Calculators
Compound Interest
Future value with compounding
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Future value
Interest earned
Total contributed
Growth over time
Year 1
About this tool
See how a one-time deposit plus optional monthly contributions grow over time when interest compounds. Pick the compounding frequency (annual, monthly, daily) and the calculator returns the future value, the interest earned, and a year-by-year growth chart so you can visualise the curve.
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Formula
Compound principal: A = P × (1 + r/n)^(n × t)
Contributions (annuity): FV = C × ((1 + i)^m − 1) / i
where P = principal, r = annual rate, n = compoundings/yr, t = years, C = monthly contribution, i = effective monthly rate, m = months
How to use
- 1 Enter the starting principal.
- 2 Enter the annual interest rate as a percent.
- 3 Pick the number of years.
- 4 Choose the compounding frequency.
- 5 Optionally add a monthly contribution to model regular saving.
Examples
| $10,000 · 7% · 20y · monthly | ~$40,387 future value · ~$30,387 interest |
| $5,000 · 5% · 10y · annually | ~$8,144 future value · ~$3,144 interest |
| $1,000 · 8% · 30y · daily + $200/mo | ~$292,000 future value |
Frequently asked questions
Simple interest is calculated only on the original principal each period. Compound interest is calculated on the principal plus all previously accrued interest, which is why your money grows faster with compounding.
It matters at high rates and long horizons. The difference between annual and daily compounding at 7% over 30 years is only about 4–5%, but it grows with the rate.
A quick mental shortcut: divide 72 by the annual rate to estimate how many years it takes for an investment to double. At 8%, that is about 9 years.
No — the calculator returns the nominal future value before tax and inflation. To see real (inflation-adjusted) value, subtract an expected inflation rate from your nominal rate before entering.
If you plan to keep adding money on a regular schedule, include them. The calculator treats them as fixed monthly deposits that compound at the same rate.
Related tools
Educational projection, not financial advice. Shows nominal growth — real buying power is lower after inflation and tax. Real investment returns are volatile, not constant.
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Compound Interest
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