Compound Interest Calculator
Compounding is interest earning interest. Set a starting balance, a monthly contribution and a rate to watch your money grow — and see how much of the result is pure growth.
- Total contributions
- $95,000
- Interest / growth
- $176,649
- Final balance
- $271,649
You contribute $95,000, and compounding adds another $176,649 on top.
Use Left and Right Arrow, Home, or End to inspect data points.
Estimates only — not financial advice. They produce estimates based on the figures you enter and do not account for every fee, tax or change in rate.
- The result is a deterministic estimate from the inputs shown on this page.
- Fees, taxes and real-world terms not represented by an input are excluded.
- Confirm material decisions against original documents or a qualified professional.
The email includes this route only; calculator inputs are not attached.
Why time matters more than amount
Because growth compounds, money invested early has decades to multiply. Starting ten years sooner often beats contributing much more later. The shaded gap between contributions and balance above is compounding at work — and it widens fastest in the final years.