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Simple Interest Calculator

Calculate simple interest using the formula I = Prt. Free online Simple Interest Calculator for financial — instant, accurate results, no signup needed.

Interest (I = Prt)
$150.00
Total Amount
$1,150.00

Derivation

  1. ├── 01GivenP = $1000, r = 5%, t = 3 years
  2. ├── 02FormulaI = P × r × t
  3. ├── 03Substitute1000 × 0.05 × 3
  4. ├── 04Interest earned$150.00
  5. └── 05Total amount$1000 + $150.00 = $1,150.00
Did you know?

Simple interest is mentioned in the Code of Hammurabi (c. 1754 BCE) — with a cap of 33% per year on grain loans.

§01What is

Understanding the Simple Interest Calculator

The Simple Interest Calculator helps you compute calculate simple interest using the formula i = prt.. It runs entirely in your browser with no sign-up required.

Quick calculators for the math that shouldn’t need a notepad — instant, accurate, private to your browser. The Simple Interest Calculator sits in that toolkit — it calculate simple interest using the formula I = Prt. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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