{"id":67339,"date":"2026-10-21T09:56:55","date_gmt":"2026-10-21T06:56:55","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=67339"},"modified":"2026-10-21T09:56:55","modified_gmt":"2026-10-21T06:56:55","slug":"significant-figures-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/mathematics\/significant-figures-calculator\/","title":{"rendered":"Significant Figures 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\">Count Significant Figures or Calculate with Sig Fig Rules<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"67339\" data-favorite-title=\"Sig Figs\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/mathematics\/significant-figures-calculator\/\" data-favorite-excerpt=\"Count the significant figures of any number, round it to N sig figs, or add, subtract, multiply and divide two numbers with the correct sig fig rules applied automatically.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-arithmetic\">\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\/mathematics\/significant-figures-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-67339\" data-post=\"67339\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">Mode<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"mode\"><option value=\"count\" selected>Count &amp; round one number<\/option><option value=\"calc\">Calculate with sig figs<\/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-2\"><label for=\"field-2\">Number<\/label><div class=\"term\">x<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"number\" id=\"field-2\" aria-describedby=\"calc-info-2\" placeholder=\"e.g. 0.004050, 1.20e3, 1500 or 1500.\" step=\"any\" value=\"0.004050\"\/><small id=\"calc-info-2\">Integer or decimal (dot or comma as the separator), with an optional exponent such as 1.20e3 or 1.20E3. The written form matters: 1500 has 2 certain significant figures, 1500. has 4, and 1.500e3 has 4.<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Round to N sig figs<\/label><div class=\"term\">N<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"round_to_n_sig_figs\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"20\" value=\"3\"\/><small id=\"calc-info-3\">Round x to this many significant figures (1\u201320); round-half-up is used.<\/small><\/div><div class=\"field has-term\" id=\"input-4\" hidden><label for=\"field-4\">First number<\/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=\"first_number\" id=\"field-4\" aria-describedby=\"calc-info-4\" placeholder=\"e.g. 1500, 4.56 or 2.0e-3\" step=\"any\" value=\"4.56\"\/><small id=\"calc-info-4\">Same formats as in tool 1: written precision counts, so 4.560 has 4 significant figures while 4.56 has 3.<\/small><\/div><div class=\"field has-term\" id=\"input-5\" hidden><label for=\"field-5\">Second number<\/label><div class=\"term\">b<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"second_number\" id=\"field-5\" aria-describedby=\"calc-info-5\" placeholder=\"e.g. 3.20, 0.004 or 6.02e23\" step=\"any\" value=\"1.23\"\/><small id=\"calc-info-5\">The second operand, in the same format.<\/small><\/div><div class=\"field\" id=\"input-6\" hidden><label for=\"field-6\">Operation<\/label><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"operation\"><option value=\"add\">a + b<\/option><option value=\"sub\">a \u2212 b<\/option><option value=\"mul\" selected>a \u00d7 b<\/option><option value=\"div\">a \u00f7 b<\/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=\"67339\">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>Significant figures<\/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>Highlighted digits<\/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\" id=\"output-3\"><span class=\"field-title\"><span>Rounded value (N sig figs)<\/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\" id=\"output-4\"><span class=\"field-title\"><span>Rounded value in scientific notation<\/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>How the figures were counted<\/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 class=\"field-result\" id=\"output-6\"><span class=\"field-title\"><span>Unrounded result<\/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\" id=\"output-7\"><span class=\"field-title\"><span>Result with the correct sig