{"id":11881,"date":"2024-04-10T11:42:20","date_gmt":"2024-04-10T09:42:20","guid":{"rendered":"https:\/\/new.rls-wacon.de\/water-hardness-calculator\/"},"modified":"2026-09-16T12:59:28","modified_gmt":"2026-09-16T10:59:28","slug":"water-hardness-calculator","status":"publish","type":"page","link":"https:\/\/rls-wacon.de\/en\/water-hardness-calculator\/","title":{"rendered":"Water hardness calculator"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"11881\" class=\"elementor elementor-11881 elementor-10114\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9cf2426 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"9cf2426\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d8e4a91\" data-id=\"d8e4a91\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-57201fb elementor-widget elementor-widget-shortcode\" data-id=\"57201fb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">  <div class=\"rls-whr\" data-lang=\"en\">\n        <header class=\"whr-hero\">\n      <div class=\"whr-w\">\n        <span class=\"whr-eb\">\u2014 All units at a glance<\/span>\n        <h1>Water Hardness Calculator<\/h1>\n        <p class=\"whr-lead\">Convert your reading between all units in seconds \u2014 \u00b0dH, \u00b0e, ppm CaCO\u2083, grains per gallon, mmol\/l and mval\/l. Also for carbonate hardness, phosphate, sulfite, nitrate, ammonium and conductivity.<\/p>\n      <\/div>\n      <div class=\"whr-wave\" aria-hidden=\"true\"><svg viewBox=\"0 0 1000 100\" preserveAspectRatio=\"none\"><path d=\"M421.9,6.5c22.6-2.5,51.5,0.4,75.5,5.3c23.6,4.9,70.9,23.5,100.5,35.7c75.8,32.2,133.7,44.5,192.6,49.7c23.6,2.1,48.7,3.5,103.4-2.5c54.7-6,106.2-25.6,106.2-25.6V0H0v30.3c0,0,72,32.6,158.4,30.5c39.2-0.7,92.8-6.7,134-22.4c21.2-8.1,52.2-18.2,79.7-24.2C399.3,7.9,411.6,7.5,421.9,6.5z\"><\/path><\/svg><\/div>\n    <\/header>\n    \n    <div class=\"whr-w whr-main\">\n\n      <section class=\"whr-tool\" aria-label=\"Water Hardness Calculator\">\n        <span class=\"whr-lbl whr-steplbl\"><span class=\"whr-step\">1<\/span>Parameter<\/span>\n        <div class=\"whr-pills\" role=\"group\" aria-label=\"\u2014 All units at a glance\">\n                      <button type=\"button\" class=\"whr-pill is-on\" data-param=\"gesamt\" aria-pressed=\"true\">Total hardness<\/button>\n                      <button type=\"button\" class=\"whr-pill\" data-param=\"carbonat\" aria-pressed=\"false\">Carbonate hardness<\/button>\n                      <button type=\"button\" class=\"whr-pill\" data-param=\"phosphat\" aria-pressed=\"false\">Phosphate<\/button>\n                      <button type=\"button\" class=\"whr-pill\" data-param=\"sulfit\" aria-pressed=\"false\">Sulfite<\/button>\n                      <button type=\"button\" class=\"whr-pill\" data-param=\"nitrat\" aria-pressed=\"false\">Nitrate<\/button>\n                      <button type=\"button\" class=\"whr-pill\" data-param=\"ammonium\" aria-pressed=\"false\">Ammonium<\/button>\n                      <button type=\"button\" class=\"whr-pill\" data-param=\"leitfaehigkeit\" aria-pressed=\"false\">Conductivity<\/button>\n                  <\/div>\n\n        <div class=\"whr-inrow\">\n          <label class=\"whr-field\" for=\"whrVal\">\n            <span class=\"whr-lbl\"><span class=\"whr-step\">2<\/span>Enter value<\/span>\n            <input id=\"whrVal\" type=\"text\" inputmode=\"decimal\" autocomplete=\"off\" value=\"100\">\n          <\/label>\n          <label class=\"whr-field\" for=\"whrUnit\">\n            <span class=\"whr-lbl\"><span class=\"whr-step\">3<\/span>Unit<\/span>\n            <span class=\"whr-selwrap\"><select id=\"whrUnit\">\n              <option value=\"0\">ppm CaCO\u2083<\/option><option value=\"1\">\u00b0dH<\/option><option value=\"2\">\u00b0e<\/option><option value=\"3\">gpg<\/option><option value=\"4\">mmol\/l<\/option><option value=\"5\">mval\/l<\/option>            <\/select><\/span>\n          <\/label>\n        <\/div>\n\n        <span class=\"whr-lbl whr-steplbl\"><span class=\"whr-step\">4<\/span>Result<\/span>\n        <div class=\"whr-scale\" id=\"whrScale\">\n          <div class=\"whr-scale-track\" role=\"img\" aria-label=\"Hardness:\">\n            <span class=\"whr-zone z1\" style=\"flex:17\"><\/span><span class=\"whr-zone z2\" style=\"flex:43\"><\/span><span