Simple Interest Calculator

I = P·r·t — solve for interest, total amount, principal, rate, or time.

Calculator Finance Updated Apr 20, 2026
X Facebook LinkedIn Reddit Email
How to Use
  1. Pick what to solve for.
  2. Enter the other three variables — result updates live.
Input
Result

Formula

Simple interest
I = P · r · t
Total amount
A = P + I = P(1 + rt)

Last updated: