Simple Interest Calculator
Calculate simple interest and total amount for loans and savings.
Simple Interest
Total Amount
About Simple Interest Calculator
Calculate simple interest on any principal amount at a given rate for a specified time period. Shows total interest earned/paid and the final amount. Also works in reverse — find principal, rate, or time from other values.
Use Cases
Calculating interest on short-term loans, understanding bank savings account interest, exam preparation for financial maths, comparing SI vs CI.
How It Works
Uses the formula SI = P × R × T / 100, where P is principal, R is annual interest rate (%), and T is time in years. Amount = P + SI.
Frequently Asked Questions
Can I enter time in months?
Yes. Select "months" and the calculator converts it to years automatically.
What is the formula for simple interest?
SI = (Principal × Rate × Time) / 100. Amount = Principal + SI.