Simple Interest Calculator

Calculate SI, find the rate, principal, or time — 4 modes

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Simple Interest
Principal
Total amount
Rate
Time
SI = P × R × T / 100

Simple Interest vs Compound Interest

What is simple interest?

Simple Interest (SI) = Principal × Rate × Time / 100. Interest is calculated only on the original principal, not on accumulated interest. It is used in short-term loans, some fixed deposits, and government schemes.

When is simple interest used?

Simple interest is used for short-term personal loans, car loans (sometimes), some RD accounts, and treasury bills. Most bank FDs and investments use compound interest, which gives higher returns.

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