Savings calculator
Compound Interest Calculator
Enter a principal, rate and tenure to see the maturity amount and interest earned at a chosen compounding frequency. Your entered values stay out of analytics.
Formula and assumptions
Maturity amount = principal × (1 + annual rate ÷ compoundings per year) raised to the power of (compoundings per year × years).
- Maturity amount = principal x (1 + annual rate / compoundings per year) to the power of (compoundings per year x years).
- The rate you enter is used exactly as entered — it is not checked against any bank's actual rate.
- Money is rounded to 2 decimal places (half up), from the exact figure.
Formula version 1.0, last reviewed Reviewed and released by the owner, 8 October 2026.
Frequently asked questions
What compounding frequency should I use?
Match whatever your bank or investment actually compounds at — for example annually for many savings accounts, quarterly for most fixed deposits. The FD Calculator fixes this at quarterly for you.
Does this work for a fractional number of years?
Yes — 2.5 years is accepted.