Compound Interest Calculator
Calculate compound interest: A = P(1+r/n)^(nt). Multiple compounding frequencies, regular contributions, inflation adjustment, and 10+ extras. 100% private.
About Compound Interest Calculator
Calculate compound interest: A = P(1+r/n)^(nt). Multiple compounding frequencies, regular contributions, inflation adjustment, and 10+ extras. 100% private. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
What's the compound interest formula?
A = P × (1 + r/n)^(nt), where P=principal, r=annual rate (decimal), n=compounding periods per year, t=years. With regular contributions, it gets more complex: A = P(1+r/n)^(nt) + PMT × [((1+r/n)^(nt) - 1) / (r/n)].
What extras does this tool have?
Extras: (1) 9 compounding frequencies (daily/weekly/monthly/quarterly/semi-annually/annually/continuously/custom), (2) Regular contributions (monthly/quarterly/annual), (3) Contribution at start vs end of period, (4) Inflation-adjusted real value, (5) Tax on interest, (6) Year-by-year breakdown, (7) Total contributions vs total interest split, (8) Multi-currency, (9) Copy individual results, (10) CSV export of breakdown, (11) Compare with simple interest, (12) Effective annual rate (APY), (13) Continuous compounding option, (14) Rule of 72 estimate.
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