Compound Interest Calculator
Final balance
| Total deposits | |
|---|---|
| Total interest earned |
Yearly breakdown
| Year | Cumulative deposits | Cumulative interest | Balance |
|---|
Compound interest means your earnings start earning too, so money grows faster over time. Enter a starting amount, an annual return rate and a duration — plus an optional monthly deposit — and watch your balance build year after year.
How to use
- Enter the initial amount you start with.
- Enter the expected annual return rate and the number of years.
- Choose the compounding frequency (yearly, semi-annual, quarterly, monthly).
- Add an optional monthly deposit, then press Calculate for the yearly breakdown.
Frequently asked questions
What is the difference between simple and compound interest?
Simple interest is computed on the original principal only, while compound interest is computed on the principal plus accumulated earnings — so growth accelerates over the years.
What does compounding frequency mean?
It is how many times per year earnings are added to the balance. More frequent compounding (e.g. monthly vs yearly) slightly increases growth at the same nominal rate.
How much does a regular monthly deposit matter?
Regular deposits add new money that starts compounding itself — the strongest factor in long-term saving. Try comparing results with and without it.
Are the results guaranteed?
The calculator shows mathematical growth at a fixed rate for planning purposes only; it is not a prediction or promise of actual investment returns.