Compound Interest Calculator
See how savings grow with compound interest and monthly contributions, with a year-by-year table.
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Compound Interest Calculator shows how an amount grows when the interest you earn also starts earning interest. Enter a starting amount, an optional monthly contribution, the annual interest rate, the number of years and how often interest is compounded, and you instantly see the final balance, how much you put in and how much came from interest.
Planning a home purchase? Estimate the monthly payment with the Mortgage Calculator.
More about Compound Interest CalculatorHow to use, good to know & FAQ
A year-by-year table shows the balance at the end of every year, so you can compare plans side by side. It works in any currency — just type the numbers. For borrowing rather than saving, use the Loan Calculator; for quick percentage changes, try the Percentage Calculator.
How to use Compound Interest Calculator
- Enter your initial amount and how much you will add each month.
- Enter the annual interest rate, the number of years and the compounding frequency.
- Read the final balance, total contributions and interest, and check the yearly table.
Good to know
- The formula for a single amount is A = P × (1 + r/n)^(n×t), where r is the yearly rate and n the number of compounding periods per year.
- Monthly contributions are added each month; choose whether they are paid at the start or end of the month.
- More frequent compounding (monthly or daily) gives a slightly higher result than yearly compounding at the same rate.
- Results are estimates: real investments can change in value, and taxes, fees and inflation are not included.
Frequently asked questions
What is compound interest?
It is interest calculated on both your original amount and the interest already added. Over long periods it makes savings grow much faster than simple interest.
What does compounding frequency mean?
It is how often interest is added to the balance — yearly, half-yearly, quarterly, monthly or daily. The more often it is added, the sooner it starts earning interest of its own.
Can I use this for any currency?
Yes. The calculator works with plain numbers, so it suits rupees, dollars, pounds, euros or any other currency.
Is this financial advice?
No. It is a maths tool for estimates. For decisions about investments or savings products, check the provider’s terms or speak to a qualified adviser.
When to use Compound Interest Calculator
- Comparing savings accounts or fixed deposits with different rates
- Planning how much to save each month for a goal
- Showing students how compound growth works over time
- Checking how much difference starting earlier makes