About the Investment Calculator
Project how an investment grows with a starting amount, monthly contributions and an expected return — with a yearly table.
Also known as: investment growth, investment return calculator, stock market calculator, how much will my investment grow.
How to use this calculator
- Enter initial investment, monthly contribution, expected annual return, years.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
FV = P(1 + r)ⁿ + PMT·((1 + r)ⁿ − 1)/r (monthly periods)
- P
- = initial amount
- PMT
- = monthly contribution
- r
- = monthly rate
- n
- = months
Worked example
Using the values pre-filled in the calculator above:
- Initial investment = 10,000
- Monthly contribution = 500
- Expected annual return = 8 %
- Years = 20
the calculator returns:
- Future value: 343,778.24
- Total contributed: 130,000
- Total growth / interest: 213,778.24
- Growth as % of contributions: 164.44%