📐Triangle Calculator
Calculate triangle area, perimeter, and angles from three sides.
🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup
Calculate triangle area, perimeter, and angles online for free. Law of cosines applied.
Area6.0000
Perimeter12.0000
Angle A36.87°
Angle B53.13°
Angle C90.00°
TypeScalene (Right)
How to Use Triangle Calculator — Step by Step
- 1Choose what you know — sides (SSS, SAS), angles (ASA, AAS), or hypotenuse (right triangle)
- 2Enter the known values
- 3Click 'Calculate' — all missing sides, angles, area, and perimeter are computed
- 4The triangle type (scalene, isosceles, equilateral) is identified
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Frequently Asked Questions
Is this tool completely free?
Yes. All ToolNest tools are 100% free with no signup required, no account, and no watermarks added to output files.
Are my uploaded files secure and private?
All uploads use HTTPS encryption during transfer. Files are processed on secure isolated servers and automatically deleted within 2 hours of upload.
Does this tool work on mobile phones?
Yes. ToolNest works on any modern browser on iPhone, Android, tablet, or desktop — no app download or plugin needed.
Do I need to create an account?
No. Just open the tool, upload your file, and download the result. No email, no signup, no password.