How to Calculate Simple Interest
Calculate simple interest earned on principal over time.
The Formula
I = P × R × TThe simple interest formula uses the mathematical relationship: I = P × R × T. Each variable in the formula represents a measurable quantity that affects the final result.
Step-by-Step Method
- 1Identify all input values needed for the simple interest calculation.
- 2Substitute your known values into the formula: I = P × R × T.
- 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
- 4Check that your result has the correct units and is within a reasonable range.
- 5Verify using the interactive Simple Interest Calculator to confirm your answer.
Related Topics
simple interestloansavings
Use the Interactive Calculator
Skip the manual math — get instant results with our free Simple Interest calculator.