{"id":65849,"date":"2026-10-14T12:07:00","date_gmt":"2026-10-14T06:37:00","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65849"},"modified":"2026-10-14T14:30:50","modified_gmt":"2026-10-14T09:00:50","slug":"compound-interest-calculator","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/compound-interest-calculator\/","title":{"rendered":"Compound Interest Calculator With Monthly Deposits"},"content":{"rendered":"<p>This <strong>compound interest calculator<\/strong> shows how money grows when interest earns interest. 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.qt-cell:disabled{cursor:default} .qt-tool .qt-win{background:#C6F6D5;border-color:#38A169} .qt-tool .qt-sel{background:#BEE3F8;border-color:#3182CE} .qt-tool .qt-bad{background:#FED7D7;border-color:#E53E3E} .qt-tool select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;cursor:pointer;border:2px solid #90B4DA;font-weight:600;background-color:#fff;background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 14 9'%3E%3Cpath d='M1.5 1.5l5.5 5.5 5.5-5.5' fill='none' stroke='%232B6CB0' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'\/%3E%3C\/svg%3E\");background-repeat:no-repeat;background-position:right 14px center;background-size:14px 9px} .qt-tool select:hover{border-color:var(--qt-accent);background-color:#F4F8FD} .qt-tool select::-ms-expand{display:none} .qt-next{margin:0 0 1.75em} .qt-next .qt-next-h{font-size:14px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:#4A5568;margin:0 0 8px} .qt-next-g{display:grid;grid-template-columns:repeat(3,1fr);gap:8px} .qt-next-g a{display:flex;align-items:center;min-height:46px;padding:9px 12px;border:1px solid #AEC3DB;border-radius:8px;background:#F4F8FD;color:#215387;font-weight:600;font-size:15px;line-height:1.3;text-decoration:none} .qt-next-g a:hover,.qt-next-g a:focus{background:#E3EEFF;border-color:#2B6CB0;text-decoration:none} @media (max-width:600px){.qt-next-g{grid-template-columns:repeat(2,1fr)}}<\/style>\n<div class=\"qt-tool\" id=\"qt-ci\">\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-ci-p\">Starting amount<\/label><input type=\"text\" inputmode=\"decimal\" id=\"qt-ci-p\" value=\"10,000\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-ci-m\">Monthly deposit<\/label><input type=\"text\" inputmode=\"decimal\" id=\"qt-ci-m\" value=\"200\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-ci-r\">Interest rate (% per year)<\/label><input type=\"number\" step=\"any\" id=\"qt-ci-r\" value=\"7\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-ci-y\">Years<\/label><input type=\"number\" step=\"1\" min=\"1\" max=\"100\" id=\"qt-ci-y\" value=\"20\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-ci-c\">Compounding<\/label><select id=\"qt-ci-c\"><option value=\"1\">Yearly<\/option><option value=\"4\">Quarterly<\/option><option value=\"12\" selected>Monthly<\/option><option value=\"365\">Daily<\/option><\/select><\/div>\n<div class=\"qt-field\"><label for=\"qt-ci-cur\">Currency<\/label><select id=\"qt-ci-cur\"><option value=\"$|en-US\" selected>$ Dollar<\/option><option value=\"\u20b9|en-IN\">\u20b9 Rupee<\/option><option value=\"\u00a3|en-GB\">\u00a3 Pound<\/option><option value=\"\u20ac|de-DE\">\u20ac Euro<\/option><option value=\"|en-US\">None<\/option><\/select><\/div>\n<\/div>\n<div class=\"qt-stats\">\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-ci-fv\">&#8211;<\/span><span class=\"qt-lab\">Final balance<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-ci-dep\">&#8211;<\/span><span class=\"qt-lab\">Total deposits<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-ci-int\">&#8211;<\/span><span class=\"qt-lab\">Interest earned<\/span><\/div>\n<\/div>\n<div class=\"qt-status\" id=\"qt-ci-status\" aria-live=\"polite\"><\/div>\n<table class=\"qt-table\">\n<thead>\n<tr>\n<th>Year<\/th>\n<th>Deposits<\/th>\n<th>Interest<\/th>\n<th>Balance<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"qt-ci-out\"><\/tbody>\n<\/table>\n<div class=\"qt-row\"><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" id=\"qt-ci-csv\">Copy table (CSV)<\/button><\/div>\n<p class=\"qt-note\">Everything runs in your browser. Nothing you enter is sent to or stored on our server.