/label><br \/>\n    <select id=\"mem-size\"><option value=\"1500\">4040 (1,500 GPD rated)<\/option><option value=\"10000\" selected>8040 (10,000 GPD rated)<\/option><option value=\"750\">2540 (750 GPD rated)<\/option><\/select>\n  <\/div>\n<div class=\"calc-field\"><label>Temperature derating factor<\/label><br \/>\n    <select id=\"mem-temp\"><option value=\"1.0\">77\u00b0F \/ 25\u00b0C \u2014 no derating (standard test temp)<\/option><option value=\"0.85\" selected>65\u00b0F \/ 18\u00b0C \u2014 15% derating<\/option><option value=\"0.75\">55\u00b0F \/ 13\u00b0C \u2014 25% derating<\/option><option value=\"0.65\">45\u00b0F \/ 7\u00b0C \u2014 35% derating<\/option><\/select>\n  <\/div>\n<div class=\"calc-field\"><label>Feed water TDS (ppm)<\/label><br \/>\n    <select id=\"mem-tds\"><option value=\"1.0\" selected>Under 500 ppm \u2014 no derating<\/option><option value=\"0.95\">500\u20131,000 ppm \u2014 5% derating<\/option><option value=\"0.90\">1,000\u20132,000 ppm \u2014 10% derating<\/option><option value=\"0.80\">2,000\u20135,000 ppm \u2014 20% derating<\/option><\/select>\n  <\/div>\n<\/div>\n<p><button class=\"calc-btn\" onclick=\"calcMem()\">Calculate Membrane Count<\/button><\/p>\n<div class=\"calc-result\" id=\"mem-result\">\n<div class=\"result-main\" id=\"mem-main\"><\/div>\n<div class=\"result-sub\" id=\"mem-sub\"><\/div>\n<\/div>\n<\/div>\n<p><!-- CALCULATOR 4: Energy Cost --><\/p>\n<div class=\"calc-wrap\">\n<h2>4. RO System Energy Cost Calculator<\/h2>\n<p style=\"margin-top:0;color:#555;font-size:0.9em;\">Estimate daily and annual electricity cost for your RO system pump.<\/p>\n<div class=\"calc-grid\">\n<div class=\"calc-field\"><label>System output (GPD)<\/label><input type=\"number\" id=\"eng-gpd\" value=\"3000\" min=\"100\"><\/div>\n<div class=\"calc-field\"><label>Pump motor size (kW)<\/label><br \/>\n    <select id=\"eng-kw\"><option value=\"0.1\">0.1 kW \u2014 100\u2013500 GPD residential\/light commercial<\/option><option value=\"0.37\">0.37 kW \u2014 500\u20131,000 GPD commercial<\/option><option value=\"0.75\">0.75 kW \u2014 1,000\u20132,000 GPD commercial<\/option><option value=\"1.5\" selected>1.5 kW \u2014 2,000\u20135,000 GPD commercial<\/option><option value=\"3.0\">3.0 kW \u2014 5,000\u201310,000 GPD commercial<\/option><option value=\"5.5\">5.5 kW \u2014 10,000\u201320,000 GPD industrial<\/option><option value=\"11\">11 kW \u2014 20,000\u201350,000 GPD industrial<\/option><\/select>\n  <\/div>\n<div class=\"calc-field\"><label>Operating hours per day<\/label><input type=\"number\" id=\"eng-hours\" value=\"12\" min=\"1\" max=\"24\"><\/div>\n<div class=\"calc-field\"><label>Electricity rate ($\/kWh)<\/label><input type=\"number\" id=\"eng-rate\" value=\"0.12\" min=\"0.01\" step=\"0.01\"><\/div>\n<\/div>\n<p><button class=\"calc-btn\" onclick=\"calcEnergy()\">Calculate Energy Cost<\/button><\/p>\n<div class=\"calc-result\" id=\"eng-result\">\n<div class=\"result-main\" id=\"eng-main\"><\/div>\n<div class=\"result-sub\" id=\"eng-sub\"><\/div>\n<\/div>\n<\/div>\n<p><!-- CALCULATOR 5: Recovery Ratio --><\/p>\n<div class=\"calc-wrap\">\n<h2>5. System Recovery and Concentrate TDS Calculator<\/h2>\n<p style=\"margin-top:0;color:#555;font-size:0.9em;\">Calculate your actual recovery rate and the TDS concentration in the reject (concentrate) stream \u2014 important for scaling risk and concentrate disposal planning.