Compound Interest Calculator

Project investment growth with compound interest and monthly contributions.

How to Use

  1. Enter principal, monthly contribution, rate, and years.
  2. Choose compounding frequency.
  3. View final amount and growth chart.

Compound growth formula

A = P(1+r/n)^(nt) + PMT × [((1+r/n)^(nt)−1)/(r/n)]. Contributions assumed at period end.

Frequently Asked Questions

What is compound interest?
Interest earned on both principal and previously accumulated interest.
What does the millionaire mode do?
It estimates how long to reach $1,000,000 with your contribution rate.

Related Tools