Sofa Size Calculator

How it is calculated

The tool leaves a gap at both ends of the wall and gives the rest to the sofa: sofa length = wall − 2 × clearance. Both values are in centimetres. If the clearance box is empty, or negative, the tool uses 45 cm per side. A clearance of 0 is accepted and gives a sofa as long as the wall. The seat count is floor(sofa length ÷ 60), based on about 60 cm per seat and rounded down to whole seats. The wall width must be above zero, and the clearance on both sides together must leave a positive length, otherwise there is no result. The depth of the sofa, armrest width and doorways are not considered, so treat the answer as the longest sofa that fits, not as an exact product size.

Common mistakes

• Entering the wall in metres or inches. Both fields are in centimetres, so a 3.6 m wall must be typed as 360.
• Thinking the clearance is the total gap. It is subtracted once per side, so 30 means 60 cm taken from the wall.
• Leaving the clearance blank and not noticing the 45 cm default per side, which shortens the sofa by 90 cm in total.
• Treating the seat count as exact. Seats are counted at 60 cm each and rounded down, but real sofas have arms that eat into the width.
• Measuring the wall at the skirting board only. A radiator, window sill or door swing can reduce the usable width.