<\/p>\n<div class=\"calc-grid\">\n<div class=\"calc-field\"><label>Feed flow rate (GPM or GPH)<\/label><input type=\"number\" id=\"rec-feed\" value=\"10\" min=\"0.1\" step=\"0.1\"><\/div>\n<div class=\"calc-field\"><label>Unit<\/label><br \/>\n    <select id=\"rec-unit\"><option value=\"gpm\" selected>GPM (gallons per minute)<\/option><option value=\"gph\">GPH (gallons per hour)<\/option><\/select>\n  <\/div>\n<div class=\"calc-field\"><label>Permeate (product) flow rate (same unit)<\/label><input type=\"number\" id=\"rec-perm\" value=\"7.5\" min=\"0.1\" step=\"0.1\"><\/div>\n<div class=\"calc-field\"><label>Feed water TDS (ppm)<\/label><input type=\"number\" id=\"rec-tds\" value=\"500\" min=\"1\"><\/div>\n<\/div>\n<p><button class=\"calc-btn\" onclick=\"calcRecovery()\">Calculate Recovery and Concentrate TDS<\/button><\/p>\n<div class=\"calc-result\" id=\"rec-result\">\n<div class=\"result-main\" id=\"rec-main\"><\/div>\n<div class=\"result-sub\" id=\"rec-sub\"><\/div>\n<\/div>\n<\/div>\n<p><script>\nfunction calcGPD() {\n  var total = ['restaurant','ice','beverage','carwash','boiler','other']\n    .reduce(function(s,id){ return s + (parseFloat(document.getElementById('gpd-'+id).value)||0); }, 0);\n  var withBuffer = Math.ceil(total * 1.2);\n  var tiers = [100,200,500,1000,1500,2200,3000,5000,7500,10000,15000,20000];\n  var rec = tiers.find(function(t){ return t >= withBuffer; }) || withBuffer;\n  var r = document.getElementById('gpd-result');\n  document.getElementById('gpd-main').textContent = 'Recommended system: ' + rec.toLocaleString() + ' GPD';\n  document.getElementById('gpd-sub').innerHTML =\n    'Daily demand: <strong>' + total.toLocaleString() + ' GPD<\/strong> &nbsp;|&nbsp; With 20% buffer: <strong>' + withBuffer.toLocaleString() + ' GPD<\/strong><br \/>' +\n    (total === 0 ? 'Enter at least one usage value above.' :\n     'Pair with a <strong>' + Math.ceil(withBuffer \/ 24 * 4) + '\u2013' + Math.ceil(withBuffer \/ 24 * 8) + ' gallon storage tank<\/strong> to run a smaller continuous system rather than a larger on-demand unit.');\n  r.className = 'calc-result show';\n}<\/p>\n<p>function calcTDS() {\n  var feed = parseFloat(document.getElementById('tds-feed').value) || 500;\n  var rej = parseFloat(document.getElementById('tds-rejection').value) \/ 100;\n  var rec = parseFloat(document.getElementById('tds-recovery').value) \/ 100;\n  var permTDS = Math.round(feed * (1 - rej));\n  var concFactor = 1 \/ (1 - rec);\n  var concTDS = Math.round(feed * concFactor);\n  var r = document.getElementById('tds-result');\n  document.getElementById('tds-main').textContent = 'Permeate TDS: ~' + permTDS + ' ppm';\n  document.getElementById('tds-sub').innerHTML =\n    'Feed TDS: <strong>' + feed + ' ppm<\/strong> \u2192 Permeate: <strong>' + permTDS + ' ppm<\/strong> \u2192 Concentrate reject: <strong>' + concTDS + ' ppm<\/strong><br \/>' +\n    'Rejection: ' + (rej*100).toFixed(1) + '% &nbsp;|&nbsp; Recovery: ' + (rec*100).toFixed(0) + '% &nbsp;|&nbsp; Concentration factor: ' + concFactor.toFixed(2) + 'x<br \/>' +\n    (permTDS < 50 ? '\u2713 Excellent \u2014 suitable for most industrial and process applications.' :\n     permTDS < 150 ? '\u2713 Good \u2014 suitable for drinking water and food service.' :\n     permTDS < 300 ? '\u25ce Acceptable \u2014 meets most commercial drinking water standards.' :\n     '\u26a0 High \u2014 consider a higher-rejection membrane or two-pass RO.');\n  r.className = 'calc-result show';\n}\n\nfunction calcMem() {\n  var gpd = parseFloat(document.getElementById('mem-gpd').value) || 3000;\n  var rated = parseFloat(document.getElementById('mem-size').value);\n  var tempF = parseFloat(document.getElementById('mem-temp').value);\n  var tdsF = parseFloat(document.getElementById('mem-tds').value);\n  var effectiveGPD = rated * tempF * tdsF;\n  var count = Math.ceil(gpd \/ effectiveGPD);\n  var sizeLabel = document.getElementById('mem-size').options[document.getElementById('mem-size').selectedIndex].text.split(' ')[0];\n  document.getElementById('mem-main').textContent = count + ' \u00d7 ' + sizeLabel + ' membrane elements';\n  document.getElementById('mem-sub').innerHTML =\n    'Required output: <strong>' + gpd.toLocaleString() + ' GPD<\/strong><br \/>' +\n    'Effective output per element after derating: <strong>' + Math.round(effectiveGPD).toLocaleString() + ' GPD<\/strong><br \/>' +\n    'Array configuration: typically <strong>' + Math.ceil(count\/2) + ':' + Math.floor(count\/2) + '<\/strong> (lead:tail) in a ' + (count <= 6 ? 'single' : 'two') + '-stage array.' +\n    (count === 1 ? ' Single-element systems are common for light commercial applications.' : '');\n  document.getElementById('mem-result').className = 'calc-result show';\n}\n\nfunction calcEnergy() {\n  var kw = parseFloat(document.getElementById('eng-kw').value);\n  var hrs = parseFloat(document.getElementById('eng-hours').value) || 12;\n  var rate = parseFloat(document.getElementById('eng-rate').value) || 0.12;\n  var daily = kw * hrs * rate;\n  var annual = daily * 365;\n  document.getElementById('eng-main').textContent = '$' + daily.toFixed(2) + '\/day electricity cost';\n  document.getElementById('eng-sub').innerHTML =\n    'Motor: <strong>' + kw + ' kW<\/strong> \u00d7 <strong>' + hrs + ' hrs\/day<\/strong> \u00d7 <strong>$' + rate + '\/kWh<\/strong><br \/>' +\n    'Daily: <strong>$' + daily.toFixed(2) + '<\/strong> &nbsp;|&nbsp; Monthly: <strong>$' + (daily*30).toFixed(0) + '<\/strong> &nbsp;|&nbsp; Annual: <strong>$' + annual.toFixed(0) + '<\/strong><br \/>' +\n    'Daily energy consumption: <strong>' + (kw * hrs).toFixed(1) + ' kWh\/day<\/strong>';\n  document.getElementById('eng-result').className = 'calc-result show';\n}<\/p>\n<p>function calcRecovery() {\n  var feed = parseFloat(document.getElementById('rec-feed').value) || 10;\n  var perm = parseFloat(document.getElementById('rec-perm').value) || 7.5;\n  var tds = parseFloat(document.getElementById('rec-tds').value) || 500;\n  var unit = document.getElementById('rec-unit').value;\n  if (perm >= feed) { alert('Permeate flow cannot exceed feed flow.'); return; }\n  var conc = feed - perm;\n  var rec = (perm \/ feed) * 100;\n  var concTDS = Math.round((feed * tds - perm * 0) \/ conc);\n  var label = unit === 'gpm' ? 