Compound Interest Calculator
Compound interest with regular monthly or yearly contributions.
Project how savings grow with compound interest, including regular monthly, quarterly or yearly contributions. Choose your currency and see interest and capital side by side.
How to use it
- Enter the initial amount, the annual rate and the number of years.
- Add a regular contribution and say how often it is paid in.
- Read the final amount, what you put in, and the interest between them.
Frequently asked questions
What is the difference between simple and compound interest?
Simple interest is always calculated on the original amount. Compound interest is calculated on the amount plus the interest already earned, so growth accelerates.
How are regular contributions handled?
Each payment is added on its own schedule and then grows for the time it has left. Paying in at the start of each period rather than the end gives every payment one extra period of growth.
Does compounding frequency matter much?
Less than most people expect. Going from annual to monthly compounding at 5 percent adds roughly a tenth of a percent a year. The rate, the term and how much you pay in matter far more.