<\/p>\n<\/div>\n<p><script>(function () { function qtReady(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function qtCopy(text, statusEl, okMsg) { function done(ok) { if (statusEl) { statusEl.textContent = ok ? (okMsg || 'Copied to clipboard.') : 'Press Ctrl+C (or Cmd+C) to copy.'; } } function fallback() { var ta = document.createElement('textarea'); ta.value = text; ta.setAttribute('readonly', ''); ta.style.position = 'fixed'; ta.style.top = '-1000px'; document.body.appendChild(ta); ta.select(); var ok = false; try { ok = document.execCommand('copy'); } catch (e) { ok = false; } document.body.removeChild(ta); done(ok); } if (navigator.clipboard) { if (window.isSecureContext) { navigator.clipboard.writeText(text).then(function () { done(true); }, fallback); return; } } fallback(); } function qtRand32() { var c = window.crypto || window.msCrypto; if (c) { if (c.getRandomValues) { var a = new Uint32Array(1); c.getRandomValues(a); return a[0]; } } return Math.floor(Math.random() * 4294967296); } function qtRandInt(range) { if (range === 4294967296) { return qtRand32(); } var limit = Math.floor(4294967296 \/ range) * range; var x = qtRand32(); while (x >= limit) { x = qtRand32(); } return x % range; } function qtMoney(sel) { var p = (sel ? sel.value : '$|en-US').split('|'); return function (v, d) { if (!isFinite(v)) { return '-'; } var dd = d === undefined ? 2 : d; return (v >= 0 ? '' : '-') + p[0] + Math.abs(v).toLocaleString(p[1], { minimumFractionDigits: dd, maximumFractionDigits: dd }); }; } function qtNum(el) { var v = parseFloat(String(el.value).replace(\/,\/g, '')); return isNaN(v) ? 0 : v; } function qtTd(tr, t, cls) { var e = document.createElement('td'); e.textContent = t; if (cls) { e.className = cls; } tr.appendChild(e); } qtReady(function () { var pEl = document.getElementById('qt-ci-p'); if (!pEl) { return; } function $(id) { return document.getElementById(id); } var csv = []; function upd() { var m = qtMoney($('qt-ci-cur')); var P0 = qtNum(pEl), dep = qtNum($('qt-ci-m')), rate = qtNum($('qt-ci-r')), yrs = Math.round(qtNum($('qt-ci-y'))), c = parseInt($('qt-ci-c').value, 10); var st = $('qt-ci-status'); st.textContent = ''; st.classList.remove('qt-error'); var body = $('qt-ci-out'); body.textContent = ''; csv = ['year,deposits,interest,balance']; if (1 > yrs || yrs > 100) { st.textContent = 'Enter between 1 and 100 years.'; st.classList.add('qt-error'); return; } var mr = Math.pow(1 + rate \/ 100 \/ c, c \/ 12) - 1; var bal = P0, totDep = P0, totInt = 0; for (var y = 1; yrs >= y; y++) { var yi = 0, yd = 0; for (var k = 0; 12 > k; k++) { var i = bal * mr; bal += i; yi += i; bal += dep; yd += dep; } totDep += yd; totInt += yi; var tr = document.createElement('tr'); qtTd(tr, String(y)); qtTd(tr, m(totDep, 0)); qtTd(tr, m(totInt, 0)); qtTd(tr, m(bal, 0)); body.appendChild(tr); csv.push(y + ',' + totDep.toFixed(2) + ',' + totInt.toFixed(2) + ',' + bal.toFixed(2)); } $('qt-ci-fv').textContent = m(bal, 0); $('qt-ci-dep').textContent = m(totDep, 0); $('qt-ci-int').textContent = m(totInt, 0); var eff = (Math.pow(1 + rate \/ 100 \/ c, c) - 1) * 100; st.textContent = 'Effective yearly rate (APY): ' + eff.toFixed(2) + '%.' + (rate > 0 ? ' At this rate money doubles in about ' + (Math.log(2) \/ Math.log(1 + eff \/ 100)).toFixed(1) + ' years.' : ''); } ['qt-ci-p', 'qt-ci-m', 'qt-ci-r', 'qt-ci-y'].forEach(function (id) { $(id).addEventListener('input', upd); }); ['qt-ci-c', 'qt-ci-cur'].forEach(function (id) { $(id).addEventListener('change', upd); }); $('qt-ci-csv').addEventListener('click', function () { qtCopy(csv.join('\\n'), $('qt-ci-status'), 'Table copied.'); }); upd(); }); })();<\/script><\/p>\n<div class=\"qt-next\">\n<p class=\"qt-next-h\">Try another free tool<\/p>\n<div class=\"qt-next-g\"><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/loan-calculator\/\">Loan and EMI Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/discount-calculator\/\">Discount Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/sales-tax-calculator\/\">Sales Tax and GST Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/salary-calculator\/\">Salary to Hourly Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">Days Between Dates<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\">Age Calculator<\/a><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> $10,000 plus $200 a month at 7% compounded monthly grows to about $144,000 after 20 years. You put in $58,000; the other $86,000 or so is interest.<\/p>\n<h2>How to use the compound interest calculator<\/h2>\n<ol>\n<li>Enter your <strong>starting amount<\/strong> (use 0 if you are starting from nothing) and how much you will add <strong>each month<\/strong>.<\/li>\n<li>Enter the expected <strong>yearly interest rate<\/strong> or return and the number of <strong>years<\/strong>.<\/li>\n<li>Choose how often interest is <strong>compounded<\/strong>. Savings accounts often compound daily or monthly; many bonds and fixed deposits compound quarterly or yearly.<\/li>\n<li>Read the final balance and the table to see how the interest snowballs in later years.