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Investment tools / compound interest

Compound interest calculator

Build a simple growth scenario. Change one assumption at a time, then read the result with its units and limits.

Step 1

Set your assumptions

Ready

Use whole-dollar estimates. You can change these at any time; the result updates after you run the scenario.

Starting balance

Amount added each month

A scenario assumption, not a promise

%

How long money stays invested

years

Step 2 / projection

Estimated future value

$691,150

After 30 years · nominal dollars · rounded to nearest dollar

Total contributions$190,000
Interest earned$501,150

Growth over time

Contribution and estimated balance by year.

Read assumptions and disclaimer

Calculated with monthly compounding and contributions at the end of each month. The annual return is a scenario input; actual returns vary and may be negative.

This educational estimate is not financial advice. It excludes taxes, fees, inflation, and market volatility.