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Interest Calculator

Simple interest: principal × annual rate × time. For compounding or recurring deposits, use the dedicated calculators.

Your numbers

Simple interest

Interest = principal × annual rate × time. No compounding.
$
%
years

Interest

$1,500.00Ending $11,500.00
How we got this
  1. Principal$10,000.00
  2. Interest$10,000.00 × 5% × 3 years$1,500.00
  3. Ending amount$11,500.00
What we assumed
  • This calculator uses simple interest: principal × annual rate × time.
  • It does not compound. For compounding, use the Compound Interest Calculator.
  • For recurring contributions, use the Investment Calculator.
  • Taxes and fees are not included.
Technical details

Method interest-v1.0.0Data Manual inputs / fixed rules

Guide

Simple interest, with no compounding

CostAnswer editorialIndependent calculator publisher

Interest = principal × annual rate × time in years. There is no compounding and no recurring deposit. For those, use compound interest or the CD calculator.

When simple interest is the right tool

Some short-term notes and classroom problems are defined as simple interest. A savings account that advertises APY is not simple interest. If you are not sure, the product’s disclosure is the authority, not this page.

Questions about this calculator

Why is this lower than compound interest?

Simple interest never earns interest on interest. Over several years that gap grows.

Terms used here

Simple interest
Principal × rate × time. The principal never changes in the formula.

Practical tips

  • Keep time in years (18 months is 1.5, not 18).

Limits and caveats

  • Exact for the formula. Not a loan amortization and not a savings APY.

Results are for information. They are not legal, tax, medical, or financial advice. How the math is maintained · Report a wrong figure.

Engine notes

Rounding, versioning, and omissions that sit beside the guide rather than repeating it.

  • Simple interest. Interest = principal × annual rate × time. $10,000 × 5% × 3 years = $1,500 interest and $11,500 total.
  • No compounding. The balance does not earn interest on interest here. Recurring deposits belong on the Investment Calculator.
  • Rate meaning. The rate is a nominal annual simple-interest rate, not APY and not a loan APR with fees.

Calculation receipt

What each number here is

This answer is arithmetic on what you enter. No outside dataset is involved, so nothing here can go out of date.

Simple interest is principal × rate × time.

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