{"id":55872,"date":"2015-10-24T16:04:50","date_gmt":"2015-10-24T14:04:50","guid":{"rendered":"http:\/\/wpcalc.com\/?p=55872"},"modified":"2026-09-28T09:32:37","modified_gmt":"2026-09-28T06:32:37","slug":"pressure","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/pressure\/","title":{"rendered":"Pressure Converter"},"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\">Convert Pressure Between Units<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"55872\" data-favorite-title=\"Pressure\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/pressure\/\" data-favorite-excerpt=\"Convert a pressure value between Pa, kPa, MPa, bar, atm, mmHg, cmHg, inHg, psi, and torr. Enter the value and select the starting and target units.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-physic\">\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\/converters\/pressure\/\" method=\"POST\" class=\"calculator\" id=\"calculator-55872\" data-post=\"55872\"><fieldset class=\"fieldset-input\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field is-single\" id=\"input-1\"><label for=\"field-1\">Pressure value<\/label><input type=\"text\" name=\"pressure_value\" id=\"field-1\" aria-describedby=\"calc-unit-1 calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"101325\"\/><div class=\"unit\" id=\"calc-unit-1\"><\/div><small id=\"calc-info-1\">Enter the pressure value to convert<\/small><\/div><div class=\"field\" id=\"input-2\"><label for=\"field-2\">From unit<\/label><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"from_unit\"><option value=\"Pa\">Pascal (Pa)<\/option><option value=\"kPa\">Kilopascal (kPa)<\/option><option value=\"MPa\">Megapascal (MPa)<\/option><option value=\"bar\">Bar<\/option><option value=\"atm\">Atmosphere (atm)<\/option><option value=\"mmHg\">Millimeter of mercury (mmHg)<\/option><option value=\"cmHg\">Centimeter of mercury (cmHg)<\/option><option value=\"inHg\">Inch of mercury (inHg)<\/option><option value=\"psi\">Pound per square inch (psi)<\/option><option value=\"torr\">Torr<\/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-3\"><label for=\"field-3\">To unit<\/label><div class=\"grid grid-cols-1\"><select id=\"field-3\" name=\"to_unit\"><option value=\"Pa\">Pascal (Pa)<\/option><option value=\"kPa\">Kilopascal (kPa)<\/option><option value=\"MPa\">Megapascal (MPa)<\/option><option value=\"bar\">Bar<\/option><option value=\"atm\">Atmosphere (atm)<\/option><option value=\"mmHg\">Millimeter of mercury (mmHg)<\/option><option value=\"cmHg\">Centimeter of mercury (cmHg)<\/option><option value=\"inHg\">Inch of mercury (inHg)<\/option><option value=\"psi\">Pound per square inch (psi)<\/option><option value=\"torr\">Torr<\/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><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"55872\">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>Converted Pressure<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/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=\"55872\" 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>Pressure Conversion 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\\[P_{\\text{to}}=P_{\\text{from}}\\times\\frac{f_{\\text{from}}}{f_{\\text{to}}}\\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(P_{\\text{from}}\\) \u2014 pressure value in the starting unit<\/li>\n<li>\\(P_{\\text{to}}\\) \u2014 pressure value in the target unit<\/li>\n<li>\\(f_{\\text{from}}\\) \u2014 pascals per starting unit<\/li>\n<li>\\(f_{\\text{to}}\\) \u2014 pascals per target unit<\/li>\n<\/ul>\n<p>The converter first expresses the entered value in pascals, then divides by the number of pascals in one target unit. This changes the unit without changing the pressure represented.<\/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>Pressure \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> convert the default value of 101,325 Pa to atmospheres (atm).<\/p>\n<p>\\[101{,}325\\ \\text{Pa}\\times\\frac{1\\ \\text{Pa\/Pa}}{101{,}325\\ \\text{Pa\/atm}}=1\\ \\text{atm}\\]<\/p>\n<p><strong>Result:<\/strong> 101,325 Pa = 1 atm.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Enter the number you want to convert in <strong>Pressure value<\/strong>. The field accepts zero or a positive value.<\/li>\n<li>Choose the unit of that number under <strong>From unit<\/strong>.<\/li>\n<li>Choose the unit you need under <strong>To unit<\/strong>. You can select any of the listed units, including the same unit as your starting value.<\/li>\n<li>Read <strong>Converted Pressure<\/strong>. The result includes the target unit and is rounded to no more than 10 decimal places.