Standard sheet material sizes in the UK

Sheet material is ordered in imperial names and cut in millimetres, which is where most of the confusion starts. Here is the whole table, both ways round.

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How many boards your parts actually need, with the layout of every cut.
NameMillimetresFeet and inchesNotes
8x42440 × 12208 ft 0.06 in × 4 ft 0.03 inThe standard sheet. Most MDF, plywood and MFC.
10x53050 × 152510 ft 0.08 in × 5 ft 0.04 inOversize. Fewer joins on tall wardrobes.
9x52745 × 15259 ft 0.07 in × 5 ft 0.04 inLess common oversize.
10x43050 × 122010 ft 0.08 in × 4 ft 0.03 inLong and narrow — tall doors without a join.
Egger MFC2800 × 20709 ft 2.24 in × 6 ft 9.50 inEgger board comes 2800 x 2070, not 8x4.
Egger MFC long4100 × 207013 ft 5.42 in × 6 ft 9.50 inThe long Egger panel.
Questions
Is an 8x4 sheet exactly 8 feet?

2440 mm is 8 ft and about 0.06 in — near enough that nobody minds, but the mm is the number the saw uses.

When is 10x5 worth the extra?

When a part is longer than 2440 mm, or when the bigger sheet saves a whole board. Run your list against both and compare.

Why is Egger board a different size?

It is made to 2800 × 2070 mm. It is not an 8x4 and planning as if it were will get your board count wrong.

Ordering
We cut, edge and deliver in the United Kingdom. Send your list — or the optimiser's result — to uniboards.co.uk and we will price it.