'GPM' : 'GPH';\n  document.getElementById('rec-main').textContent = rec.toFixed(1) + '% recovery';\n  document.getElementById('rec-sub').innerHTML =\n    'Feed: <strong>' + feed + ' ' + label + '<\/strong> \u2192 Permeate: <strong>' + perm + ' ' + label + '<\/strong> \u2192 Concentrate: <strong>' + conc.toFixed(1) + ' ' + label + '<\/strong><br \/>' +\n    'Feed TDS: <strong>' + tds + ' ppm<\/strong> \u2192 Estimated concentrate TDS: <strong>' + concTDS.toLocaleString() + ' ppm<\/strong><br \/>' +\n    (rec > 85 ? '\u26a0 High recovery (&gt;85%) increases scaling risk. Verify antiscalant dosing and Langelier Saturation Index.' :\n     rec < 50 ? '\u25ce Low recovery \u2014 significant water waste. Consider adjusting concentrate valve or system design.' :\n     '\u2713 Recovery is in the normal commercial range (70\u201385%).');\n  document.getElementById('rec-result').className = 'calc-result show';\n}\n<\/script><\/p>\n<hr style=\"margin:40px 0;border-color:#d0d7e2;\">\n<h2>How to Use These Results<\/h2>\n<p>These calculators use standard RO engineering assumptions. Real-world performance depends on your actual feed water chemistry, system operating conditions, and membrane brand. Use the numbers here as a starting point for conversations with your RO supplier \u2014 not as a substitute for a site-specific engineering review.<\/p>\n<p>Key variables that affect actual performance beyond what these calculators model:<\/p>\n<ul>\n<li><strong>Feed water hardness and scaling potential:<\/strong> High LSI (Langelier Saturation Index) water requires antiscalant dosing or softening pre-treatment to protect membranes.<\/li>\n<li><strong>SDI (Silt Density Index):<\/strong> SDI above 5 in the RO feed causes rapid fouling. Pre-filtration must be sized to bring SDI below 5.<\/li>\n<li><strong>Chlorine and oxidants:<\/strong> Polyamide membranes are chlorine-sensitive. Any chlorinated supply requires carbon pre-filtration.<\/li>\n<li><strong>Feed pressure availability:<\/strong> Low supply pressure reduces pump efficiency and system output.<\/li>\n<\/ul>\n<div style=\"border-left:4px solid #003366;background-color:#f0f4f8;padding:20px 24px;margin:36px 0;\">\n<h3 style=\"margin-top:0;color:#003366;\">Get a System Recommendation Based on Your Numbers<\/h3>\n<p>Tell AMPAC USA's engineering team your calculated GPD requirement, feed water TDS, and application. We'll recommend the right system and pre-treatment configuration \u2014 and give you a factory-tested quote. Made in USA. 2-year warranty.<\/p>\n<p style=\"margin-bottom:0;\"><a href=\"https:\/\/www.ampac1.com\/contact\" style=\"background-color:#003366;color:#ffffff;padding:10px 20px;text-decoration:none;border-radius:4px;display:inline-block;\">Request a System Quote<\/a><\/p>\n<\/div>\n<div class=\"ampac-related-links\" style=\"margin-top:2.5em;padding:1.25em 1.5em;border-top:3px solid #0a5ca8;background:#f6f9fc;border-radius:4px\">\n<h3 style=\"margin-top:0\">Related AMPAC systems &amp; guides<\/h3>\n<ul style=\"margin-bottom:0\">\n<li><a href=\"https:\/\/www.ampac1.com\/products\/commercial-reverse-osmosis-system\">commercial reverse osmosis systems<\/a><\/li>\n<li><a href=\"https:\/\/www.ampac1.com\/blog\/commercial-reverse-osmosis-system-buyers-guide\/\">Commercial RO buyer's guide<\/a><\/li>\n<li><a href=\"https:\/\/www.ampac1.com\/commercial-turnkey-reverse-osmosis-3-000-gpd-11-4m3-day\">3,000 GPD turnkey RO system<\/a><\/li>\n<li><a href=\"https:\/\/www.ampac1.com\/blog\/reverse-osmosis-system-maintenance-guide\/\">RO system maintenance guide<\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Use these calculators to size a commercial or industrial RO system, estimate product water quality, and calculate operating costs before you talk to a supplier&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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