CalculatorsInstant
Compound Interest Calculator
Calculate compound interest with monthly contributions and adjustable annual rate.
Examples
See what this tool can do.
Project a savings goal
See what regular monthly deposits become over ten years.
Compare rates
Check how a higher rate changes the final balance.
Tips & tricks
Get the most out of it.
- 1Regular contributions often matter more than the starting amount.
- 2Time is powerful — small differences compound over many years.
- 3Remember returns aren't guaranteed; treat this as a projection.
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About Compound Interest Calculator
What this tool does
Compound Interest Calculator projects how savings grow over time with an annual rate and optional monthly contributions.
How to use it
- Enter your starting amount, rate, years and monthly contribution.
- See the future value and interest earned.
- Read the year-by-year growth table.
How it works
It compounds your balance monthly, adding contributions and applying the periodic rate, then totals the interest earned versus what you put in.
Important considerations
- Projections assume a constant rate; real returns and inflation vary.
Privacy
This tool runs entirely in your browser. Nothing you enter is uploaded to a server.
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Frequently asked questions
Compound interest earns interest on your interest, so the balance grows faster over time than simple interest on the principal alone.