Calculator

Simple Interest Calculator

Multiply principal by a yearly rate and the number of years.

Your inputs

USD
%
YR

Changes formatting only, not the value.

Simple interest

$1,500.00

Interest is not added back to the principal.

Principal
$10,000.00
Principal plus interest
$11,500.00

Formula

Simple interest does not compound:

Interest = principal × rate × years

A compound-interest page is separate because that balance earns interest on earlier interest.

Assumptions

  • The rate stays flat.
  • No interest is reinvested.

Worked example

$10,000 at 5% simple interest for 3 years earns $1,500.00.

Input definitions

Principal
The starting amount that does not change.

Limitations

This is an estimate, not a loan offer, tax filing, or investment advice. The currency control changes the symbol only.

Questions

When is simple interest used?

Some short loans and notes charge interest only on the original principal.

What is 5% of $10,000 for one year?

It is $500. This page multiplies that by the number of years.

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