Triangle Calculator – Area, Angles & Sides (All Types)

Solve any triangle: find area, angles, sides — supports SSS, SAS, ASA, AAS, right & general triangles. 100% free · Instant results · Works in your browser.

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Triangle Type / Known Values:

Side a

—

Side b

—

Side c

—

Angle A

—

Angle B

—

Angle C

—

Area: —

Why Use This Triangle Calculator?

  • Calculate the area of any triangle quickly and accurately
  • Find all unknown sides and angles for SSS, SAS, ASA, AAS, or right triangles
  • Helpful for students, engineers, architects, and geometry enthusiasts
  • Eliminates manual calculation errors and saves time
  • Free, easy-to-use, and works on any device

How to Use Triangle Calculator (3 Easy Steps)

  1. Select the known values (sides and/or angles) of your triangle
  2. Enter the corresponding measurements in the input fields
  3. Click “Calculate” to see the area, unknown sides, and angles instantly

Frequently Asked Questions (FAQ)

What types of triangles can this calculator solve?
This calculator works for all types of triangles: scalene, isosceles, equilateral, and right triangles.

Can I calculate area if I know only sides?
Yes, using Heron’s formula, the calculator can compute the area from all three sides (SSS).

Can I find unknown angles and sides?
Yes, it can solve for unknown sides and angles using standard triangle rules like Law of Sines and Law of Cosines.

Who should use this triangle calculator?
Students, teachers, engineers, architects, and anyone working with geometry can use it for accurate calculations.

How accurate are the calculations?
The calculator uses precise mathematical formulas, providing accurate and reliable results instantly.

Is this triangle calculator free to use?
Yes, it is completely free, online, and requires no registration.