Compound Interest Calculator
See how compounding turns a rate into a future value.
About this calculator
Compounding means earning a return on your returns. This calculator shows the future value of an amount left to compound at a fixed annual rate over a set term, and how much of that is interest. Useful for comparing savings accounts, bonds, or any instrument quoted as an annual rate.
The compounding frequency matters: the same annual rate compounded monthly yields a little more than compounded annually. Switch the frequency to see the effect.
Frequently asked questions
What's the difference between simple and compound interest?
Simple interest is calculated only on the original amount. Compound interest is calculated on the amount plus previously-earned interest, so it grows faster over time. This tool computes compound interest.
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These calculators are for general information and planning only. They use the assumptions you enter and do not constitute financial, tax, or investment advice. Tax figures are simplified estimates for the stated tax year. Returns are not guaranteed; verify figures independently before making decisions.