# Triangle Area Calculator

URL: https://speedycalculator.com/calculators/math/triangle-area/
Last updated: 2026-10-25

> The triangle area calculator finds the area of a triangle from its base and height, or from two sides and the angle between them. Both methods give the same result for the same triangle.

## Inputs

- Base (m, cm, mm, km, in, ft, yd, mi)
- Height (m, cm, mm, km, in, ft, yd, mi)

## Results

- Area

## Formula

```
Area = ½ × base × height
Area = ½ × a × b × sin(C)
```

## Explanation

Any triangle’s area is half that of the parallelogram it forms with a copy of itself.

### How to use the Triangle Area Calculator

- **Base**
- **Height**
- Want to work backwards? Type a value into **Area** and **Height** is calculated for you.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Multiply base by perpendicular height and halve it. With two sides and the included angle, use the sine formula.

### Inputs explained

FieldWhat to enterBaseUnits: m, cm, mm, km, in, ft …HeightUnits: m, cm, mm, km, in, ft …

### Example values

How the main result changes when **Height** changes and everything else stays at the example values above:

Height (m)Area (m²)3154.522.56307.537.59451260

## Worked example

Inputs — Base: 10 m; Height: 6 m.

Results — **Area = 30 m²**.

## FAQ

**What is the height of a triangle?**
The perpendicular distance from the base to the opposite vertex.

**What if I only know three sides?**
Use Heron’s formula.

**What formula does the Triangle Area Calculator use?**
Area = ½ × base × height.

**Can I work backwards from the result?**
Yes. Type the result you want into Area and the calculator finds the matching height.