Future value
144,572.72
Effective annual rate 7.23%
Total deposited
58,000.00
Total interest
86,572.72
Contributions
48,000.00
| Year | Start balance | Contributions | Interest | End balance |
|---|---|---|---|---|
| 1 | 10,000.00 | 2,400.00 | 801.42 | 13,201.42 |
| 2 | 13,201.42 | 2,400.00 | 1,032.85 | 16,634.27 |
| 3 | 16,634.27 | 2,400.00 | 1,281.01 | 20,315.28 |
| 4 | 20,315.28 | 2,400.00 | 1,547.11 | 24,262.39 |
| 5 | 24,262.39 | 2,400.00 | 1,832.45 | 28,494.83 |
| 6 | 28,494.83 | 2,400.00 | 2,138.41 | 33,033.24 |
| 7 | 33,033.24 | 2,400.00 | 2,466.49 | 37,899.74 |
| 8 | 37,899.74 | 2,400.00 | 2,818.29 | 43,118.03 |
| 9 | 43,118.03 | 2,400.00 | 3,195.52 | 48,713.55 |
| 10 | 48,713.55 | 2,400.00 | 3,600.02 | 54,713.58 |
| 11 | 54,713.58 | 2,400.00 | 4,033.77 | 61,147.34 |
| 12 | 61,147.34 | 2,400.00 | 4,498.86 | 68,046.20 |
| 13 | 68,046.20 | 2,400.00 | 4,997.58 | 75,443.79 |
| 14 | 75,443.79 | 2,400.00 | 5,532.35 | 83,376.14 |
| 15 | 83,376.14 | 2,400.00 | 6,105.79 | 91,881.93 |
| 16 | 91,881.93 | 2,400.00 | 6,720.67 | 101,002.60 |
| 17 | 101,002.60 | 2,400.00 | 7,380.00 | 110,782.60 |
| 18 | 110,782.60 | 2,400.00 | 8,087.00 | 121,269.60 |
| 19 | 121,269.60 | 2,400.00 | 8,845.11 | 132,514.70 |
| 20 | 132,514.70 | 2,400.00 | 9,658.02 | 144,572.72 |
The Compound Interest Calculator projects how a lump sum and a stream of regular contributions grow over time when the interest they earn is reinvested. You enter a starting amount, an annual interest rate, how long the money stays invested, and how often interest is compounded — annually, monthly, daily, or continuously — and the tool returns the final balance, the total interest earned, and a year-by-year schedule showing how the pot builds.
Compounding is the effect of earning interest on your interest. In the first period you earn interest only on the money you put in; in every period after that you earn interest on the original amount plus all the interest already credited. Over years and decades that feedback loop is what turns modest, steady saving into a meaningfully larger sum, and it is why the compounding frequency and the length of the term matter as much as the headline rate.
Every calculation runs in your browser in plain JavaScript. Nothing you type — the amounts, the rate, or your contribution plan — is uploaded, logged, or stored, and the calculator keeps working with no connection once the page has loaded. It is built for quickly comparing scenarios: nudge the rate, extend the term, or add a monthly deposit and watch the future value and interest update instantly.
Type your initial deposit and the annual interest rate as a percentage. Use the rate your account or investment actually quotes — a savings APY, a bond yield, or an assumed average return.
Choose how many years the money stays invested and how often interest is compounded: annually, semi-annually, quarterly, monthly, daily, or continuously. More frequent compounding raises the effective yield slightly.
Enter a contribution amount and pick monthly, quarterly, or yearly, plus whether deposits land at the start or end of each period. Leave it at zero to model a single lump sum.
See the future value, total deposited, total interest, and effective annual rate, along with a per-year schedule. Copy the one-line summary for a note, spreadsheet, or message.
Model annual, semi-annual, quarterly, monthly, daily, or continuous compounding and see how the effective annual yield shifts with each choice
Add monthly, quarterly, or yearly deposits and choose start-of-period or end-of-period timing to match how you actually save
A breakdown of each year shows the opening balance, contributions, interest credited, and closing balance so you can see compounding accelerate
The tool separates what you put in from what the interest earned, making the true impact of compounding easy to read at a glance
Calculate your monthly loan payment (EMI), total interest, and payoff date, with a full amortization schedule and extra-payment savings.
Calculate percentages three ways — what is X% of Y, X is what percent of Y, and percentage increase or decrease between two numbers.
Calculate the tip and split the bill between any number of people, with sales tax, tip-on-pre-tax, and round-up options.
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