Work out how much interest your money earns over time with a simple flat rate. Enter the principal, annual interest rate and time period to get the interest and total amount – free, instant and private, with no sign-up needed.
How to Use
- Enter the principal – the amount of money you are saving or borrowing.
- Enter the annual interest rate as a percentage.
- Enter the time period in years, then click Calculate Interest to see the interest earned and the total amount.
Key Features
- Classic formula – interest = principal × rate × time ÷ 100.
- Flexible periods – whole or fractional years are supported.
- Clear breakdown – see the interest and the total amount side by side.
- 100% private – everything runs in your browser; nothing is sent anywhere.
FAQs
Is this simple interest calculator free?
Yes. It is completely free with no sign-up and no limits.
What is simple interest?
Simple interest is calculated only on the original principal, so it grows by the same amount each year. It is commonly used for short-term loans and basic savings estimates.
How does this differ from compound interest?
Compound interest is calculated on the principal plus any interest already earned, so it grows faster. Try our Compound Interest Calculator to compare the two.
Is my data stored anywhere?
No. The calculation runs entirely in your browser and nothing is transmitted or saved.
Related Tools
Compound Interest Calculator · EMI Calculator · Percentage Calculator