This triangle calculator calculates the sides, angles, perimeter and area of any triangle no matter of its type (right, isosceles, equilateral) based on the values you know. There is in depth information about the formulas used below the form.

Side a:
Side b:
Side c:
Angle A:
Angle B:
Angle C:

How does this triangle calculator work?

In order to perform a triangle calculation the user should input any 3 (any 3 combination between sides and angles) out of the 6 sides and angles fields. Please note that the angles can be expressed either in grades or radians.

This triangle calculator is based on the following formulas (please take account that the applicable notations are the ones from the image provided below the form):

    • Sine rule:

Sine rule

    • Cosine rule:

Cosine rule

    • Area of a triangle formula based on Heron's equation:

Area of a triangle formula

  • Triangle perimeter formula:

Triangle perimeter formula

11 Apr, 2015