Free Simple Interest Calculator — Calculate SI, Total & Maturity
Free Simple Interest Calculator
Enter principal, rate, and time to see the interest earned or paid, and the total maturity value.
What is Simple Interest?
Simple interest is interest calculated only on the original principal amount. It does not earn interest on interest, so it grows linearly over time.
Formula: SI = P x R x T / 100
- P = Principal (original amount)
- R = Annual interest rate (percent)
- T = Time period in years
The total maturity value is: Total = Principal + Simple Interest
Frequently Asked Questions
What is simple interest?
Simple interest is interest calculated only on the principal amount. It does not compound.
How is simple interest different from compound interest?
Simple interest is calculated only on the principal. Compound interest is calculated on the principal plus accumulated interest, so it grows faster over time.
Can I calculate simple interest for months or days?
Yes. This calculator supports time in years, months, or days, and converts automatically.
Where is simple interest used?
Simple interest is commonly used for short-term loans, personal loans, car loans in some countries, and simple savings accounts.
Is this simple interest calculator free?
Yes, completely free with no signup required.