How will compound interest grow my money?

Compounding is interest earning interest. Enter what you start with and what you add each month — we'll show what it grows into, how much of that is your own money, and how much the market did for you.

Your plan

INPUTS

Starting amount

Monthly contribution

Annual return

Years

yrs

Compounding frequency

Increase contribution each year

Optional — most people can raise contributions as income grows.

Inflation

Used only to show what the balance buys in today's money. Set it to 0 to see the nominal figure alone.

What it becomes

PROJECTION

🧮

Enter a starting amount or monthly contribution, a return, and how many years you'll stay invested.

Save or send these numbersEmail

All four happen in your browser. Your figures are not sent anywhere — the email opens in your own mail app, already filled in.

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Why the curve bends late, and the rule of 72A written guide to the rules behind this calculator →

For educational purposes only. Projections assume a constant rate of return, which no real investment delivers. Actual results vary with markets, fees, and taxes. Not investment advice.