<\/li>\n<\/ol>\n<h2>What pressure units measure<\/h2>\n<p>Pressure describes force distributed over an area: \\(P=F\/A\\). The pascal (Pa), the SI unit of pressure, equals one newton per square meter. A larger pressure means more force acts on each unit of area. If you need to convert a force separately, use the <a href=\"https:\/\/wpcalc.com\/en\/converters\/force\/\">force converter<\/a>; converting pressure alone does not tell you the total force unless the area is known.<\/p>\n<p>Different fields use different pressure units. Kilopascals and megapascals keep large values manageable in engineering calculations; bar and psi are common on equipment specifications. Atmospheres provide a reference based on standard atmospheric pressure: exactly 101,325 Pa per atm. This is a defined reference value, not a claim that local air pressure is always 1 atm.<\/p>\n<p>Mercury-column units appear in weather reports, aviation, vacuum measurements, and blood pressure readings. Millimeters of mercury (mmHg), centimeters of mercury (cmHg), inches of mercury (inHg), and torr are available here. For example, a measurement reported in mmHg can be converted to kPa for comparison with a specification expressed in SI units. Pressure units also matter in gas-solubility calculations; see the <a href=\"https:\/\/wpcalc.com\/en\/converters\/henrys-law\/\">Henry\u2019s Law calculator<\/a> when pressure is one of the inputs to that relationship.<\/p>\n<h2>Conversion factors used<\/h2>\n<p>Each factor below is the number of pascals in one unit. The calculator multiplies by the factor for <strong>From unit<\/strong> and divides by the factor for <strong>To unit<\/strong>.<\/p>\n<table>\n<thead>\n<tr>\n<th>Unit<\/th>\n<th>Pascals per unit<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Pa<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>kPa<\/td>\n<td>1,000<\/td>\n<\/tr>\n<tr>\n<td>MPa<\/td>\n<td>1,000,000<\/td>\n<\/tr>\n<tr>\n<td>bar<\/td>\n<td>100,000<\/td>\n<\/tr>\n<tr>\n<td>atm<\/td>\n<td>101,325<\/td>\n<\/tr>\n<tr>\n<td>mmHg<\/td>\n<td>133.322368<\/td>\n<\/tr>\n<tr>\n<td>cmHg<\/td>\n<td>1,333.22368<\/td>\n<\/tr>\n<tr>\n<td>inHg<\/td>\n<td>3,386.389<\/td>\n<\/tr>\n<tr>\n<td>psi<\/td>\n<td>6,894.757<\/td>\n<\/tr>\n<tr>\n<td>torr<\/td>\n<td>133.322368<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For a quick sense check, 100 kPa equals 1 bar, while 1 atm is slightly higher at 101.325 kPa. Converting in the reverse direction uses the same factors: 1 bar \u00f7 101,325 Pa per atm, after expressing 1 bar as 100,000 Pa, gives approximately 0.9869232667 atm.<\/p>\n<h2>Assumptions and practical limits<\/h2>\n<p>This is a unit converter, not a pressure sensor or a calculator for how pressure changes with height, temperature, or flow. It applies fixed factors to the value you enter. In particular, it does not distinguish <strong>absolute pressure<\/strong> from <strong>gauge pressure<\/strong>. Both can use the same units, but a gauge reading is relative to its reference pressure. If you need to change between gauge and absolute pressure, account for that reference separately before or after converting units.<\/p>\n<p>The calculator uses the same factor for mmHg and torr, so it returns identical values for those units. Definitions and measurement conventions can differ slightly in high-precision work; the listed factors determine this calculator\u2019s results. Likewise, psi and inHg use the rounded factors shown above. Check the required convention if you are working to a tighter tolerance than those factors allow.<\/p>\n<p>The input does not accept negative values. Zero is valid, but its physical meaning depends on whether the original reading is absolute or gauge pressure. For very small converted values, the display\u2019s rounding to 10 decimal places may hide additional nonzero digits; keep that display limit in mind when comparing tiny pressures.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convert a pressure value between Pa, kPa, MPa, bar, atm, mmHg, cmHg, inHg, psi, and torr. Enter the value and select the starting and target units.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[34],"class_list":["post-55872","post","type-post","status-publish","format-standard","hentry","category-converters","tag-physics-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55872","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=55872"}],"version-history":[{"count":3,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55872\/revisions"}],"predecessor-version":[{"id":65303,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55872\/revisions\/65303"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=55872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=55872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=55872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}