Rectangle Area and Perimeter Calculator
Find the area and perimeter of a rectangle from its length and width. Use any consistent unit, and the area is returned in that unit squared.
8 of 8 free uses remaining today
Find the area and perimeter of a rectangle from its length and width. Use any consistent unit, and the area is returned in that unit squared.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (length = 8, width = 5), the results are: area 40; perimeter 26.
Quick reference: length vs result
Reference table based on the example values; it is not your calculation result.
| Length | Area | Perimeter |
|---|---|---|
| 4 | 20 | 18 |
| 8 | 40 | 26 |
| 16 | 80 | 42 |
| 40 | 200 | 90 |
| 80 | 400 | 170 |
| 160 | 800 | 330 |
Frequently asked questions
What formula does this calculator use?
Area = l × w; Perimeter = 2 × (l+w). Variables: l = length, w = width.
What do I need to enter?
You need length, width. Results update as you type.
What is an example result?
With the default inputs (length = 8, width = 5), the results are: area 40; perimeter 26.
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