{"id":65739,"date":"2026-09-29T18:29:14","date_gmt":"2026-09-29T15:29:14","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=65739"},"modified":"2026-09-29T18:29:14","modified_gmt":"2026-09-29T15:29:14","slug":"sunscreen-amount-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/beauty\/sunscreen-amount-calculator\/","title":{"rendered":"Sunscreen Amount Calculator"},"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\">How Much Sunscreen Do You Need?<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"65739\" data-favorite-title=\"Sunscreen Amount\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/beauty\/sunscreen-amount-calculator\/\" data-favorite-excerpt=\"Estimate how much sunscreen you need to cover your whole body, face, or a custom skin area, based on the medically recommended dose of 2 mg per cm\u00b2. Enter your height and weight or face measurements to get the amount in grams, milliliters and teaspoons.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-appearance\">\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\/sunscreen-amount-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-65739\" data-post=\"65739\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"is-single field\" id=\"input-1\"><span class=\"font-semibold\">Area to Cover<\/span><\/div><div class=\"field\" id=\"input-2\"><label for=\"field-2\">Body area to cover<\/label><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"body_area_to_cover\"><option value=\"whole\" selected>Whole body<\/option><option value=\"face\">Face only<\/option><option value=\"face_neck\">Face and neck<\/option><option value=\"custom\">Custom area<\/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 has-term\" id=\"input-3\" hidden><label for=\"field-3\">Custom area<\/label><div class=\"term\">A<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"custom_area\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 800\" min=\"1\" value=\"800\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm2\" selected>cm\u00b2<\/option><option value=\"in2\">in\u00b2<\/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><small id=\"calc-info-3\">Enter the skin area directly if you know it<\/small><\/div><div class=\"is-single field\" id=\"input-4\"><span class=\"font-semibold\">Body Measurements (for whole body)<\/span><\/div><div class=\"field has-term\" id=\"input-5\"><label for=\"field-6\">Height<\/label><div class=\"term\">h<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"height\" id=\"field-6\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"170\"\/><div class=\"grid grid-cols-1\"><select id=\"field-7\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm\" selected>cm<\/option><option value=\"in\">in<\/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 has-term\" id=\"input-6\"><label for=\"field-8\">Weight<\/label><div class=\"term\">w<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"weight\" id=\"field-8\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"70\"\/><div class=\"grid grid-cols-1\"><select id=\"field-9\" name=\"unit\" aria-label=\"Unit\"><option value=\"kg\" selected>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=\"is-single field\" id=\"input-7\" hidden><span class=\"font-semibold\">Face Measurements (optional)<\/span><\/div><div class=\"field has-term\" id=\"input-8\" hidden><label for=\"field-11\">Face length<\/label><div class=\"term\">L<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"face_length\" id=\"field-11\" aria-describedby=\"calc-info-11\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"18\"\/><div class=\"grid grid-cols-1\"><select id=\"field-12\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm\" selected>cm<\/option><option value=\"in\">in<\/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><small id=\"calc-info-11\">Measure from chin to hairline<\/small><\/div><div class=\"field has-term\" id=\"input-9\" hidden><label for=\"field-13\">Face width<\/label><div class=\"term\">W<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"face_width\" id=\"field-13\" aria-describedby=\"calc-info-13\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"15\"\/><div class=\"grid grid-cols-1\"><select id=\"field-14\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm\" selected>cm<\/option><option value=\"in\">in<\/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><small id=\"calc-info-13\">Measure across the widest part of the face<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"65739\">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> Sunscreen Needed<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Area to cover<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"cm\u00b2\"><\/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>Sunscreen amount<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"g\"><\/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>Sunscreen volume<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"ml\"><\/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-4\"><span class=\"field-title\"><span>Application Tips<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/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=\"65739\" 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>Sunscreen Amount<\/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\\[ A_{\\text{body}} = \\sqrt{\\frac{h \\times w}{3600}} \\quad (\\text{m}^2) \\]\n\\[ m = A \\times 2~\\text{mg\/cm}^2 = A \\times 0.002~\\text{g\/cm}^2 \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(A\\) \u2014 skin area to cover (cm\u00b2)<\/li>\n<li>\\(h\\) \u2014 height (cm)<\/li>\n<li>\\(w\\) \u2014 weight (kg)<\/li>\n<li>\\(m\\) \u2014 mass of sunscreen needed (g)<\/li>\n<\/ul>\n<p>For the whole body, the skin area is estimated with the Mosteller formula for body surface area (BSA). The sunscreen amount then follows the internationally recommended application density of 2 mg of product per cm\u00b2 of skin \u2014 the dose at which SPF values are tested in laboratories. Since typical sunscreen has a density close to 1 g\/ml, the mass in grams is roughly equal to the volume in milliliters.