Calculadora de Área de Triângulo
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
A = (base × altura) / 2
About this calculator
This triangle area calculator allows you to quickly compute the area of any triangle given its base and height. The formula used is the most basic in geometry: area = (base × height) / 2. Simply enter the values in the indicated fields and the result is displayed instantly.
The calculation is useful in various practical situations, such as in construction to determine the area of a triangular roof, in design projects or crafts, and in school math problems. The tool accepts decimal numbers and provides the result with two decimal places.
It is important to remember that the height must be perpendicular to the base. In non-right triangles, the height is the distance between the base and the opposite vertex, measured at a right angle. Make sure to use the same units for base and height to obtain the area in the corresponding square unit.
For triangles where the height is unknown, there are other formulas, such as Heron's formula or using sides and angles. This calculator is ideal when the base and height are available, providing speed and accuracy.
Frequently asked questions
Can I use this calculator for any type of triangle?
Yes, as long as you know the base and the perpendicular height. The formula works for equilateral, isosceles, scalene, and right triangles.
What if I don't know the height of the triangle?
You can use other formulas, such as Heron's formula (from the three sides) or the formula with two sides and the included angle. This calculator requires the height.
How do I measure the height of a triangle in practice?
The height is the perpendicular distance from the base to the opposite vertex. In a right triangle, one leg can be the height. In other cases, use a square or ruler to measure the perpendicular distance.
Does the calculator consider units of measurement?
No, you must use the same unit for base and height. The result will be in the corresponding square unit (e.g., cm², m²).
Can I calculate the area of a triangle with decimal sides?
Yes, the calculator accepts decimal numbers. The result will be displayed with two decimal places.