{"id":57511,"date":"2016-01-09T14:18:12","date_gmt":"2015-04-09T14:13:07","guid":{"rendered":"http:\/\/wpcalc.com\/?p=57511"},"modified":"2026-10-26T09:59:57","modified_gmt":"2026-10-26T06:59:57","slug":"water-requirement","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/beauty\/water-requirement\/","title":{"rendered":"Hydration Calculator \u2013 Daily Water Intake"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Hydration Needs Estimator<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"57511\" data-favorite-title=\"Daily Water Intake\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/beauty\/water-requirement\/\" data-favorite-excerpt=\"Estimate daily drinking water from your weight. Enter your weight in kilograms to see the result in milliliters, US fluid ounces, and 250 ml glasses.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-nutrition\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/beauty\/water-requirement\/\" method=\"POST\" class=\"calculator\" id=\"calculator-57511\" data-post=\"57511\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">Weight<\/label><div class=\"field-group\"><input type=\"text\" name=\"weight\" id=\"field-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"70\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"weight_unit\" aria-label=\"Weight unit\"><option value=\"kg\">kg<\/option><option value=\"lb\">lb<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field\" id=\"input-2\"><label for=\"field-3\">Exercise per day<\/label><input type=\"text\" name=\"exercise_per_day\" id=\"field-3\" aria-describedby=\"calc-unit-3 calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"0\"\/><div class=\"unit\" id=\"calc-unit-3\">min<\/div><small id=\"calc-info-3\">+12 oz (350 ml) for every 30 minutes<\/small><\/div><div class=\"field\" id=\"input-3\"><label for=\"field-4\">Climate<\/label><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"climate\"><option value=\"temperate\" selected>Temperate<\/option><option value=\"hot\">Hot or humid<\/option><option value=\"altitude\">High altitude (above 8,000 ft \/ 2,500 m)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field\" id=\"input-4\"><label for=\"field-5\">Pregnancy or breastfeeding<\/label><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"pregnancy_or_breastfeeding\"><option value=\"none\" selected>No<\/option><option value=\"pregnant\">Pregnant<\/option><option value=\"breastfeeding\">Breastfeeding<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field\" id=\"input-5\"><label for=\"field-6\">Wake-up time<\/label><input type=\"time\" name=\"wakeup_time\" id=\"field-6\" step=\"any\" value=\"07:00\"\/><\/div><div class=\"field\" id=\"input-6\"><label for=\"field-7\">Bedtime<\/label><input type=\"time\" name=\"bedtime\" id=\"field-7\" step=\"any\" value=\"23:00\"\/><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"57511\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Your Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Water<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"milliliters\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Water in US ounces<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"US ounces\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>Water in glasses (250 ml)<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"glasses\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>Water in liters<\/span><\/span><span class=\"field-value\" id=\"result-4\" data-unit=\"L\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-5\"><span class=\"field-title\"><span>Water in 8-oz glasses<\/span><\/span><span class=\"field-value\" id=\"result-5\" data-unit=\"glasses\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-6\"><span class=\"field-title\"><span>How the target is built<\/span><\/span><span class=\"field-value\" id=\"result-6\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-7\"><span class=\"field-title\"><span>Drinking schedule<\/span><\/span><span class=\"field-value\" id=\"result-7\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"57511\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Daily Water Intake Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ W_{\\mathrm{ml}} = 35m,\\qquad W_{\\mathrm{US\\ fl\\ oz}} = \\frac{W_{\\mathrm{ml}}}{29.5735},\\qquad G = \\frac{W_{\\mathrm{ml}}}{250} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(m\\) \u2014 weight in kilograms (kg)<\/li>\n<li>\\(W_{\\mathrm{ml}}\\) \u2014 estimated daily drinking water in milliliters (ml)<\/li>\n<li>\\(W_{\\mathrm{US\\ fl\\ oz}}\\) \u2014 the same volume in US fluid ounces<\/li>\n<li>\\(G\\) \u2014 the same volume in 250 ml glasses<\/li>\n<\/ul>\n<p>The calculator uses 35 ml of water per kilogram of body weight. The ounce and glass figures are conversions of that estimate, not additional amounts to drink.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Daily Water Intake \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> A person weighing 70 kg enters the calculator\u2019s default weight.