Rhombus Calculator

Calculations at a rhombus. A rhombus is a quadrilateral with four sides of equal length. Opposite sides are parallel.
Enter the side length and one angle and choose the number of decimal places. Then click Calculate. Please enter angles in degrees, here you can convert angle units.

	Side length (a):
	First angle (α):
	Second angle (β):
	Perimeter (p):
	Area (A):
	First diagonal (e):
	Second diagonal (f):
	Incircle radius (ri):
	Height (h):
	Round to   0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15   decimal places.

Side length, diagonal, perimeter, radius and height have the same unit (e.g. meter), the area has this unit squared (e.g. square meter).

Diagonals and median lines meet in one point, this is the incircle center and the centroid. To this, the rhombus is point symmetric and rotationally symmetric at a rotation of 180° or multiples of this. Furthermore, the rhombus is axially symmetric to the diagonals. The diagonals are identical with the bisecting lines. The lengths of the median lines are equal to the lengths of the according parallel sides. The bisectors divide the rhombus into four smaller, equal-sized rhombi that are similar to the original rhombus. Since all sides of a rhombus have the same length, only the length of one side is given.

perimeter p, area A

sides and angles

diagonals

height

median lines

incircle

The rhombus is a special case of the parallelogram and the kite and has as a famous special case the square, which is a right-angled rhombus. The rhombus can also be viewed as a distorted square. Rhombi form the side surfaces of the rhombohedron, the rhombic dodecahedron and the rhombic triacontahedron.
With the rhombus, a surface can be tiled without gaps, either regularly or in irregular Penrose tiling.

Last updated on 03/31/2026. Author: Jürgen Kummer

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