Compound Interest Calculator
FeaturedCalculate compound interest and future value for any principal, rate, time and compounding frequency.
About the Compound Interest Calculator
The Compound Interest Calculator projects the future value of an investment or savings account, factoring in an initial deposit, monthly contributions, an annual interest rate and a compounding frequency.
How to use the Compound Interest Calculator
- 1Enter the starting balance and any recurring monthly contribution.
- 2Enter the expected annual return and number of years.
- 3Pick the compounding frequency (monthly is a safe default).
- 4Read the projected balance and total interest earned.
Why people use it
- Model long-term retirement savings.
- Compare investing scenarios side-by-side.
- See the impact of starting five years earlier.
- Plan a savings goal with a target date.
Frequently asked questions
Which formula does it use?
The standard compound-interest formula A = P(1 + r/n)^(nt), extended with a PMT term for recurring contributions.
Does it account for inflation or tax?
No — outputs are nominal. Deduct your assumed inflation rate or applicable tax to get a real-terms figure.
How does compounding frequency affect my returns?
More frequent compounding (e.g., daily instead of annually) results in higher returns because interest is earned on the interest more often.
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