Compound Interest Calculator

Project how a balance grows with compounding and regular contributions.

How this calculator works

Enter the values for principal, annual rate (%), years, compounds/year, periodic contribution. The result applies the displayed method and rounds only for presentation.

Formula / method

A = P(1 + r/n)^(nt) + PMT × (((1 + r/n)^(nt) − 1) ÷ (r/n))

Worked example

Worked example: Principal = 10000; Annual rate (%) = 8; Years = 10; Compounds/year = 12; Periodic contribution = 0.

Assumptions and limitations

The inputs use the units shown and the displayed compound interest calculator method applies to the situation being estimated.

This compound interest calculator uses the stated formula and supplied units; unusual inputs, local rules or professional context can change the interpretation.

Informational only: this estimate is not financial advice. Actual rates, fees, taxes and lender or market terms may differ.