Calculation method
The nominal annual rate is converted to an equivalent monthly rate using the selected compounding frequency. Contributions are added at month-end.
Saving & investing · General formulas
Compound Interest Calculator
Project how an initial balance and monthly contributions may grow. Use the example values or enter your own numbers to explore an estimate.
Currency formatting only—not an exchange-rate conversion. No country-specific tax or government rules are applied.
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Assumptions & limits
- Interest rate remains constant.
- No taxes, fees, or inflation adjustments.
- Basis: user-entered values.
- Basis: standard fixed-payment and time-value-of-money formulas.
Tax or legal rule year: Not applicable — no country-specific rules are used.