<\/li>\n<\/ol>\n<h2>The compound interest formula<\/h2>\n<p>For a single deposit: <strong>A = P (1 + r\/n)<sup>nt<\/sup><\/strong>, where P is the starting amount, r the yearly rate as a decimal, n the number of times interest is compounded per year and t the number of years. With monthly deposits, each deposit grows for the months that remain. This calculator adds deposits at the end of each month and converts the compounding to an equivalent monthly rate, which is how most banks quote it.<\/p>\n<h2>Simple vs compound interest<\/h2>\n<p>Simple interest is paid only on the original amount. Compound interest is paid on the amount plus all interest so far, so growth speeds up over time. $10,000 at 7% simple interest earns $14,000 in 20 years; compounded yearly it earns about $28,700.<\/p>\n<h2>The rule of 72<\/h2>\n<p>Divide 72 by the yearly rate to estimate how many years it takes to double your money. At 6% that is about 12 years; at 9%, about 8 years. The status line under the results shows the exact doubling time.<\/p>\n<table class=\"qt-ref\">\n<thead>\n<tr>\n<th>Rate<\/th>\n<th>Years to double<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>3%<\/td>\n<td>23.4<\/td>\n<\/tr>\n<tr>\n<td>5%<\/td>\n<td>14.2<\/td>\n<\/tr>\n<tr>\n<td>7%<\/td>\n<td>10.2<\/td>\n<\/tr>\n<tr>\n<td>10%<\/td>\n<td>7.3<\/td>\n<\/tr>\n<tr>\n<td>12%<\/td>\n<td>6.1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Returns on stocks and funds go up and down, and this tool does not include taxes, fees or inflation. Treat the result as an estimate, not financial advice. To work out loan payments instead, use the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/loan-calculator\/\">loan calculator<\/a>; to convert pay between hourly and yearly, use the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/salary-calculator\/\">salary calculator<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>What is APY?<\/h3>\n<p>Annual percentage yield is the real yearly growth after compounding. 5% compounded monthly is an APY of 5.12%.<\/p>\n<h3>Does daily compounding make a big difference?<\/h3>\n<p>Only a little over monthly compounding. The rate, the time and how much you add each month matter far more.<\/p>\n<h3>Can I use this for a SIP?<\/h3>\n<p>Yes. Set the starting amount to 0, enter your monthly SIP amount and an expected return.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/loan-calculator\/\"><strong>Loan and EMI Calculator<\/strong><span>Monthly payment, total interest and schedule.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/discount-calculator\/\"><strong>Discount Calculator<\/strong><span>Sale price and savings after a percentage off.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/sales-tax-calculator\/\"><strong>Sales Tax and GST Calculator<\/strong><span>Add or remove tax, VAT or GST from a price.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/salary-calculator\/\"><strong>Salary to Hourly Calculator<\/strong><span>Convert hourly, weekly, monthly and yearly pay.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\"><strong>Days Between Dates<\/strong><span>Count days, weeks and business days between two dates.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\"><strong>Age Calculator<\/strong><span>Your exact age in years, months and days, plus next birthday.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/percentage-calculator\/\"><strong>Percentage Calculator<\/strong><span>Work out X% of Y, percent change and more.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\"><strong>Stopwatch and Timer<\/strong><span>Online stopwatch with laps and a countdown timer with alarm.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/average-calculator\/\"><strong>Average Calculator<\/strong><span>Mean, median, mode and range of a list of numbers.<\/span><\/a><\/div>\n<p>See all of them on the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/\">QuickOnlineTips free online tools<\/a> page and play our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/games\/\">free online games<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This compound interest calculator shows how money grows when interest earns interest. Enter a starting amount, a monthly deposit, a yearly rate and a number of years, and see the final balance, how much came from your deposits and how much from interest, with a year-by-year table. Starting amount Monthly deposit Interest rate (% per&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":65595,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65849","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65849","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=65849"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65849\/revisions"}],"predecessor-version":[{"id":66450,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65849\/revisions\/66450"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}