Calculating the Area of a Triangle
Learn how to calculate the area of a triangle with base and height, plus simple examples and common mistakes.
๐งฎ
Use our free Scientific Calculator Get instant, accurate results โ no sign-up needed.
Open Calculator โ
Searching calculating the area of a triangle means you want one of the most common geometry formulas.
Triangle Area Formula
Area = 1/2 x Base x Height
Example
If a triangle has:
- Base = 10
- Height = 6
Area = 1/2 x 10 x 6 = 30 square units
Common Mistake
Do not use a slanted side in place of the height unless it is actually perpendicular to the base.
The Bottom Line
To calculate the area of a triangle, multiply the base by the perpendicular height and divide by 2.
How to Calculate: Step-by-Step Guide
1
Measure the base
Use the full base length of the triangle.
2
Measure the perpendicular height
The height must be at a right angle to the base.
3
Multiply and divide by two
Use one-half times base times height.
๐งฎ
Ready to calculate? Try our Scientific Calculator Free, fast, and accurate โ right in your browser.
Use Scientific Calculator โ