class=\"whr-zone z3\" style=\"flex:60\"><\/span><span class=\"whr-zone z4\" style=\"flex:60\"><\/span><span class=\"whr-zone z5\" style=\"flex:70\"><\/span>            <span class=\"whr-marker\" id=\"whrMarker\" style=\"left:40%\"><\/span>\n          <\/div>\n          <div class=\"whr-scale-labels\"><span style=\"flex:17\">very soft<\/span><span style=\"flex:43\">soft<\/span><span style=\"flex:60\">moderately hard<\/span><span style=\"flex:60\">hard<\/span><span style=\"flex:70\">very hard<\/span><\/div>\n          <div class=\"whr-range\" id=\"whrRange\" aria-live=\"polite\">Hardness: <b>moderately hard<\/b><\/div>\n        <\/div>\n\n        <div class=\"whr-res\" id=\"whrRes\">\n                      <div class=\"whr-row is-input\">\n              <span class=\"rn\">US grade \/ ppm <span class=\"tag\">Your value<\/span><\/span>\n              <span class=\"rv\">100<\/span>\n              <span class=\"ru\">ppm CaCO\u2083<\/span>\n            <\/div>\n                      <div class=\"whr-row\">\n              <span class=\"rn\">German degree<\/span>\n              <span class=\"rv\">5.6029<\/span>\n              <span class=\"ru\">\u00b0dH<\/span>\n            <\/div>\n                      <div class=\"whr-row\">\n              <span class=\"rn\">Clark \/ English degree<\/span>\n              <span class=\"rv\">7.0154<\/span>\n              <span class=\"ru\">\u00b0e<\/span>\n            <\/div>\n                      <div class=\"whr-row\">\n              <span class=\"rn\">Grains per US gallon<\/span>\n              <span class=\"rv\">5.8426<\/span>\n              <span class=\"ru\">gpg<\/span>\n            <\/div>\n                      <div class=\"whr-row\">\n              <span class=\"rn\">Alkaline-earth ions<\/span>\n              <span class=\"rv\">0.999<\/span>\n              <span class=\"ru\">mmol\/l<\/span>\n            <\/div>\n                      <div class=\"whr-row\">\n              <span class=\"rn\">Alkaline-earth ions<\/span>\n              <span class=\"rv\">1.9983<\/span>\n              <span class=\"ru\">mval\/l<\/span>\n            <\/div>\n                  <\/div>\n\n        <p class=\"whr-note\">Results without warranty \u00b7 The scale follows the common mg\/L CaCO\u2083 classification (for orientation).<\/p>\n      <\/section>\n\n      <section class=\"whr-steck\" aria-label=\"Parameter profile\">\n        <div class=\"whr-steck-head\">\n          <span class=\"peb\">Parameter profile<\/span>\n          <h2 id=\"stTitle\">Total hardness<\/h2>\n          <p class=\"whr-steck-lead\" id=\"stLead\">The sum of calcium and magnesium ions \u2014 the key value against limescale.<\/p>\n        <\/div>\n        <div class=\"whr-steck-grid\">\n          <dl class=\"whr-facts\" id=\"stFacts\">\n            <div class=\"whr-fact\"><dt>Definition<\/dt><dd>Total hardness is the sum of the dissolved calcium and magnesium ions. It is stated in \u00b0dH, ppm CaCO\u2083 (mg\/L) or grains per gallon (gpg): 1 \u00b0dH = 17.8 ppm CaCO\u2083 = 1.04 gpg.<\/dd><\/div><div class=\"whr-fact\"><dt>Why it matters<\/dt><dd>Hardness is the key value for scale protection: on heating, calcium carbonate precipitates as limescale in boilers, heat exchangers, tanks and pipes, lowering efficiency and raising energy and maintenance costs.<\/dd><\/div><div class=\"whr-fact\"><dt>Where measured<\/dt><dd>At the inlet (raw-water hardness), downstream of the softener (residual-hardness check) and continuously in boiler and cooling water.<\/dd><\/div><div class=\"whr-fact\"><dt>Typical values<\/dt><dd>Tap water ranges roughly 60\u2013400 ppm CaCO\u2083 (soft to very hard). Softened boiler feed water should reach a residual hardness near 0.<\/dd><\/div><div class=\"whr-fact\"><dt>Measurement<\/dt><dd>Drop-by-drop titration, pass\/fail limit test or continuous online analysis (SYCON \/ LIMES).<\/dd><\/div><div class=\"whr-fact\"><dt>Good to know<\/dt><dd>Carbonate hardness is the part of total hardness that precipitates on heating \u2014 both values are usually considered together.