Investment growth calculator

See how your money grows over time.

Simulate your investment with simple or compound interest and optional monthly contributions. See your final balance, how much you put in, and how much is pure interest.

Your investment

Adjust the numbers and the result updates instantly.
Compound interest grows on itself and supports monthly contributions.
$
$
%
mo
120 months = 10 years
Final amount
$0.00
after your investment period
Total invested
$0.00
Interest earned
$0.00
Final balance
$0.00
Enter your details and calculate.
Guide

How the investment simulator works

This tool shows how an investment grows over time, separating what you put in from what you earn in interest — so you can see the real power of compounding.

Simple vs. compound interest

Simple interest is earned only on your initial investment. The final value is your initial amount plus a fixed amount of interest for each year. Compound interest earns interest on your interest, so growth accelerates over time — and it lets you add a monthly contribution that keeps building your balance.

Monthly contributions

With compound interest, each monthly contribution is added to your balance and earns interest for the remaining months until the end of your investment period. Small, regular contributions can add up to a large difference over many years.

What the result shows

  • Total invested — your initial amount plus every contribution you made.
  • Interest earned — the growth on top of what you invested.
  • Final balance — the two combined: what your investment is worth at the end.

This tool provides estimates for planning and educational purposes only and is not financial advice. Real investment returns vary and are not guaranteed.