Compound Interest Calculator

Watch how a little savings can grow into a lot over time.

Starting amount

Add per month

Annual interest rate

Number of years

yrs

Advanced settings

Increase my monthly amount by each year

1%–2% a year is normal — think of it like a raise keeping pace with your contributions.

Adjust for inflation

Monte Carlo scenariosRuns 300 randomized market simulations (assuming 15% annual volatility) and shows the 10th, 50th, and 90th percentile outcomes. It's built for investments that go up and down, so it's most useful with a stock-market-style rate rather than a fixed savings rate.

One-time lump sums

A bonus, gift, or inheritance you plan to invest all at once — pick when you'll add it.

Customize by year

After 5 years, you'd have

$1,488.46

You put in

$1,300.00

Interest earned

$188.46