{"id":67399,"date":"2026-10-21T10:16:42","date_gmt":"2026-10-21T07:16:42","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=67399"},"modified":"2026-10-21T10:16:42","modified_gmt":"2026-10-21T07:16:42","slug":"child-height-predictor-how-tall-will-my-child-be","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/pregnancy-baby\/child-height-predictor-how-tall-will-my-child-be\/","title":{"rendered":"Child Height Predictor \u2013 How Tall Will My Child Be"},"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\">Estimate Your Child&#039;s Adult Height<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"67399\" data-favorite-title=\"Height Predictor\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/child-height-predictor-how-tall-will-my-child-be\/\" data-favorite-excerpt=\"Estimates your child&#039;s adult height using three methods: mid-parental height, Khamis\u2013Roche (ages 4\u201317), and the double-height-at-age-2 rule. Enter the parents&#039; heights, the child&#039;s sex, age, height and weight to see the predictions.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-children\">\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\/pregnancy-baby\/child-height-predictor-how-tall-will-my-child-be\/\" method=\"POST\" class=\"calculator\" id=\"calculator-67399\" data-post=\"67399\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">Height units<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"height_units\"><option value=\"cm\" selected>Centimetres (cm)<\/option><option value=\"ftin\">Feet and inches (ft + 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 class=\"is-single field\" id=\"input-2\"><span class=\"font-semibold\">Parents&#039; heights<\/span><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Mother&#039;s height<\/label><div class=\"term\">M<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"mothers_height\" id=\"field-3\" aria-describedby=\"calc-unit-3 calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"100\" max=\"250\" value=\"164\"\/><div class=\"unit\" id=\"calc-unit-3\">cm<\/div><small id=\"calc-info-3\">Measured without shoes.<\/small><\/div><div class=\"field\" id=\"input-4\" hidden><label for=\"field-4\">Mother&#039;s height: feet<\/label><input type=\"text\" name=\"mothers_height_feet\" id=\"field-4\" aria-describedby=\"calc-unit-4\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"8\" value=\"5\"\/><div class=\"unit\" id=\"calc-unit-4\">ft<\/div><\/div><div class=\"field\" id=\"input-5\" hidden><label for=\"field-5\">Mother&#039;s height: inches<\/label><input type=\"text\" name=\"mothers_height_inches\" id=\"field-5\" aria-describedby=\"calc-unit-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" max=\"11\" value=\"4\"\/><div class=\"unit\" id=\"calc-unit-5\">in<\/div><\/div><div class=\"field has-term\" id=\"input-6\"><label for=\"field-6\">Father&#039;s height<\/label><div class=\"term\">F<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"fathers_height\" id=\"field-6\" aria-describedby=\"calc-unit-6 calc-info-6\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"100\" max=\"250\" value=\"178\"\/><div class=\"unit\" id=\"calc-unit-6\">cm<\/div><small id=\"calc-info-6\">Measured without shoes.<\/small><\/div><div class=\"field\" id=\"input-7\" hidden><label for=\"field-7\">Father&#039;s height: feet<\/label><input type=\"text\" name=\"fathers_height_feet\" id=\"field-7\" aria-describedby=\"calc-unit-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"8\" value=\"5\"\/><div class=\"unit\" id=\"calc-unit-7\">ft<\/div><\/div><div class=\"field\" id=\"input-8\" hidden><label for=\"field-8\">Father&#039;s height: inches<\/label><input type=\"text\" name=\"fathers_height_inches\" id=\"field-8\" aria-describedby=\"calc-unit-8\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" max=\"11\" value=\"10\"\/><div class=\"unit\" id=\"calc-unit-8\">in<\/div><\/div><div class=\"is-single field\" id=\"input-9\"><span class=\"font-semibold\">Child&#039;s details<\/span><\/div><div class=\"field\" id=\"input-10\"><label for=\"field-10\">Child&#039;s sex<\/label><div class=\"grid grid-cols-1\"><select id=\"field-10\" name=\"childs_sex\"><option value=\"boy\" selected>Boy<\/option><option value=\"girl\">Girl<\/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-11\"><label for=\"field-11\">Age<\/label><div class=\"term\">A<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"age\" id=\"field-11\" aria-describedby=\"calc-unit-11 calc-info-11\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"19\" value=\"6\"\/><div class=\"unit\" id=\"calc-unit-11\">years<\/div><small id=\"calc-info-11\">In years (e.g. 4.5). Needed for the Khamis\u2013Roche method (ages 4\u201317) and the doubling rule (age 2 for boys, 18 months for girls).<\/small><\/div><div class=\"field has-term\" id=\"input-12\"><label for=\"field-12\">Current 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><input type=\"text\" name=\"current_height\" id=\"field-12\" aria-describedby=\"calc-unit-12 calc-info-12\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"50\" max=\"220\" value=\"116\"\/><div class=\"unit\" id=\"calc-unit-12\">cm<\/div><small id=\"calc-info-12\">Standing height without shoes. Needed for the Khamis\u2013Roche and doubling methods.