Rectangle Length and Width Calculator

Your details

Choose which two values you already know. The calculator solves for the remaining dimensions.
Total area enclosed by the rectangle.
m²
Total distance around the rectangle. Required when solving from area and perimeter.
m
Length (longer side)
6m

The longer dimension of the rectangle

Width (shorter side)4m
Diagonal7.2111m
Area24m²
Perimeter20m
Aspect ratio3:2

Length 6.0000, Width 4.0000.

  • The longer side (length) is 6.0000 and the shorter side (width) is 4.0000, giving an aspect ratio of 3:2.
  • The diagonal is 7.2111, computed via the Pythagorean theorem: √(L² + W²).
  • A rectangle with these proportions is fully defined: every property (area, perimeter, diagonal) is uniquely determined.

Next stepUse the aspect ratio to scale these dimensions up or down while keeping the same proportions, or re-solve in a different mode to cross-check.

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