Rectangle Calculator
Calculate the area and perimeter of a rectangle from its width and height, with a labeled diagram.
How it works
- 1Enter the rectangle’s width and height.
- 2Read the area (width × height) and perimeter instantly.
- 3Check the labeled diagram to confirm your dimensions.
Use cases
- Measure flooring, paint, or fabric coverage.
- Find the perimeter for fencing or framing.
- Check homework on rectangle area and perimeter.
Frequently asked questions
How do you find the area of a rectangle?
Multiply width by height. For example, an 8 × 5 rectangle has an area of 40 square units.
How do you find the perimeter?
Add all four sides, which equals 2 × (width + height). An 8 × 5 rectangle has a perimeter of 26 units.
What units does this use?
Whatever unit you enter. If your sides are in metres, the area is in square metres and the perimeter in metres.
Related tools
See all →Calculate the area and circumference of a circle from its radius, with a labeled diagram.
Calculate the area (Heron’s formula) and perimeter of a triangle from its three sides.
Calculate the area and perimeter of a trapezoid from its two parallel sides, height, and legs.
Calculate the area and perimeter of a parallelogram from its base, height, and side.