Kite Area Calculator
The kite area calculator finds the area of a kite if you enter diagonals or two sides and the angle between them. Additionally, it can calculate the kite's perimeter.
The formula
A = ½ d₁d₂, the same as a rhombus
Why the diagonal formula works
A kite’s diagonals cross at right angles, so it splits into four right triangles whose legs are the diagonal halves. Adding them gives ½d₁d₂ — the same formula as a rhombus, which is simply a kite with all four sides equal.
Area scales with the square
Double every length in a flat shape and the area quadruples; triple them and it grows ninefold. Perimeter, being a length, scales in step with the sides. That mismatch is why bigger shapes enclose proportionally more area per unit of edge — and why a circle, having no corners at all, encloses the most area for a given perimeter of any shape.
Units
Whatever unit you enter, the area comes out in that unit squared and the perimeter in the unit itself. The calculator is unit-agnostic — enter centimetres and read cm and cm², or feet and read ft and ft². Just do not mix units between fields.