Conversions
Area converter
Convert area measurements from square metres into common metric and imperial units.
Calculators / Math / Rectangle
Rectangle calculator
Find area and perimeter from two sides.
On this page
Area40square units
Perimeter26
Calculator controls
How to calculate
Find area and perimeter from two sides.
Area = length × width; perimeter = 2(length + width)
Worked example
Length: 8; Width: 5.
Area: 40 square units; Perimeter: 26 .
Assumptions and limits
Both dimensions must use the same unit.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Area is the surface inside the rectangle; perimeter is the distance around its four edges.
When this tool is useful
Compare floor coverage with the length of trim needed around a rectangular room.
Understanding your inputs
| Input | What to enter |
|---|---|
| Length | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Width | Enter a number of at least 0.000001 and no more than 1000000000000. |
Frequently asked questions
Does this work for a square?
Yes. Enter the same value for length and width.
Can I mix centimetres and metres?
Convert both measurements to the same unit before calculating. The result cannot correct mixed-unit inputs automatically.