What is this calculator?
Calculate a rectangle’s area and perimeter.
What can you use it for?
Use it when solving an exercise, checking a result, or working with the particular quantities shown in this form. Calculate a rectangle’s area and perimeter.
How to use it
- Enter length.
- Enter width.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Area = length × width
Perimeter = 2 × (length+width)
Perimeter = 2 × (length+width)
The formula uses the units and definitions shown above. Each input is substituted before the arithmetic is evaluated; the calculated output is rounded for display.
Worked example
Length: 10, Width: 5. The result is 50 square units (area).
Assumptions and limits
Rectangle model. Use the circle or triangle tool for other shapes.
Frequently asked questions
What inputs does the Area Calculator need?
Use length, width. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Area Calculator?
Rectangle model. Use the circle or triangle tool for other shapes.