<\/p>\n<p>\\[ 70 \\times 35 = 2{,}450\\ \\mathrm{ml} = 2.45\\ \\mathrm{L} \\]<\/p>\n<p>\\[ 2{,}450 \\div 29.5735 \\approx 82.8\\ \\mathrm{US\\ fl\\ oz} \\]<\/p>\n<p>\\[ 2{,}450 \\div 250 = 9.8\\ \\mathrm{glasses} \\]<\/p>\n<p><strong>Result:<\/strong> 2,450 ml per day, displayed as 82.8 US ounces or 9.8 glasses of 250 ml each.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Enter your body weight in kilograms in the <strong>Weight<\/strong> field. The calculator accepts values from 10 to 250 kg.<\/li>\n<li>Read <strong>Water<\/strong> for the estimated daily volume in milliliters. Divide this number by 1,000 if you prefer liters.<\/li>\n<li>Use <strong>Water in US ounces<\/strong> or <strong>Water in glasses (250 ml)<\/strong> if those units are easier to picture. These are three ways of showing the same volume; do not add them together.<\/li>\n<\/ol>\n<h2>What the daily water intake estimate means<\/h2>\n<p>Water helps regulate body temperature, carry nutrients, and replace fluid lost through breathing, sweating, and urination. This calculator turns body weight into a simple daily drinking-water estimate using a fixed rate of 35 ml per kg. It can provide a starting point for planning drinks throughout the day, but it does not measure your personal hydration status or prescribe an exact requirement.<\/p>\n<p>The result rises in proportion to weight: each additional kilogram adds 35 ml to the estimate. For example, a 60 kg person gets 2,100 ml, while an 80 kg person gets 2,800 ml. The displayed number of glasses assumes that each glass holds exactly 250 ml. Your cups or bottles may be a different size, so checking their capacity will make the estimate more useful.<\/p>\n<p><strong>US ounces<\/strong> in the result refers to US fluid ounces, a unit of volume, not ounces of weight. The calculator converts milliliters using approximately 29.5735 ml per US fluid ounce. It rounds the milliliter result to a whole number and the ounce and glass results to one decimal place. A result of 9.8 glasses, for instance, means slightly less than ten 250 ml glasses\u2014not that you must drink ten full glasses.<\/p>\n<p>This estimate concerns water to drink. Fluids from other beverages and water contained in food also contribute to hydration, so the result should not be compared directly with recommendations for <em>total water intake<\/em> that include both food and drinks. If you are also reviewing your daily nutrition, the <a href=\"https:\/\/wpcalc.com\/en\/beauty\/protein-calculator\/\">daily protein intake calculator<\/a> and <a href=\"https:\/\/wpcalc.com\/en\/beauty\/daily-vitamin-requirement\/\">daily vitamin requirement calculator<\/a> address different parts of that picture.<\/p>\n<h2>Assumptions and practical limits<\/h2>\n<p>The only input is <strong>Weight<\/strong>. The calculation does not adjust for exercise, heat, humidity, fever, pregnancy, breastfeeding, or individual differences in fluid loss. Sweating heavily may increase fluid needs; during prolonged exercise, replacing lost electrolytes can matter too. The <a href=\"https:\/\/wpcalc.com\/en\/beauty\/energy-expenditure\/\">daily energy expenditure calculator<\/a> can help put activity in context, but its calorie estimate does not determine how much water to drink.<\/p>\n<p>Avoid treating 35 ml\/kg as a minimum you must reach or a target you must exceed. Thirst, the color and frequency of urination, and the circumstances of your day can offer useful context, although none is a perfect test on its own. Drinking a very large amount of water in a short time can be harmful. If a clinician has given you a fluid limit or specific hydration advice\u2014particularly for kidney or heart conditions\u2014follow that guidance rather than this estimate.<\/p>\n<p>The weight range accepted by the field does not mean the formula is suitable for everyone in that range. In particular, children have age-dependent fluid needs that a weight-only adult-style rule may not capture. Use individualized medical advice when fluid needs or restrictions are uncertain.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Estimate daily drinking water from your weight. Enter your weight in kilograms to see the result in milliliters, US fluid ounces, and 250 ml glasses.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[22],"class_list":["post-57511","post","type-post","status-publish","format-standard","hentry","category-beauty","tag-nutrition"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57511","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/70"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=57511"}],"version-history":[{"count":3,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57511\/revisions"}],"predecessor-version":[{"id":67562,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57511\/revisions\/67562"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=57511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=57511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=57511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}