figs<\/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 class=\"field-result\" id=\"output-8\"><span class=\"field-title\"><span>Result in scientific notation<\/span><\/span><span class=\"field-value\" id=\"result-8\"><\/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-9\"><span class=\"field-title\"><span>Rule applied<\/span><\/span><span class=\"field-value\" id=\"result-9\"><\/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=\"67339\" 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>Sig Figs 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\\[ \\text{sig figs of } (a \\times b) \\text{ and } (a \\div b) = \\min\\big(\\text{sig}(a),\\, \\text{sig}(b)\\big) \\\\ \\text{decimal places of } (a + b) \\text{ and } (a - b) = \\min\\big(\\text{d.p.}(a),\\, \\text{d.p.}(b)\\big) \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(\\text{sig}(x)\\) \u2014 number of significant figures of \\(x\\): every digit from the first non-zero digit to the last digit that states precision<\/li>\n<li>\\(\\text{d.p.}(x)\\) \u2014 number of decimal places to which \\(x\\) is written<\/li>\n<li>\\(a\\), \\(b\\) \u2014 the two numbers involved in the calculation<\/li>\n<li>\\(N\\) \u2014 the target number of significant figures (1\u201320)<\/li>\n<\/ul>\n<p>Counting a single number follows simple rules: leading zeros never count, zeros between non-zero digits always count, and a trailing zero counts only when the written form \u2014 a decimal point (as in 1500.) or an exponent (1.500e3) \u2014 shows that it was actually measured. When rounding to \\(N\\) significant figures, the calculator keeps the first \\(N\\) of them and applies round-half-up to the next digit.<\/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>Sig Figs \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example 1 \u2014 Count &amp; round one number:<\/strong> Count the significant figures of 0.004050 and round it to N = 3 sig figs.<\/p>\n<p>\\[ 0.004050 \\;\\Rightarrow\\; 4 \\text{ significant figures} \\]<\/p>\n<p>The zeros in 0.00 merely locate the decimal point; the captive zero and the trailing zero after the decimal point both count. Rounding keeps the first 3 figures and drops the next digit (0):<\/p>\n<p>\\[ 0.004050 \\;\\rightarrow\\; 0.00405 = 4.05 \\times 10^{-3} \\]<\/p>\n<p><strong>Result:<\/strong> 0.004050 has 4 significant figures; rounded to 3 sig figs it is 0.00405.<\/p>\n<p><strong>Example 2 \u2014 Calculate with sig figs:<\/strong> Multiply 4.56 by 1.23.<\/p>\n<p>\\[ 4.56 \\times 1.23 = 5.6088 \\;\\Rightarrow\\; \\min(3,\\, 3) = 3 \\text{ sig figs} \\;\\Rightarrow\\; 5.61 \\]<\/p>\n<p><strong>Result:<\/strong> 5.61 \u2014 the unrounded product is 5.6088, and the next digit (8) rounds the last kept digit up.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Select the <strong>Mode<\/strong>: <em>Count &amp; round one number<\/em> analyses a single value; <em>Calculate with sig figs<\/em> applies the rules to an operation on two numbers.<\/li>\n<li>In count mode, type your value into <strong>Number<\/strong>. Integers and decimals are accepted (dot or comma as the separator), with an optional exponent such as 1.20e3 or 1.20E3. The way the number is written matters: 1500, 1500. and 1.500e3 carry different precision.<\/li>\n<li>Enter <strong>Round to N sig figs<\/strong> (1\u201320). The calculator highlights the significant digits, counts them, and shows the value rounded to N figures in plain and scientific notation, together with a step-by-step explanation.<\/li>\n<li>In calculate mode, fill in <strong>First number<\/strong> and <strong>Second number<\/strong> (same formats as above), then choose the <strong>Operation<\/strong>: a + b, a \u2212 b, a \u00d7 b or a \u00f7 b.<\/li>\n<li>Read the results: the unrounded value, the result with the correct number of significant figures, its scientific notation, and the rule that was applied.<\/li>\n<\/ol>\n<h2>What Are Significant Figures?<\/h2>\n<p>Significant figures (sig figs) are the digits of a number that carry real information about its precision \u2014 every digit known with certainty plus one final estimated digit. If a balance displays 12.30 g, all four digits are meaningful: writing 12.3 g would claim less precision, and 12.300 g would claim more than the instrument can justify. Sig figs are how measurement and calculation results stay honest about what is actually known.