Simple Interest Calculator

Calculate simple interest without compounding using the standard I = P × r × t formula for bonds, loans, and short-term notes.

Calculator Inputs

$
Starting principal sum.
%
Annual interest percentage.
yrs
Time duration.

Calculated Results

Total Simple Interest Earned
$1,500.00
Total Future Value (Principal + Interest) $11,500.00
Annual Interest Generated $500.00 / year
Monthly Interest Accrual $41.67 / month
Values calculate live as you adjust inputs.

About Simple Interest Calculator

Calculates non-compounding linear interest accrued exclusively on original starting principal.

What is Simple Interest Calculator?

Calculates non-compounding linear interest accrued exclusively on original starting principal.

How to Use This Calculator

  1. Enter principal amount P.
  2. Enter annual interest rate r.
  3. Enter duration in years t.
  4. View accumulated simple interest.

The Mathematical Formula & Variables

Interest = Principal * (Rate / 100) * Time

Step-by-Step Worked Example

Scenario: $10,000 principal at 5.0% for 3 years.

  1. I = 10,000 * 0.05 * 3 = $1,500.
  2. Total Amount = $10,000 + $1,500 = $11,500.

Result: $1,500.00 Interest

Frequently Asked Questions

Where is simple interest still used?

Simple interest is standard on auto loans, short-term promissory notes, treasury bills, and consumer installment loans.