Compound Interest Calculator

Calculate compound interest, total growth, and convert your results between major currencies.

Calculate compound interest

Enter the principal amount, annual interest rate, time period, and compounding frequency. You can optionally convert the principal, interest, and total amount to another currency.

%
years
Optional currency conversion
The conversion uses the latest available exchange rate. The principal, interest, and total amount are all converted using the same rate.
Retrieving the latest available exchange rate…
Final amount
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Interest earned
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Converted amounts
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Interest earned
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Total amount
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Principal —
Annual interest rate —
Time —
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Final amount —
Step-by-step

How to calculate compound interest

Compound interest calculates interest on the original principal and on interest accumulated during previous compounding periods.

A = P(1 + r/n)nt
Compound Interest = A − P

A is the final amount, P is the principal, r is the annual interest rate expressed as a decimal, n is the number of compounding periods per year, and t is the time in years.

Step-by-step calculation

1
Enter the principal amount Enter the initial amount invested, deposited, or borrowed.
2
Enter the annual interest rate Enter the yearly interest rate as a percentage.
3
Enter the time period Enter the number of years. Decimal values are supported.
4
Choose the compounding frequency Select annually, semi-annually, quarterly, monthly, or daily.
5
Convert the result if needed The principal, interest, and final amount are converted using the same exchange rate.

Example

Suppose you invest $1,000 at 5% annual interest for 3 years, compounded monthly.

Principal $1,000.00
Annual interest rate 5%
Time 3 years
Compounding Monthly
Interest earned $161.47
Final amount $1,161.47

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Note: Compound interest calculations assume that the stated annual interest rate remains constant. Currency conversion uses the latest available exchange rate supplied by the exchange-rate provider. Exchange rates can differ from rates offered by banks, payment providers, or currency exchanges.