Compound Interest Calculator — Free Online Tool
Calculate how a lump sum grows with compound interest over time. Set annual interest rate, compounding frequency (annually to daily), and optional periodic contributions. Results include the final balance, total interest earned, and a year-by-year breakdown table.
100% client-side. No uploads. Your data never leaves your browser.
How to use Compound Interest Calculator
- Enter principal amount, annual rate %, and years.
- Select compounding frequency.
- Optionally add a periodic contribution amount.
- See final amount, total interest, and the year-by-year breakdown.
Frequently Asked Questions
What is compound interest?
Compound interest means interest is calculated on both the principal and accumulated interest. This causes exponential growth — you earn interest on your interest.
What does compounding frequency mean?
How often interest is calculated and added. Monthly compounding typically grows faster than annual at the same rate, because interest accrues more frequently.
What is the additional contribution field?
An optional regular contribution added each compounding period. Simulates monthly deposits into a savings or investment account.
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