Metric Unit Calculator
Math calculator

Right Triangle Area Calculator

Calculate the area of a right triangle from its two perpendicular legs.

Triangle area: -
Visual representation

Right Triangle Area Calculator diagram

The diagram updates with your entries and is illustrative, not necessarily drawn to scale.

Calculation explained

How this result was calculated

The formula, your substituted values, and the evaluated result are shown below.

The entered legs must meet at a right angle. The result uses square units.
Recommended resources

Products that may help

Recommended

Udemy Education

Udemy is an AI-powered skills acceleration platform transforming how companies and individuals across the world build the capabilities needed to thrive in a rapidly evolving workplace.

View offerAffiliate link — we may earn a commission at no extra cost to you.

How the Right Triangle Area Calculator works

Calculate the area of a right triangle from its two perpendicular legs.

Formula

legA × legB ÷ 2

How to use this calculator

  1. Enter every measurement using one consistent length or angle unit.
  2. Select Calculate to evaluate the formula.
  3. Review the substituted values in the calculation explanation.

Interpretation and limitations

The entered legs must meet at a right angle. The result uses square units. Decimal answers are rounded for display; retain additional precision for subsequent calculations.

Geometry collection

This calculator belongs to the Plane Geometry section of the Math calculator library.

Keep exploring
2D Coordinate DistanceCalculate distance using the 2d coordinate distance formula.2D Distance CalculatorFind the straight-line distance between two points in a Cartesian plane.3D Coordinate DistanceCalculate distance using the 3d coordinate distance formula.3D Distance CalculatorFind the straight-line distance between two points in three-dimensional Cartesian space.AAA Triangle Theorem CalculatorFind a triangle’s third angle from two known angles in an AAA configuration.AAS Triangle Theorem CalculatorFind a target side using two angles and one non-included side (AAS).