<\/p>\n<p>For the face, the area is estimated either from your face length and width (with a 10% correction for curvature) or from typical adult values: about 360 cm\u00b2 for the face alone and 600 cm\u00b2 for the face and neck.<\/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>Sunscreen Amount \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> an adult 170 cm tall weighing 70 kg wants to know how much sunscreen to apply to their whole body.<\/p>\n<p>\\[ A = \\sqrt{\\frac{170 \\times 70}{3600}} = \\sqrt{3.306} \\approx 1.82~\\text{m}^2 = 18\\,181~\\text{cm}^2 \\]<\/p>\n<p>\\[ m = 18\\,181 \\times 0.002 \\approx 36.36~\\text{g} \\approx 36.36~\\text{ml} \\]<\/p>\n<p><strong>Result:<\/strong> about 36 g (roughly 36 ml, or 7.4 teaspoons) of sunscreen for one full-body application. A standard 100 ml bottle therefore holds only about three full-body applications.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Select the <strong>Body area to cover<\/strong>: Whole body, Face only, Face and neck, or Custom area.<\/li>\n<li>For <strong>Whole body<\/strong>, enter your <strong>Height<\/strong> and <strong>Weight<\/strong> and choose the units. The calculator estimates your skin area with the Mosteller formula.<\/li>\n<li>For <strong>Face only<\/strong> or <strong>Face and neck<\/strong>, you can optionally enter <strong>Face length<\/strong> (chin to hairline) and <strong>Face width<\/strong> (across the widest part). If you leave both empty, typical adult face areas are used instead.<\/li>\n<li>For <strong>Custom area<\/strong>, type the skin area directly in cm\u00b2 or in\u00b2 \u2014 useful for a single arm, leg, or back.<\/li>\n<li>Read the results: the area to cover, the sunscreen amount in grams, the volume in milliliters, and a tip expressing the amount in teaspoons.<\/li>\n<\/ol>\n<h2>Why the Amount of Sunscreen Matters<\/h2>\n<p>Sunscreen SPF ratings are determined in laboratory tests using an application density of 2 mg\/cm\u00b2. This is the reference dose used by regulators in the United States, Europe, and Australia. When you apply less \u2014 as most people do, often by a factor of two to four \u2014 the effective protection drops sharply. Studies show that applying roughly half the tested amount can reduce an SPF 50 product to an SPF of around 20 or lower, and thin, uneven layers miss spots entirely.<\/p>\n<p>The calculator translates that reference dose into a practical quantity for your body size. A 70 kg, 170 cm adult needs about 36 ml per full-body application, which is far more than most people use. A useful rule of thumb backed by dermatology organizations is the \"teaspoon rule\": one teaspoon for the face and neck, one for each arm, two for each leg, two for the front of the torso, and two for the back.<\/p>\n<p>Note that the amount you need does not depend on SPF \u2014 SPF 30 and SPF 50 are applied in the same quantity. A higher SPF only compensates partially for under-application; it cannot rescue a layer that is too thin or patchy.<\/p>\n<p>If you want to check the body surface area used for the whole-body estimate in more detail, try our <a href=\"https:\/\/wpcalc.com\/en\/beauty\/body-surface-area-calculator\/\">Body Surface Area calculator<\/a>.<\/p>\n<h2>Reapplication and Practical Tips<\/h2>\n<p>One application is not enough for a day outdoors. Reapply sunscreen every two hours, and immediately after swimming, heavy sweating, or towelling off \u2014 even if the product is labeled water-resistant. Water resistance only means the SPF is maintained during a defined period of water exposure (typically 40 or 80 minutes), not all day.<\/p>\n<p>Remember easily missed areas: ears, hairline, back of the neck, tops of the feet, and the backs of the hands. Lips benefit from an SPF lip balm. Apply sunscreen about 15 minutes before sun exposure so it can bind to the skin, and use enough that the skin looks visibly coated before rubbing in.<\/p>\n<p>A few limitations of this calculator:<\/p>\n<ul>\n<li>The whole-body estimate uses the Mosteller BSA formula, which is an average model; individual body shapes vary, and the estimate does not subtract clothing coverage. If you will wear a t-shirt and shorts, the Custom area option can approximate the exposed skin only.<\/li>\n<li>The face estimate uses a rectangular approximation of your measurements. If you leave the fields empty, typical adult values (360 cm\u00b2 face, 600 cm\u00b2 face and neck) are used.<\/li>\n<li>The conversion from grams to milliliters assumes a product density of about 1 g\/ml, which holds for most lotions. Thick creams or sprays may differ slightly, and spray sunscreens should be applied until the skin glistens evenly.<\/li>\n<li>The result covers one application for one person. Multiply by the number of applications and people to estimate how much sunscreen to pack for a trip.<\/li>\n<\/ul>\n<p>Alongside sun protection, general health metrics help you track your overall wellness. If you are building a broader health profile, our <a href=\"https:\/\/wpcalc.com\/en\/beauty\/resting-heart-rate-calculator\/\">Resting Heart Rate calculator<\/a> and <a href=\"https:\/\/wpcalc.com\/en\/beauty\/heart-rate-zones-calculator\/\">Heart Rate Zones calculator<\/a> are good places to start.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Estimate how much sunscreen you need to cover your whole body, face, or a custom skin area, based on the medically recommended dose of 2 mg per cm\u00b2. Enter your height and weight or face measurements to get the amount in grams, milliliters and teaspoons.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[12],"class_list":["post-65739","post","type-post","status-publish","format-standard","hentry","category-beauty","tag-appearance"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/65739","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\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=65739"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/65739\/revisions"}],"predecessor-version":[{"id":65757,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/65739\/revisions\/65757"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=65739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=65739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=65739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}