Free Triangle Calculator: Geometry Solver 2025

Triangle Calculator

Side a Side b Side c

Angle A (°) Angle B (°) Angle C (°)

Round to 0 decimal places 1 decimal place 2 decimal places 3 decimal places 4 decimal places 5 decimal places 6 decimal places

What is a Triangle Calculator?

A Triangle Calculator solves for properties of a triangle, including sides, angles, area, perimeter, and more, based on inputs like sides or angles. It’s widely used by students, engineers, and architects for geometry, trigonometry, and design problems, offering a quick way to analyze triangles without manual calculations.

Key Features of Our Calculator

• Flexible Inputs: Enter any combination of sides (a, b, c) and angles (A, B, C) to solve the triangle.
• Detailed Results: Get area, perimeter, height, inradius, circumradius, medians, and triangle type.
• Visualization: View a scaled diagram of the triangle with labeled sides and angles.
• Precision: Round results from 0 to 6 decimal places for accuracy.

How to Use the Calculator

Enter known values, select decimal places, and click Calculate:

• Inputs: Provide at least three values (e.g., sides a=3, b=4, c=5 or a=3, b=4, A=30°).
• Decimal Places: Choose how to round results (e.g., 2 decimal places).
• Calculate: View solved sides, angles, area, and a diagram.
• Clear: Reset inputs and results to start over.

Simplify your triangle calculations with our free Triangle Calculator. Try it now!