Investment

Simple Interest Calculator

Calculate interest earned when it accrues only on the original principal, not on previously earned interest.

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Adjust any field and recalculate — figures are pre-filled with a typical example.

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How it works

Formula & explanation

Simple Interest Calculator uses the following calculation:

Interest = P × r × t

This is a simplified model intended for planning and education. Real-world offers from lenders, institutions, or tax authorities may include additional fees, rules, or adjustments not reflected here.

FAQ

Frequently asked questions

Where is simple interest commonly used?

Some personal loans, certain bonds, and short-term notes use simple interest rather than compounding.

How is it different from compound interest?

Simple interest grows linearly, while compound interest grows exponentially because it's calculated on a growing balance.

Does simple interest favor borrowers or savers?

Borrowers generally benefit from simple interest since it accrues more slowly than compound interest on the same rate.

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