Rectangle Calculator

Your details

Pick which two values you already know; the rest will be calculated.
The longer side of the rectangle.
m
The shorter side of the rectangle.
m
Area
40

Length times width

Perimeter26
Diagonal9.434
Length8
Width5
Circumradius4.717
Inradius2.5
Aspect ratio1.600
Area unitm²
Length unitm

Area: 40.00 m², Perimeter: 26.00 m

  • The area is 40.00 m² and the perimeter is 26.00 m.
  • The diagonal spans 9.43 m, which is also the diameter of the smallest circle that can contain this rectangle.
  • The length-to-width ratio is close to the golden ratio (1.618), often considered visually harmonious.
  • Isoperimetric efficiency: 23.7% (a square with the same perimeter would have 6.50m sides and 42.25 m² of area).

Next stepUse the "Known values" selector above to work backwards from area, perimeter, or diagonal if you need to find a missing side.

 = Powered by OnlyCalculators