Rectangle Calculator

Free online rectangle calculator tool.

Width

Height

What Is a Rectangle Calculator?

The Rectangle Calculator instantly determines the total area and the perimeter of a rectangle when provided with its width and height. This free online tool is useful for rectangle calculator, rectangle area calculator, rectangle perimeter calculator. Common use cases include floor area, room measurements, geometry homework, construction, and perimeter calculations. It is designed for quick browser-based calculations and is suitable for homework, programming, study, everyday math, and checking results.

How to Use This Rectangle Calculator

1
Enter WidthType one side length of the rectangle.
2
Enter HeightType the other side length.
3
CalculateThe tool computes both area and perimeter.
4
Review UnitsArea is expressed in square units and perimeter in linear units.
5
Use the ResultApply the measurements to geometry, planning, or construction calculations.

Frequently Asked Questions

In geometry, length and width are interchangeable when calculating rectangles. It does not matter which number you put in which input box.

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.

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.

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