How do I use the Triangle Area Calculator?
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Triangle Area Calculator
Find triangle area from base and height. Enter your values, review the formula, and use the worked result as a quick check for everyday planning.
Triangle Area Calculator
Find triangle area from base and height.
e.g., cm, m, ft, in
e.g., cm, m, ft, in
Results
Area
20 sq units
Formula: Area = (base * height) / 2
Triangle Area from Base and Height
Calculate the area of any triangle given its base and height. One of the most fundamental geometry calculations, used in construction, land surveying, and design.
Formula
Area = (Base × Height) ÷ 2. The height must be perpendicular to the base. This works for all triangles — right, acute, or obtuse — as long as the correct height is measured.
Worked example
Base 10, height 4: area = (10 × 4) ÷ 2 = 20 sq units. A triangular garden bed with 6 m base and 3 m height covers 9 m².
Practical guidance
Finding the correct height
Height is the perpendicular distance from the base to the opposite vertex. For right triangles, one leg can serve as height if the other is the base. For obtuse triangles, the height may extend outside the triangle.
Alternative area formulas
If you do not have base and height but know two sides and the included angle: Area = ½ × a × b × sin(C). If you know all three sides, use Heron's formula. This calculator works with base and height only.
Frequently asked questions
What formula does this calculator use?
Area = (base * height) / 2
Can I use decimal values?
Yes. Decimal inputs are supported for most calculators. Integer-based tools use rounded integer values where appropriate.
Is this calculator free?
Yes. CalcuNimble calculators are free and optimized for fast everyday use.