Compound interest calculator

Estimate how savings grow with a monthly contribution and compounding.

Calculated in this browser. Nothing is sent anywhere.

Monthly compounding with contributions added at month end. Taxes, fees, and inflation are not included — an estimate, not investment advice.

How to use

  1. Enter the starting amount, rate, years, and monthly contribution.
  2. Calculate.
  3. Read the final balance, total paid in, and interest earned.

What it supports

Monthly compounding with contributions added at month end. Taxes, fees, and inflation are not included — an estimate for planning, not investment advice.

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