Calculators & Converters
Compound Interest Calculator
The Compound Interest Calculator projects how an initial deposit, plus optional regular contributions, can grow over time when interest is compounded at a chosen frequency such as annually, monthly or daily. It's aimed at anyone exploring long-term savings or investment scenarios, students learning how compounding works, or people comparing the impact of different rates and time horizons.
The projection is computed instantly in your browser the moment you change an input, with no server involved and nothing about your financial figures ever transmitted anywhere. That lets you freely experiment with different rates, timeframes and contribution amounts to see how the numbers shift.
How to Use the Compound Interest Calculator
- Open the Compound Interest Calculator tool.
- Enter your starting principal, annual interest rate and investment length.
- Select a compounding frequency, such as monthly or annually, and add any regular contribution amount.
- Review the projected balance and total interest earned, recalculated instantly as you adjust inputs.
Frequently Asked Questions
What formula is used for compounding?
The tool applies the standard compound interest formula, A = P(1 + r/n)^(nt), extended to include any regular contributions, where n is the number of compounding periods per year.
Does it account for regular deposits or withdrawals?
Yes, you can add a periodic contribution amount and the calculator will factor it into the growth projection alongside the compounding interest.
Are these projections guaranteed returns?
No, this is a mathematical projection based on the fixed rate you enter, not a prediction of actual investment performance, and it should not be treated as financial advice.