How many 20" × 20" pieces can you cut from a 4×8 sheet?
You can cut 8 pieces of 20" × 20" from one 4×8 sheet (48" × 96") with a 1/8" saw kerf and rotation allowed — 69% of the sheet ends up in parts.
The layout is a straight grid, 2 across and 4 along the length. 69% is middling — 31% of the sheet is left over, so it pays to nest these together with other parts.
Kerf and grain
The 1/8" kerf doesn't cost a part here: 8 fit with or without it. There's still 7-3/4" × 96" left over after the last cut.
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 8.
| Saw kerf | Rotation allowed | Grain-locked (no rotation) |
|---|---|---|
| 1/8" | 8 · 69% | 8 · 69% |
| None (theoretical) | 8 · 69% | 8 · 69% |
How many sheets for a batch?
| Pieces needed | 4×8 sheets | Last sheet |
|---|---|---|
| 10 | 2 | 2 of 8 — room for 6 more |
| 25 | 4 | 1 of 8 — room for 7 more |
| 50 | 7 | 2 of 8 — room for 6 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 20x20 pieces can you cut from a 4×8 sheet?
You can cut 8 pieces of 20" × 20" from one 4×8 sheet (48" × 96") with a 1/8" saw kerf and rotation allowed — 69% of the sheet ends up in parts. The layout is a straight grid, 2 across and 4 along the length.
How many 4×8 sheets do I need for 25 pieces at 20" × 20"?
4 sheets. At 8 per sheet, the last one carries 1 part, leaving room for 7 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 20" × 20" 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: 8), 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
- 18" × 18" from a 4×8 sheet — 10 per sheet
- 24" × 24" from a 4×8 sheet — 3 per sheet
- 16" × 16" from a 4×8 sheet — 10 per sheet
- 30" × 30" from a 4×8 sheet — 3 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.