<\/p>\n<p>The written form of a number encodes its precision. Leading zeros, as in 0.004050, only locate the decimal point and never count. Zeros between non-zero digits always count, and trailing zeros count when a decimal point or an exponent shows they were measured. That is why 1500 has just 2 certain significant figures \u2014 its trailing zeros may only hold the places \u2014 while 1500. and \\(1.500 \\times 10^{3}\\) both state 4.<\/p>\n<p>The rules matter most in calculations, because a result can never be more precise than the least precise input. Multiplication and division keep the fewest significant figures of the operands, while addition and subtraction keep the fewest decimal places. If the calculator reports a count such as \u201c2 certain (up to 4)\u201d, the number is ambiguous as written; to state the larger precision, add a decimal point or rewrite it with the notation explained in our <a href=\"https:\/\/wpcalc.com\/en\/mathematics\/scientific-notation-calculator\/\">scientific notation calculator<\/a>.<\/p>\n<h2>Counting Rules at a Glance<\/h2>\n<table>\n<thead>\n<tr>\n<th>Number<\/th>\n<th>Sig figs<\/th>\n<th>Why<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0.004050<\/td>\n<td>4<\/td>\n<td>Leading zeros never count; the captive zero and the trailing zero do<\/td>\n<\/tr>\n<tr>\n<td>1500<\/td>\n<td>2 (up to 4)<\/td>\n<td>Without a decimal point the trailing zeros may merely hold the places<\/td>\n<\/tr>\n<tr>\n<td>1500.<\/td>\n<td>4<\/td>\n<td>The decimal point makes the trailing zeros significant<\/td>\n<\/tr>\n<tr>\n<td>1.500e3<\/td>\n<td>4<\/td>\n<td>The exponent preserves the mantissa's full written precision<\/td>\n<\/tr>\n<tr>\n<td>1.20<\/td>\n<td>3<\/td>\n<td>Captive and trailing zeros after the decimal point count<\/td>\n<\/tr>\n<tr>\n<td>6.02e23<\/td>\n<td>3<\/td>\n<td>Only the digits of the mantissa count<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Tips and Limitations<\/h2>\n<ul>\n<li><strong>Round-half-up.<\/strong> The calculator always rounds a deciding 5 upward. Some fields use other conventions (round-half-even), so check which one your course expects; for plain decimal rounding see the <a href=\"https:\/\/wpcalc.com\/en\/mathematics\/rounding-calculator\/\">rounding calculator<\/a>.<\/li>\n<li><strong>Exact numbers do not limit the result.<\/strong> Counted quantities (12 apples) and defined conversions (1 m = 100 cm) are exact, so only measured values reduce the precision of an answer.<\/li>\n<li><strong>Round at the end.<\/strong> For chains of operations, carry full precision through the intermediate steps \u2014 for example in the <a href=\"https:\/\/wpcalc.com\/en\/mathematics\/scientific-calculator\/\">scientific calculator<\/a> \u2014 and apply the sig fig rules once, at the final result.<\/li>\n<li><strong>Zero.<\/strong> Zero has no non-zero digits, so its significant figures are undefined; the calculator mentions this and, by convention, treats zero as an operand with 1 figure.<\/li>\n<li><strong>Input limits.<\/strong> N must be a whole number from 1 to 20, numbers may contain at most 40 digits, and exponents must lie between \u2212100 and 100.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Count the significant figures of any number, round it to N sig figs, or add, subtract, multiply and divide two numbers with the correct sig fig rules applied automatically.<\/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":[7],"tags":[72],"class_list":["post-67339","post","type-post","status-publish","format-standard","hentry","category-mathematics","tag-arithmetic-calculators"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/67339","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=67339"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/67339\/revisions"}],"predecessor-version":[{"id":67340,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/67339\/revisions\/67340"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=67339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=67339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=67339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}