Compound Interest Calculator

See how compounding grows your savings, with a year-by-year balance table.

How this calculator works

Interest is added to the balance at your chosen compounding frequency, then earns interest itself. Optional deposits are added at the end of each month.

Frequently asked questions

How often should interest compound?

More frequent compounding earns slightly more, but the rate matters far more than the frequency.

Figures use 2026 US federal tax parameters. Results are estimates only.