Math

Percentage Calculator

Calculate percent of a number, percent change, and share of total.

NewAPI Ready

Focused calculator

Calculate Percentage Calculator

Result 30 20% of 150

Formula

Formula: percent-of = x * y / 100; percent change = (new - original) / original * 100; share = part / total * 100.

Common examples

InputResult
20% of 15030
100 to 12525% increase
45 of 6075%

JSON API example

Use the public JSON endpoint with these query parameters.

  • modepercent-of
  • x20
  • y150
GET https://api.convematik.com/percentage?mode=percent-of&x=20&y=150

{
  "mode": "percent-of",
  "result": 30.0,
  "formula": "x percent of y = x * y / 100"
}

Common questions

What does the Percentage Calculator do?

Calculate percent of a number, percent change, and share of total.

Is the calculation available through the API?

Yes. The same calculation is exposed by the Convematik API for programmatic use.

Can I use it without signing in?

Yes. The public calculator is free and does not require an account.