How many 12" × 12" pieces can you cut from a 4×8 sheet?
You can cut 21 pieces of 12" × 12" from one 4×8 sheet (48" × 96") with a 1/8" saw kerf and rotation allowed — 66% of the sheet ends up in parts. Sizes like this are typical for signs, tiles and craft blanks.
The layout is a straight grid, 3 across and 7 along the length. 66% is middling — 34% of the sheet is left over, so it pays to nest these together with other parts.
Kerf and grain
On paper the sheet holds 32, but that is the no-kerf answer. Four 12" parts add up to exactly the sheet's 48", so there is no room left for even one 1/8" saw cut between them. Cut the parts at 11-7/8" × 11-7/8" instead and you get all 32 back.
Squares don't care about rotation, so grain direction is free: lay every piece with the grain running the 96" length and the count stays at 21.
| Saw kerf | Rotation allowed | Grain-locked (no rotation) |
|---|---|---|
| 1/8" | 21 · 66% | 21 · 66% |
| None (theoretical) | 32 · 100% | 32 · 100% |
How many sheets for a batch?
| Pieces needed | 4×8 sheets | Last sheet |
|---|---|---|
| 10 | 1 | 10 of 21 — room for 11 more |
| 25 | 2 | 4 of 21 — room for 17 more |
| 50 | 3 | 8 of 21 — room for 13 more |
Same 1/8" kerf, rotation allowed. A part-filled last sheet is the place to nest drawer bottoms, shelves or anything else from the same material.
FAQ
How many 12x12 pieces can you cut from a 4×8 sheet?
You can cut 21 pieces of 12" × 12" from one 4×8 sheet (48" × 96") with a 1/8" saw kerf and rotation allowed — 66% of the sheet ends up in parts. The layout is a straight grid, 3 across and 7 along the length.
Why only 21 and not 32?
On paper the sheet holds 32, but that is the no-kerf answer. Four 12" parts add up to exactly the sheet's 48", so there is no room left for even one 1/8" saw cut between them. Cut the parts at 11-7/8" × 11-7/8" instead and you get all 32 back.
How many 4×8 sheets do I need for 25 pieces at 12" × 12"?
2 sheets. At 21 per sheet, the last one carries 4 parts, leaving room for 17 more.
How this was worked out
EZNESTING's nesting engine (the same one the optimizer runs, in its default least-waste guillotine mode) was given more 12" × 12" parts than could possibly fit on one 48" × 96" sheet, with a 1/8" kerf between parts and none at the factory edges. The parts it placed are the answer. That count is checked against simple grid layouts in both orientations (best of those: 21), so the page never shows less than a straight grid would give. No edge trim is assumed; if you skim 1/4" off a factory edge, re-run it in the optimizer with trim set.
Nearby sizes
- 10" × 10" from a 4×8 sheet — 36 per sheet
- 16" × 16" from a 4×8 sheet — 10 per sheet
- 8" × 8" from a 4×8 sheet — 55 per sheet
- 18" × 18" from a 4×8 sheet — 10 per sheet
Try any size in the sheet yield calculator, or lay out a full cut list with the plywood cut list optimizer, the 4×8 plywood cut calculator or the nesting optimizer.