Simple Interest Calculator

Solve any variable in the fundamental interest equation.

Principal Amount

$

Interest Rate

Investment Term

Interest Logic

Solve for any missing variable in the simple interest formula. Choose your goal from the tabs above and we'll handle the algebraic conversion for you.

Principal (P): The original amount.
Rate (r): Annual percentage.
Time (t): Duration in years.

Interest = P × r × t

Simple interest is standard for short-term personal loans. If you're building long-term wealth, look for compound interest accounts to leverage the power of reinvestment.

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Simple Interest Calculator

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