Triangle Area Calculator
Give three sides to get the area by Heron's formula plus the perimeter and all angles.
🔺Triangle Area Calculator
All processing happens locallyWhat this tool does
Triangle Area Calculator is a geometry calculator that returns area, perimeter, volume or surface area with the formula used., formulas follow textbook and engineering-handbook forms; every related quantity is derived from your length input.
keep a single length unit per field, angles are in degrees, and degenerate shapes report an invalid result.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
Only the display is rounded; the computation keeps full double precision.
Yes. Geometric quantities scale linearly, so convert the result by the same factor.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.