Privacy controls
FinanceFormula-based · Runs in your browser

Simple Interest Calculator

Calculate non-compounding interest, total value, and annual interest.

Scan this calculator
Preparing saved example…

Inputs

Enter the values you know. Optional fields may be left empty.

Local save controls below
Required
$
Required
%
Required
years

Result

Updates as valid inputs change.

Calculated locally
Total amount
—
Total interest
—
Interest per year
—

Saved locally, explained clearly

Drafts, calculations, scenarios, and workflow progress stay in this browser unless you export them.

Opening local database…

Calculation steps

Follow what happened from the selected formula to the displayed answer.

Show substituted values and intermediate working
Calculate current inputs to see the working.
  1. 1

    Formula selected

    The calculator uses the following formula or method.

    Interest = principal × annual rate × years

    The rate is divided by 100. Interest is not added back to the principal.

  2. 2

    Values entered

    Your values are placed into the calculation.

    Enter values to see what is used in this step.

  3. 3

    Result calculated

    The formula or method produces the following result values.

    Results will appear after a successful calculation.

  4. 4

    Answer formatted

    Displayed values are rounded and formatted using each output’s configured precision.

Scenario comparison

Save working scenarios, then select two or three to compare. Formula versions and inputs remain visible.

No scenarios saved for this calculator yet.

Recent calculations

Successful calculations are retained locally according to your privacy settings.

No local history for this calculator yet.

Data and privacy

How it works

Simple interest uses the starting principal for every year. Earned interest does not compound.

Input query strings and outputs

Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.

Input query strings

3
  • ?principal= Principal

    Money · Required · Default: 10,000

  • ?annualRate= Annual interest rate

    Percentage · Required · Default: 5

  • ?years= Time

    Number · Required · Default: 5

Outputs

3
  • totalAmount Total amount

    Currency · Primary output

  • interest Total interest

    Currency

  • annualInterest Interest per year

    Currency

Use it for

Short loans, basic notes, and simple growth estimates where the principal stays unchanged.

Limits

Fees, changing rates, and compounding are not included.

Sources
  • No external reference is listed for this calculator. Its formula and variable definitions are shown above.
Limitations
  • The rate is divided by 100. Interest is not added back to the principal.
  • Estimates use the rates, timing, and assumptions entered. Fees, taxes, lender rules, and future changes are included only where explicitly shown.

Related calculators

Finance

Compound Interest Calculator

Project investment growth with regular monthly contributions and selectable compounding.

Open calculator
Finance

Savings Calculator

Estimate savings growth and check an optional savings goal.

Open calculator
Finance

Future Value Calculator

Grow a present amount at a fixed rate with selectable compounding.

Open calculator