Triangle Calculators
If you know any two measurements of a triangle, one of these tools can usually solve for the rest: a right triangle from two known values, the Pythagorean theorem for a missing side, or the fixed ratios of a 30-60-90 or equilateral triangle.
Calculators & Tools
30-60-90 Triangle Calculator
The 30-60-90 Triangle Calculator computes all three side lengths of a 30-60-90 special right triangle when you enter any one known side. It applies the fixed 1 to square-root-of-3 to 2 ratio to find the remaining two sides instantly. Use it for geometry homework, architectural drafting, and trigonometry problems involving this widely used special triangle.
Hypotenuse Calculator
Calculates the hypotenuse of a right triangle given the two legs using c = sqrt(a² + b²). Also outputs the two acute angles, area, and perimeter.
Pythagorean Theorem Calculator
Calculates the missing side of a right triangle using the Pythagorean theorem. Can find hypotenuse from two legs, or either leg from the hypotenuse and the other leg. Also outputs triangle area and perimeter.
Area of a Right Triangle Calculator
Calculates the area of a right triangle using three methods: two legs (A = ab/2), base and height (A = bh/2), or hypotenuse and one angle. Also shows perimeter and hypotenuse where applicable.
Right Triangle Calculator
Solves a right triangle given two sides, or given hypotenuse and one angle. Returns all three sides, both non-right angles, area, and perimeter.
Equilateral Triangle Calculator
The Equilateral Triangle Calculator computes all properties of an equilateral triangle, including area, height, perimeter, circumradius, and inradius, from any one known measurement such as the side length or area. All three sides and angles (60° each) are equal.