321Kit Tools ready in 3, 2, 1.

Developer / Quick tool

Triangle Calculator

Calculate perimeter, Heron area and three angles from valid side lengths.

● Processed locally in your browser
Processed locally in your browser
Triangle measurements Choose an action to process the input.

Processed locally in your browser

How to useHow to use Triangle Calculator

Calculate perimeter, Heron area and three angles from valid side lengths.

  1. 1

    Paste content, enter parameters or choose the files you need in “Three side lengths”.

  2. 2

    Choose “Calculate triangle” for the job. Processing runs in this browser.

  3. 3

    Review the result under “Triangle measurements”, then copy or download it after checking the output.

Related tools

Keep working

IPv4 CIDR Calculator

Calculate network, broadcast, subnet mask and usable host range from IPv4 CIDR notation.

Percentage Calculator

Calculate a percentage of a number, what percent one number is of another, or percentage change.

Unit Converter

Convert common length, mass and temperature units with a simple value-from-to expression.

Date Difference Calculator

Calculate calendar days, weeks and exact duration between two ISO dates or date-times.

← Back to developer workbench