Results and growth
Compound Interest Calculator
Explore how repeated compounding and contributions affect a mathematical scenario, while keeping the assumed rate separate from real market returns.
The rate per period is non-negative; contributions are added at period end. A period can be a month, quarter or year. This is arithmetic, not a return forecast.
Contributions are added at the end of each period. This is arithmetic based on your input rate, not a return forecast.
How the calculator works
r = rate % / 100
r > 0: FV = principal × (1 + r)^n + contribution × ((1 + r)^n − 1) / r
r = 0: FV = principal + contribution × n
contributions at period end; doubling time excludes contributions
The rate per period is non-negative; contributions are added at period end. A period can be a month, quarter or year. This is arithmetic, not a return forecast.
Fees, funding, spread, slippage, contract specifications and venue rules can change the realised result. Recheck those details before placing an order.
Inputs to check before calculating
Inputs
- Starting capital, $
- Rate per period, %
- Number of periods
- Contribution per period, $ (optional)
- Enter values from the instrument and account you are evaluating.
- Run the calculation and check its units and assumptions.
- Compare the estimate with the venue contract, fees and risk rules.
Result: A planning estimate based only on the entered assumptions, not a trade recommendation.
Frequently asked questions
Does the projected ending value predict an investment result?
No. It is the mathematical result of the entered assumptions. Actual returns can vary and losses are possible.
Does the calculator place or recommend a trade?
No. It performs a planning calculation from the values you enter. It does not connect to an account, execute an order or provide personalised advice.
Calculator results are estimates for planning and education. Verify contract specifications, fees and rules with your broker or exchange.
Updated: · Midas Team
