What you get
Calculate a rectangle diagonal from its length and width.
How to use it
Enter only the requested values and check the unit shown beside each field. The main result gives the figure to use first. Details explain conversions, secondary quantities and rounding. Change any value to compare another situation without starting again.
Before using the result
Enter the rectangle’s length and width in the same unit. The diagonal will use that unit. This calculation uses the Pythagorean theorem and assumes a rectangle with four right angles, so check the actual shape before using the result for cutting or purchasing materials.