Compound Interest Calculator

Project how savings or investments could grow over time with contributions and compounding returns.

Free online calculatorInstant estimateNo account required

Savings Details

Results

Future Value$0
Total Contributed$0
Investment Growth$0
Ending Balance$0
Monthly Contribution$0
Effective Monthly Rate0%
Contributions
Growth

Enter your savings details and click calculate.

Yearly Projection

Year Total Contributions Estimated Growth Ending Balance
compound interest calculator monthly contributions guide

How to use this compound interest calculator

Compound interest means growth can build on previous growth. This calculator helps show why time, contributions, and estimated return matter so much for long-term saving.

Steps

  1. Enter starting balance and monthly contribution.
  2. Add an estimated annual return and number of years.
  3. Choose a compounding frequency.
  4. Review future value, contributions, and estimated growth.

Calculation method

The calculator applies an estimated periodic return and adds monthly contributions through the selected time period.

Example scenario

A smaller monthly contribution started earlier can sometimes beat a larger contribution started later because the money has more time to compound.

Tips for a better estimate

  • Use conservative return assumptions.
  • Remember that investment returns are not guaranteed.
  • Try several time horizons to see the value of starting earlier.

Compound Interest Calculator FAQ

Is the annual return guaranteed?

No. It is only an assumption for educational estimates. Real investment returns can be higher or lower.

Does this work for savings accounts?

Yes, but use a savings account rate instead of an investment return assumption.

Why do contributions matter so much?

Regular contributions increase the amount that can earn future returns, especially over long periods.