<\/dd><\/div>          <\/dl>\n          <div class=\"whr-steck-prod\">\n            <span class=\"peb\">Matching products<\/span>\n            <div class=\"whr-plist\" id=\"whrProd\">\n                              <a class=\"whr-prow\" href=\"https:\/\/rls-wacon.de\/en\/produkt\/sycon-2802\/\" target=\"_blank\" rel=\"noopener\">\n                  <span class=\"whr-prow-img\"><img decoding=\"async\" src=\"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/03\/Sycon-2802-im-Gehaeuse-2.png\" alt=\"SYCON 2802\" loading=\"lazy\"><\/span>\n                  <span class=\"whr-prow-tx\"><span class=\"peb\">Online analysis<\/span><span class=\"whr-prow-n\">SYCON 2802<\/span><\/span>\n                  <span class=\"whr-prow-cta\" aria-hidden=\"true\">\u2192<\/span>\n                <\/a>\n                              <a class=\"whr-prow\" href=\"https:\/\/rls-wacon.de\/en\/produkt\/caldur-total-hardness-gh-titration\/\" target=\"_blank\" rel=\"noopener\">\n                  <span class=\"whr-prow-img\"><img decoding=\"async\" src=\"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/04\/31-07132020-20Testset20Gesamthaerte20GH.jpg\" alt=\"Caldur\u00ae Total hardness GH\" loading=\"lazy\"><\/span>\n                  <span class=\"whr-prow-tx\"><span class=\"peb\">Test kit \u00b7 titration<\/span><span class=\"whr-prow-n\">Caldur\u00ae Total hardness GH<\/span><\/span>\n                  <span class=\"whr-prow-cta\" aria-hidden=\"true\">\u2192<\/span>\n                <\/a>\n                              <a class=\"whr-prow\" href=\"https:\/\/rls-wacon.de\/en\/produkt\/haertekontrollgeraet-limes\/\" target=\"_blank\" rel=\"noopener\">\n                  <span class=\"whr-prow-img\"><img decoding=\"async\" src=\"https:\/\/rls-wacon.de\/wp-content\/uploads\/2023\/03\/LIMES-Base.png\" alt=\"LIMES hardness monitor\" loading=\"lazy\"><\/span>\n                  <span class=\"whr-prow-tx\"><span class=\"peb\">Indicator (device)<\/span><span class=\"whr-prow-n\">LIMES hardness monitor<\/span><\/span>\n                  <span class=\"whr-prow-cta\" aria-hidden=\"true\">\u2192<\/span>\n                <\/a>\n                          <\/div>\n          <\/div>\n        <\/div>\n      <\/section>\n\n            <section class=\"whr-info\">\n                  <h2>The RLS Wacon water hardness calculator<\/h2>\n          <p>This tool converts your reading between all common units in seconds \u2014 for total and carbonate hardness plus the boiler-water parameters phosphate, sulfite, nitrate, ammonium and conductivity. Choose a parameter, enter your value and unit, and you instantly get every unit, the hardness category and the right measurement method and products.<\/p>\n                  <h2>Units &amp; conversion<\/h2>\n          <p>Rule of thumb: <b>1 \u00b0dH = 17.8 ppm CaCO\u2083 = 1.04 gpg = 1.78 \u00b0f = 1.25 \u00b0e = 0.178 mmol\/l<\/b>. Reconcile manufacturer, lab and water-utility figures on a single scale.<\/p>\n              <\/section>\n      \n    <\/div>\n    <div class=\"whr-foot\"><div class=\"whr-foot-wave\" aria-hidden=\"true\"><svg viewBox=\"0 0 1000 100\" preserveAspectRatio=\"none\"><path d=\"M421.9,6.5c22.6-2.5,51.5,0.4,75.5,5.3c23.6,4.9,70.9,23.5,100.5,35.7c75.8,32.2,133.7,44.5,192.6,49.7c23.6,2.1,48.7,3.5,103.4-2.5c54.7-6,106.2-25.6,106.2-25.6V0H0v30.3c0,0,72,32.6,158.4,30.5c39.2-0.7,92.8-6.7,134-22.4c21.2-8.1,52.2-18.2,79.7-24.2C399.3,7.9,411.6,7.5,421.9,6.5z\"><\/path><\/svg><\/div><\/div>  <\/div>\n  <script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Water Hardness Calculator\",\"url\":\"https:\/\/rls-wacon.de\/en\/water-hardness-calculator\/\",\"applicationCategory\":\"UtilitiesApplication\",\"operatingSystem\":\"Web\",\"description\":\"Convert your reading between all units in seconds \u2014 \u00b0dH, \u00b0e, ppm CaCO\u2083, grains per gallon, mmol\/l and mval\/l. 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Use our water hardness calculator to easily convert your water hardness into \u00b0dH, \u00b0f, \u00b0e, ppm, mval\/l and mol\/l. Total hardness Carbonate hardness Phosphate Sulfite 1. enter value 2. select unit &amp;degdH&amp;degf&amp;degeppm CaCO3mmol\/lmval\/l 3. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_yoast_wpseo_title":"Water Hardness Calculator: \u00b0dH, ppm & gpg | RLS Wacon","_yoast_wpseo_metadesc":"Convert water hardness online \u2013 total & carbonate hardness, phosphate, sulfite and more between \u00b0dH, ppm CaCO\u2083, gpg, \u00b0f and mmol\/l. 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