Triangle Calculator — Sides, Angles, Area & Perimeter

Free triangle calculator to find sides, angles, area, and perimeter using SSS and SAS. Classifies triangle type — 100% client-side. 100% serverless.

🔒 100% Private
⚡ Completely Free
🌐 Runs in Browser
📦 Export Ready
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Triangle Calculator — Sides, Angles, Area & Perimeter

Tool Workspace

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  1. Enter Values — At least 3 values (including 1 side).
  2. Calculate — Get all sides, angles, area, and perimeter.
  3. Copy — Copy results to clipboard.

Triangle Calculator

Enter sides and/or angles to calculate all properties of a triangle, including missing sides, angles, area, perimeter, and classification.

Features

  • SSS and SAS solving
  • Area by Heron's formula
  • Side and angle classification

Privacy

All calculations run in your browser.

Frequently Asked Questions

What inputs work?

SSS (3 sides) or SAS (2 sides + included angle). The calculator uses laws of cosines and sines.

What types does it classify?

By sides: equilateral, isosceles, scalene. By angles: right, acute, obtuse.

Is my data safe?

Yes. 100% in your browser.

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