plugmyagent

mathjs API

Utilities No key

AuthenticationNo key
Rate limit10,000 requests per day free; each calculation may run up to 10 seconds

Documentation: api.mathjs.org ยท Checked Sep 13, 2026

About

The mathjs API evaluates any math expression you send it: arithmetic, percentages, unit conversions ("12.7 cm to inch"), square roots, trigonometry, and more. You just put the expression in the URL and get the answer back as text. It's free with a generous daily allowance and needs no key or account.

Details

No key needed. You can call it right away.

Auth: No key

Rate limit: 10,000 requests per day free; each calculation may run up to 10 seconds

Verified: 2026-09-13

Best for: personal business developer

Read the docs Back to catalog

Setup

  1. Read the docs page to see what's possible
  2. Paste the example URL in a browser. It returns 8
  3. Try your own: replace the expr with a URL-encoded expression like 15%2B27
  4. Connect the URL to your app or spreadsheet to calculate automatically
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