Calculate interest earned or payable using the simple interest formula.
Simple interest is calculated only on the original principal amount for the entire duration, using the formula: Interest = (Principal × Rate × Time) / 100, where Time is in years. Unlike compound interest, previously earned interest doesn't itself earn further interest — the growth is linear rather than accelerating.
Simple interest is commonly used for shorter-term loans, certain fixed-term instruments, and some legal/contractual interest calculations, while most savings and investment products (FDs, RDs, mutual funds) use compound interest instead.
Simple interest is more common in short-term lending, certain government schemes, and some legal contexts (like interest on delayed payments), while savings and investment products almost always use compound interest, which grows faster over time.
Yes — for the first compounding period, simple and compound interest give the same result, since there's no prior interest yet to compound. They only diverge from the second period onward.
The gap grows with both the rate and the time period — over a few years the difference may be small, but over decades, compound interest can result in a significantly larger final amount for the same principal and rate.