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Triangle Area Calculator (Base and Height)

Find the area of a triangle from its base and height. The formula is area = base times height divided by 2, shown with a clear diagram of the triangle.

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Input

Enter the base and height to automatically calculate the area of the triangle.

Result

base = 8height = 5

Area S

20

Base b

8

Height h

5

Calculated as area = base times height divided by 2.

Enter the base and height in the same unit. The area is in that unit squared.

How it works

  • The area is found with the formula area = base times height divided by 2.
  • The height is measured perpendicular to the base, not the length of a slanted side.
  • Enter the base and height in the same unit, such as cm. The area is in that unit squared.
  • Both the base and the height must be positive numbers.

Frequently asked questions

How is the area calculated from base and height?
It uses area = base ร— height รท 2. For example, a base of 6 cm and a height of 4 cm give 6 ร— 4 รท 2 = 12 cmยฒ.
When should I use this instead of the Heron's formula tool?
Use this tool when you know the base and its perpendicular height. If you only know the three side lengths a, b and c, the Heron's formula tool is the right choice since it needs no height.
Is the height the length of the slanted side?
No. The height is the perpendicular distance measured at a right angle to the base, not the length of a slanted side. Enter base and height in the same unit, and both must be positive.

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