Fill in any two of base, height and area, then click Calculate. The tool uses Area = Base × Height ÷ 2 to compute the remaining value automatically.
This calculator is based on the triangle area formula: Area = Base × Height ÷ 2. Knowing any two of base, height and area lets you solve for the third.
If you know base and height, Area = Base × Height ÷ 2. If you know area and base, Height = 2 × Area ÷ Base. If you know area and height, Base = 2 × Area ÷ Height.
Triangle area is widely used in roof design, land measurement, structural engineering and graphic design. This tool lets you perform these conversions quickly.
Make sure all values are greater than 0 and use consistent units (for example, all in meters, centimeters or millimeters) so the result remains meaningful.
Area = Base × Height ÷ 2.
Area = 6 × 4 ÷ 2 = 12 m².
Height = 2 × Area ÷ Base = 2 × 10 ÷ 5 = 4 m.
Because a triangle can be seen as half of a rectangle with the same base and height, so its area is half the rectangle’s.
Yes. Take one leg as the base and the other leg as the height, then Area = Base × Height ÷ 2.
If the units differ, for example meters and centimeters, the computed area will not correctly reflect the real size.
No. This calculator is based on the base-height formula. For three sides you would use Heron’s formula, which is a different method.
Yes. All three fields accept decimal values for more precise calculations.
Students, teachers, engineers, designers and anyone who needs triangle area conversions.
Base and height represent physical dimensions and must be positive; negative values have no geometric meaning.
This tool helps you find the third value when any two of base, height and area of a triangle are known. Useful for learning, design and everyday geometry calculations.
Scan the QR code to use this tool on mobile.