Simple Interest Calculator
Flat-rate interest on principal — quick and transparent. Calculate simple interest instantly. Enter principal, rate and time to get interest earned and total amount. Free simple interest calculator with formulas.
À propos de Simple Interest Calculator
Simple interest is the honest elder sibling of compound interest: interest is charged only on the original principal, never on accumulated interest. This calculator applies the classic formula SI = P × R × T ÷ 100, showing the interest earned and the final amount for any principal, annual rate and period in years, months or days. It also displays the working, making it a favourite for school problems, informal loans between friends and flat-rate product comparisons.
Comment utiliser Simple Interest Calculator
- Enter the principal amount.
- Enter the annual interest rate.
- Set the period — years, months or days.
- Read the interest and total amount.
Fonctionnalités clés
- Classic SI = PRT formula
- Periods in years, months or days
- Shows the calculation working
- Interest and final amount together
When is simple interest used in real life?
How is simple interest different from compound?
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