Compound Interest Calculator

Estimate investment growth with compound interest. Enter a starting balance, contributions, interest rate, and time horizon to see the projected future value.

Why compound interest matters

Benefits

Understand how time and rate affect growth.
Compare scenarios with different contribution amounts.
Plan savings goals with simple projections.

Common use cases

Projecting retirement contributions.
Estimating growth of a long-term savings account.
Comparing compounding frequencies.

Field guide

Starting Amount: Initial principal.

Contribution: Regular amount added each period.

APR (%): Annual interest rate.

Years: Total time invested.

Compounds per year: How many times interest compounds annually (e.g. 12 monthly).