Square Feet Triangle Calculator

Square Feet of a Triangle

The square feet of a triangle is its area expressed in sq ft (ft²). Depending on what you know about the triangle, you can use the base-height formula, Heron's formula (three sides), SAS, or ASA methods. Our calculator converts units to feet and shows each step.

For more triangle tools, try our Triangle Calculator and 3 Sides Triangle Area Calculator.

Triangle Area Formulas

Base and height:

$$A = \frac{1}{2} \times b \times h$$

Three sides (Heron's formula):

$$A = \sqrt{s(s-a)(s-b)(s-c)}, \quad s = \frac{a+b+c}{2}$$

Side-angle-side:

$$A = \frac{1}{2} \times a \times b \times \sin(\gamma)$$

Worked Example

An equilateral triangle with all sides 6 ft has semiperimeter $s = 9$ ft. By Heron's formula, $A = \sqrt{9 \times 3^3} \approx 15.59$ sq ft.