<\/small><\/div><div class=\"field\" id=\"input-13\" hidden><label for=\"field-13\">Current height: feet<\/label><input type=\"text\" name=\"current_height_feet\" id=\"field-13\" aria-describedby=\"calc-unit-13\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"7\" value=\"3\"\/><div class=\"unit\" id=\"calc-unit-13\">ft<\/div><\/div><div class=\"field\" id=\"input-14\" hidden><label for=\"field-14\">Current height: inches<\/label><input type=\"text\" name=\"current_height_inches\" id=\"field-14\" aria-describedby=\"calc-unit-14\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" max=\"11\" value=\"10\"\/><div class=\"unit\" id=\"calc-unit-14\">in<\/div><\/div><div class=\"field has-term\" id=\"input-15\"><label for=\"field-15\">Current 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=\"current_weight\" id=\"field-15\" aria-describedby=\"calc-info-15\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"3\" max=\"200\" value=\"20.5\"\/><div class=\"grid grid-cols-1\"><select id=\"field-16\" 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><small id=\"calc-info-15\">Used by the Khamis\u2013Roche method.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"67399\">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 Child&#039;s Predicted Adult Height<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Method 1 \u2014 Mid-parental height<\/span><span class=\"result-term\">MPH<\/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 class=\"field-result is-column\" id=\"output-2\"><span class=\"field-title\"><span>Method 2 \u2014 Khamis\u2013Roche (ages 4\u201317)<\/span><span class=\"result-term\">KR<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/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-3\"><span class=\"field-title\"><span>Method 3 \u2014 Double height at age 2 (boys) \/ 18 months (girls)<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/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>All methods at a glance<\/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 class=\"field-result is-column\" id=\"output-5\"><span class=\"field-title\"><span>About these estimates<\/span><\/span><span class=\"field-value\" id=\"result-5\"><\/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=\"67399\" 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>Height Predictor 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\\[ H_{\\text{mid}} = \\frac{M + F \\pm 13}{2} \\quad \\text{(add 13 for a boy, subtract 13 for a girl)} \\\\ H_{\\text{adult}} = a_0 + a_1 H + a_2 W + a_3 \\cdot \\frac{M + F}{2} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(M\\) \u2014 mother's height (cm)<\/li>\n<li>\\(F\\) \u2014 father's height (cm)<\/li>\n<li>\\(H_{\\text{mid}}\\) \u2014 mid-parental target height (cm)<\/li>\n<li>\\(H\\) \u2014 child's current standing height (cm)<\/li>\n<li>\\(W\\) \u2014 child's current weight (kg)<\/li>\n<li>\\(a_0, a_1, a_2, a_3\\) \u2014 age- and sex-specific coefficients of the Khamis\u2013Roche method (valid for ages 4\u201317)<\/li>\n<\/ul>\n<p>The first equation is the mid-parental (target height) rule: it estimates the genetic potential from the parents' heights alone, with a 13 cm adjustment for sex. The second is the Khamis\u2013Roche equation, which refines the prediction by adding the child's own stature and weight to the parents' average height.<\/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>Height Predictor \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a 6-year-old boy is 116 cm tall and weighs 20.5 kg; his mother is 164 cm and his father is 178 cm tall.<\/p>\n<p>Mid-parental height:<\/p>\n<p>\\[ H_{\\text{mid}} = \\frac{164 + 178 + 13}{2} = \\frac{355}{2} = 177.5 \\text{ cm} \\]<\/p>\n<p>Khamis\u2013Roche (coefficients for a 6-year-old boy: \\(a_0 = -3.4\\), \\(a_1 = 0.50\\), \\(a_2 = 0.130\\), \\(a_3 = 0.70\\)):<\/p>\n<p>\\[ H_{\\text{adult}} = -3.4 + 0.50 \\times 116 + 0.130 \\times 20.5 + 0.70 \\times 171 \\approx 177.0 \\text{ cm} \\]<\/p>\n<p><strong>Result:<\/strong> both methods predict an adult height of about 177\u2013177.5 cm (roughly 5 ft 10 in), with a realistic mid-parental range of about 169\u2013186 cm. The doubling rule does not apply here because the boy is older than 2 years.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Select the <strong>Height units<\/strong> \u2014 centimetres or feet and inches. All heights are entered in the units you choose.<\/li>\n<li>Enter the <strong>Mother's height<\/strong> and <strong>Father's height<\/strong>, measured without shoes.<\/li>\n<li>Select the <strong>Child's sex<\/strong> \u2014 boy or girl.<\/li>\n<li>Enter the <strong>Age<\/strong> in years (for example, 4.5 for 4 years and 6 months). The age is required for the Khamis\u2013Roche method and the doubling rule.<\/li>\n<li>Enter the child's <strong>Current height<\/strong>, measured standing, without shoes.<\/li>\n<li>Enter the <strong>Current weight<\/strong> and pick its <strong>Unit<\/strong> (kg or lb). Weight is used only by the Khamis\u2013Roche method.