Compound Interest Calculator
Calculate compound interest with any compounding frequency — yearly, half-yearly, quarterly, monthly.
About the Compound Interest Calculator
Compound interest is interest earned on both your principal and the interest already accumulated — the engine behind every long-term investment. The AlarmDaddy Compound Interest Calculator computes the maturity value and total interest for any principal, rate, tenure, and compounding frequency.
Enter the principal, the annual rate, the tenure, and choose how often interest compounds (annually, half-yearly, quarterly, monthly, or daily). The calculator shows the final amount and the interest component. Compare it side by side with simple interest to see exactly how much extra compounding earns over time — the gap widens dramatically as the tenure grows.
How to use this calculator
- 1Enter the principal amount.
- 2Enter the annual interest rate.
- 3Enter the time period in years.
- 4Choose the compounding frequency.
- 5Read the maturity amount and total compound interest.
The formula
Where P is the principal, r is the annual rate (decimal), m is the number of compounding periods per year, and t is the time in years. Higher m (more frequent compounding) produces a slightly larger maturity value.