Plywood Sheet Calculator
Enter every part you need to cut. This calculator runs the same nesting logic SawReady uses in the full app, so it gives you the real sheet count for your parts, not an area-plus-a-margin estimate. Kerf, part rotation and offcut usability are all counted. Results are calculated on your device; nothing is uploaded.
How this calculator works
Area math alone underestimates real sheet counts, because parts do not always nest onto a rectangle even when their total area fits. Three shelves of 2200 × 450 mm add up to 99.77% of one 2440 × 1220 mm sheet by area, yet only two fit, the third needs a whole second sheet. This calculator runs the actual nesting: it places each part on a sheet with kerf between cuts, rotates parts where that helps, and opens another sheet only when the current one genuinely cannot take another part. The number you see is the number to buy.
What the inputs mean
- Sheet size. The full sheet you plan to buy. The standard is 2440 × 1220 mm (8 × 4 ft). Pick any preset or set a custom size.
- Kerf. The strip of material each cut removes. A typical circular saw blade is around 3 mm, a track saw a little less, a panel saw at the yard usually 3 to 4 mm. Default is 3 mm.
- Part dimensions. The finished size of each part in millimetres, plus how many of that part you need. Duplicates go on one row with the quantity, not on separate rows.
Worked example: garage shelves
Try it: a garage shelving unit, 900 mm wide, 450 mm deep, 1800 mm tall. Two side panels of 1800 × 450 mm, and four shelves of 864 × 450 mm (shelf length is the overall width minus two 18 mm panel thicknesses). Enter those two rows on a 2440 × 1220 mm sheet with a 3 mm kerf and calculate. The answer is 2 sheets, and the layout leaves large usable offcuts on both sheets.
The area shortcut agrees here: total part area is 3,175,200 mm², one sheet is 2,976,800 mm², so 1.07 sheets before a waste factor. Multiplied by 1.2 that rounds up to 2. The two methods match for small projects with few parts, and can diverge sharply on bigger cut lists.
Common part sizes in one sheet
A rough guide to how many typical parts fit on a single 2440 × 1220 mm sheet with a 3 mm kerf, no grain constraints, rotation allowed:
| Part size (mm) | Parts per sheet | Common use |
|---|---|---|
| 600 × 400 | 12 | Kitchen cabinet sides / doors |
| 1200 × 600 | 4 | Worktop cores, wardrobe sides |
| 450 × 300 | 21 | Cabinet backs, drawer sides |
| 2200 × 450 | 2 | Long shelves, alcove wall boards |
| 1800 × 450 | 2 | Wardrobe / bookcase side panels |
Counts are the maximum on one sheet with rotation allowed and no grain constraints. Real projects usually mix sizes, in which case the calculator above gives the true sheet count.
Related guides
- How many sheets of plywood do I need? , the full method for working out sheet counts by hand.
- Plywood vs MDF , which sheet material to pick for your project.
- How much plywood for a wardrobe? , a full worked cut list.
- How many sheets for kitchen cabinets? , worked cabinet cut list.