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L-shaped room area calculator

Find the floor area of an outer rectangle with one rectangular corner removed.

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Your result

L-shaped area24m²
Outer rectangle area30m²
Removed rectangle area6m²

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How to calculate

L-shaped room areaL-shaped room areaL-shaped room areaCalculate the large rectangle first and subtract the missing corner once. A 6 by 5 room with a 2 by 3 cut-out has area 24 square metres. Concept diagram; not to scale.L-shaped room areaOuter width (m)6Outer length (m)5L-shaped area24 m²MyCalCute.comOuter width (m)6Outer length (m)5L-shaped area24 m²
L-shaped room areaCalculate the large rectangle first and subtract the missing corner once. A 6 by 5 room with a 2 by 3 cut-out has area 24 square metres. Concept diagram; not to scale.L-shaped room areaOuter width (m)6Outer length (m)5L-shaped area24 m²MyCalCute.com
Calculate the large rectangle first and subtract the missing corner once. A 6 by 5 room with a 2 by 3 cut-out has area 24 square metres. Concept diagram; not to scale.

Find the floor area of an outer rectangle with one rectangular corner removed.

L-shaped area = width*length-cutWidth*cutLength m²
Outer rectangle area = width*length m²
Removed rectangle area = cutWidth*cutLength m²

Worked example

  • Outer width (m): 6
  • Outer length (m): 5
  • Cut-out width (m): 2
  • Cut-out length (m): 3
  • L-shaped area: 24 m²
  • Outer rectangle area: 30 m²
  • Removed rectangle area: 6 m²

Assumptions and limits

All corners are right angles and dimensions are horizontal internal measurements. The cut-out must fit inside the outer rectangle. Material waste is not included.

Results are rounded for display; calculations use unrounded values. Read our calculation methodology.

Understanding the result

Find the floor area of an outer rectangle with one rectangular corner removed. Calculate the large rectangle first and subtract the missing corner once. A 6 by 5 room with a 2 by 3 cut-out has area 24 square metres.

When this tool is useful

Calculate the large rectangle first and subtract the missing corner once. A 6 by 5 room with a 2 by 3 cut-out has area 24 square metres.

Understanding your inputs

InputExample
Outer width (m) width6
Outer length (m) length5
Cut-out width (m) cutWidth2
Cut-out length (m) cutLength3

Frequently asked questions

What does this estimate leave out?

All corners are right angles and dimensions are horizontal internal measurements. The cut-out must fit inside the outer rectangle. Material waste is not included.

How do I check the example?

Use the stated units and the formula below. Keep full precision until the final answer; change one input at a time to see its effect.

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