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Compound Interest Calculator

What a sum grows to over time, with or without regular contributions — plus a year-by-year table showing how much of the total is your money and how much the interest earned.

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This shows the mathematics of compounding. It takes no account of tax, fees, inflation or a rate that changes, and it is not investment advice.

How to Use the Compound Interest Calculator

  1. Enter the amount you are starting with.
  2. Enter the interest rate, how often it compounds, and the number of years.
  3. Add a regular contribution if you plan to keep paying in.
  4. Read the future value and how much of it is interest.

What You Can Do

Frequently Asked Questions

What is compound interest?

Interest that is added to your balance and then earns interest itself, so growth accelerates the longer the money is left alone.

How is it different from simple interest?

Simple interest is always calculated on the original amount. Compound interest is calculated on the balance, including interest already earned.

Does compounding frequency matter?

Yes, though less than people expect. Monthly compounding beats yearly at the same nominal rate, but the gap is small next to the effect of time.

Does this account for inflation, tax or fees?

No. It shows nominal growth. Real spending power will be lower once inflation, tax and charges are taken into account.