Easy to use online calculators to calculate the Area Ar, sides, diagonals, height and angles of a parallelogram. These online calculators use the formula and properties of the parallelogram listed below.
Area Ar of a parallelogram may be calculated using different formulas.
Ar = b × h = a × b sin(A) = a × b sin(B)
height: h = a sin(B)
Diagonals BD and AC (using law of cosine)
AC^{2} = a^{2} + b^{2} - 2 a b cos(B) BD^{2} = a^{2} + b^{2} - 2 a b cos(A) = a^{2} + b^{2} + 2 a b cos(B)
Internal angles
size of angle A = size of angle C , size of angle B = size of angle D
size of angle A + size of angle B = 180 ° (supplementary angles)

1 - Use Parallelogram Calculator Given sides a, b and angle A

Enter the sides a, b and angle A as positive real numbers and press "Calculate". The outputs are the area, the height, angle B and diagonals of the parallelogram.

2 - Use Parallelogram Calculator Given sides a, b and height h

Enter the sides a, b and height h as positive real numbers and press "Calculate". The outputs are the area, angleA, angle B and diagonals of the parallelogram.

3 - Use Parallelogram Calculator Given Area Ar, side a and height h

Enter the Area Ar, side a, and height h as positive real numbers and press "Calculate". The outputs are side b, angleA, angle B and diagonals of the parallelogram.

4 - Use Parallelogram Calculator Given diagonals AC and BD and side a

Enter the the diagonals and side as positive real numbers and press "Calculate". The outputs are side b, angleA, angle B, Area Ar and height h of the parallelogram.