Parallelogram Calculator and Solver

Easy to use online calculators to calculate the area Ap, sides, diagonals, height and angles of a parallelogram. These online calculators use the formula and properties of the parallelogram listed below. parallelogram 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)
AC2 = a2 + b2 - 2 a b cos(B)
BD2 = a2 + b2 - 2 a b cos(A) = a2 + b2 + 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.

Side a = , Side b = , Angle A =
Decimal Places =
Area Ap =
Height h =
Angle B =
Diagonal AC =
Diagonal BD =


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.

Side a = , Side b = , Height h =
Decimal Places =
Area Ap =
Angle A =
Angle B =
Diagonal AC =
Diagonal BD =


3 - Use Parallelogram Calculator Given area Ap, side a and height h

Enter the area Ap, 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.

Area Ap = , Side a = , Height h =
Decimal Places =
Side b =
Angle A =
Angle B =
Diagonal AC =
Diagonal BD =


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 Ap and height h of the parallelogram.

Diagonal AC = , Diagonal BD = , Side a =
Decimal Places =
Side b =
Area =
Angle A =
Angle B =
Height h =

More References and Links

parallelogram
 Parallelogram Problems
Online Geometry Calculators and Solvers.

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