Triangle Calculator

Calculate area, perimeter, angles, and sides of any triangle in real-time with visual representation. Free, instant, and accurate geometric calculations.

Enter Triangle Dimensions

Provide any 3 elements (sides or angles) to calculate the full triangle

cm
°
cm
°
cm
°

Calculation Results

Area
0 cm²
Perimeter
0 cm
Height (from A)
0 cm
Triangle Type
-

Triangle Visualization

A
B
C

Triangle Properties

  • Side A: 0 cm
  • Side B: 0 cm
  • Side C: 0 cm
  • Angle α: 0°
  • Angle β: 0°
  • Angle γ: 0°

About This Tool

Our Triangle Calculator is a powerful, free online tool designed to solve any triangle quickly and accurately. Whether you're a student, teacher, engineer, or DIY enthusiast, this calculator provides instant solutions for all triangle properties.

What can this tool do?

  • Calculate all sides and angles of any triangle
  • Determine area, perimeter, and heights
  • Identify triangle type (scalene, isosceles, equilateral, right, etc.)
  • Visualize triangles with accurate proportions
  • Solve triangles using any combination of three known values

Who is this tool for?

This tool is essential for:

  • Students learning geometry and trigonometry
  • Teachers creating lesson plans and assignments
  • Engineers and architects needing quick calculations
  • DIY enthusiasts working on construction projects
  • Anyone who needs to solve triangle problems

Why use our Triangle Calculator?

Unlike other calculators, our tool provides:

  • Real-time calculations and visualizations
  • Bidirectional solving (from sides or angles)
  • Responsive design that works on all devices
  • No registration or payment required
  • Detailed results with step-by-step explanations

Frequently Asked Questions

How does the Triangle Calculator work?

Our calculator uses the Law of Sines and Law of Cosines to determine unknown sides and angles based on any three known values (sides or angles). It instantly calculates all properties and renders the triangle visually.

What information do I need to calculate a triangle?

You need any three elements of the triangle. This could be three sides (SSS), two sides and one angle (SAS or SSA), or two angles and one side (ASA or AAS). The calculator will determine the rest.

Can I calculate a right triangle with this tool?

Yes! Simply enter the two legs or a leg and the hypotenuse, and the calculator will recognize it as a right triangle. You can also enter one angle as 90 degrees.

Is this tool completely free to use?

Absolutely! Our Triangle Calculator is 100% free with no hidden costs, registration requirements, or usage limits. We believe in providing accessible educational tools for everyone.

Does the calculator support different units?

The calculator works with any consistent unit (cm, inches, meters, etc.). Just make sure to use the same unit for all side measurements. Angles are always in degrees.

Can I save or export my calculations?

While there's no direct export feature, you can take screenshots of your results. All calculations happen in your browser, so your data remains private.