<\/li>\n<\/ol>\n<p>The results appear in three blocks \u2014 one per method \u2014 followed by a comparison table and notes. If a method does not apply to your child's age, the calculator explains why.<\/p>\n<h2>How tall will my child be?<\/h2>\n<p>Adult height is largely genetic: studies suggest that roughly 60\u201380% of the variation between people is inherited from their parents. That is why the parents' heights alone give a useful first estimate. The mid-parental method averages the parents' heights and adds 13 cm for a boy (or subtracts 13 cm for a girl), producing the child's genetic <em>target height<\/em>. Most children \u2014 about 90% \u2014 end up within \u00b18.5 cm of this target, so the range matters as much as the single number.<\/p>\n<p>The mid-parental method knows nothing about the child, however. Two siblings with the same parents can follow very different growth paths. The Khamis\u2013Roche method improves on this by combining the child's own height and weight with the parents' average height through age- and sex-specific coefficients. It typically predicts adult height within about 2\u20133 cm before puberty, though during puberty the error can grow to 5\u20138 cm because children start and finish their growth spurt at different times.<\/p>\n<p>A third, simpler rule of thumb: boys reach roughly half of their adult height by age 2, and girls by about 18 months. Doubling the height measured at that age gives a rough adult estimate. It is a folk guideline rather than a validated clinical method, but it often lands surprisingly close to the other two approaches.<\/p>\n<h3>The three methods at a glance<\/h3>\n<table>\n<thead>\n<tr>\n<th>Method<\/th>\n<th>Uses<\/th>\n<th>Best for<\/th>\n<th>Typical accuracy<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Mid-parental height<\/td>\n<td>Parents' heights only<\/td>\n<td>Any age, including toddlers<\/td>\n<td>\u00b18.5 cm (90% range)<\/td>\n<\/tr>\n<tr>\n<td>Khamis\u2013Roche<\/td>\n<td>Child's height, weight, parents' heights<\/td>\n<td>Ages 4\u201317<\/td>\n<td>\u2248 2\u20138 cm<\/td>\n<\/tr>\n<tr>\n<td>Double height at 2 (boys) \/ 18 months (girls)<\/td>\n<td>One measurement at that age<\/td>\n<td>A quick sanity check<\/td>\n<td>Rough guideline only<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Assumptions, limitations and practical tips<\/h2>\n<ul>\n<li><strong>Measure standing, without shoes.<\/strong> A height taken lying down (the usual way for infants) runs about 0.7 cm longer than standing height.<\/li>\n<li><strong>Interpret the range, not the single number.<\/strong> An 8\u20139 cm spread above and below the prediction is completely normal.<\/li>\n<li><strong>Puberty timing shifts predictions.<\/strong> Early developers finish growing sooner and may already be close to their predicted height at 12\u201313; late developers can still grow well past 16.<\/li>\n<li><strong>Special cases reduce accuracy.<\/strong> Very premature birth, chronic illness, malnutrition, or hormonal conditions can push a child off the genetic track predicted from the parents.<\/li>\n<li><strong>One measurement is never a trend.<\/strong> A pediatrician plotting height on a growth chart over several years is far more informative than a one-time formula.<\/li>\n<\/ul>\n<p>If your child's current height is far outside the mid-parental range, or if they are crossing percentiles up or down on a growth chart, bring the measurements to your pediatrician. To put today's result in context, you can also check your child's measurements against a <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/childs-height-and-weight-chart\/\">child's height and weight chart<\/a>, look at how fast they are growing with the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/infant-growth-velocity-calculator\/\">infant growth velocity calculator<\/a>, or follow their overall milestones with the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/child-development-tracker\/\">child development tracker<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Estimates your child's adult height using three methods: mid-parental height, Khamis\u2013Roche (ages 4\u201317), and the double-height-at-age-2 rule. Enter the parents' heights, the child's sex, age, height and weight to see the predictions.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[45],"tags":[18],"class_list":["post-67399","post","type-post","status-publish","format-standard","hentry","category-pregnancy-baby","tag-baby-growth-genetics"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/67399","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=67399"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/67399\/revisions"}],"predecessor-version":[{"id":67400,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/67399\/revisions\/67400"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=67399"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=67399"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=67399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}