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Percentage Calculator

Handle percent-of, percent-change, and difference formulas.

Runs locally in your browser.

Results are estimates for informational purposes and should not be treated as financial, tax, or investment advice.

Calculation mode

0% of 0 = 0.00

Use in code

Percentage operations are simple formulas that can be wrapped as reusable utility functions.

Calculate percentage increase

TypeScript

Primary API

((next - base) / base) * 100

Computes growth rate from base value to next value.

Built-in APILibrary: Arithmetic
function percentageIncrease(base: number, next: number) {
  return ((next - base) / base) * 100;
}

console.log(percentageIncrease(80, 100)); // 25

Reference: Arithmetic documentation

How this calculator works

  1. Select the percentage formula you need.
  2. Enter values for base and comparison numbers.
  3. Review the result and formula context.

Use cases

  • Calculate discounts and price increases.
  • Track month-over-month percentage changes.
  • Compare values using percentage difference.

Examples

  • What is 20% of 150? Result: 30.
  • Increase from 80 to 100 is 25%.
  • Decrease from 200 to 150 is 25%.

Limitations and assumptions

  • Results are calculations and should be reviewed before important decisions.
  • This tool does not provide financial, tax, or investment advice.

History

  • Percentage math has been used for centuries in trade, finance, and inventory calculations.
  • The percent concept became widely taught because it provides a simple way to compare values of different scales.
  • Digital calculators later brought percentage operations into everyday budgeting and business workflows.

Source: Percentage concept overview · Percentage increase and decrease

Evolution and improvements

  • Manual percentage tables and hand calculations transitioned to pocket calculators and spreadsheet formulas.
  • Web calculators made common scenarios like increase, decrease, and difference easier for non-specialists.
  • Modern tools present multiple formula modes so users can switch tasks without rebuilding equations manually.

Source: Percentage concept overview · Percentage increase and decrease

FAQ

What formulas are included?

Common formulas include percent-of, percentage increase, percentage decrease, and difference.

Can I use this for budgeting checks?

Yes. It helps with quick math, but verify final figures in your official workflow.