Rectangle Calculator
Free online rectangle calculator tool.
About Rectangle Calculator
The Rectangle Calculator instantly determines the total area and the perimeter of a rectangle when provided with its width and height.
How Rectangle Calculator Works
- Step 1: Width & Height: Enter the two lengths of the rectangle's sides.
- Step 2: Calculate: Area is found by multiplying width by height. Perimeter is found by adding all four sides together: 2 × (width + height).
Frequently Asked Questions
Are width and length the same thing?
In geometry, length and width are interchangeable when calculating rectangles. It does not matter which number you put in which input box.
What units should I use?
The calculator is unit-agnostic. If you input meters, your area will be square meters. Just ensure BOTH inputs use the exact same unit before calculating.
Can a rectangle have equal sides?
Yes! A rectangle with four equal sides is called a square. The calculator will still work perfectly if you input the same number in both fields.