Free online finance tool
Quick simple interest calculator for loans and investments. Specify tenure in years, months, or days with full mathematical formula steps.
Enter your principal, interest rate, and time period. The calculator computes interest using I = P × R × T, along with the total amount (principal + interest).
Simple Interest Earned: $6,500
Calculate simple interest (I = P*R*T/100) with tenure in years, months, or days. Yuitility keeps the workflow fast and focused, so you can complete the job without creating an account.
Frequently asked questions about calculation formulas, privacy, and usage.
Less common in everyday lending than people assume — most consumer loans and deposits use compound interest. Simple interest typically appears in certain short-term loans, bonds, or as a simplified teaching example.
Simple interest is calculated only on the original principal for the entire period, while compound interest also earns returns on previously accumulated interest.
The formula works with any consistent time unit as long as the interest rate matches that unit — most commonly expressed as an annual rate with time in years.
No. All simple interest calculations run 100% locally in browser memory.
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