Hardboard cut list optimizer
Hardboard (often called Masonite) is a dense, thin fiberboard used for cabinet backs, drawer bottoms, templates, jigs and pegboard. Plan many small parts efficiently on a single sheet.
Parts
| Label | Length in | Width in | Qty | Grain | Remove |
|---|---|---|---|---|---|
Stock sheets
| Name | Length in | Width in | Qty | Grain | Price | Remove |
|---|---|---|---|---|---|---|
1 sheet, 23.5% waste, 10 of 10 parts placed.
You need: 1 × 1/4 in Hardboard (96″ × 48″)
Cut sequence (18 cuts)
- Crosscut 30″ from the 96″ × 48″ piece
- Rip 23″ from the 30″ × 48″ piece
- Rip 23″ from the 30″ × 24 7/8″ piece
- Crosscut 21 1/2″ from the 65 7/8″ × 48″ piece
- Rip 20 1/2″ from the 21 1/2″ × 48″ piece
- Crosscut 8″ from the 21 1/2″ × 27 3/8″ piece
- Rip 12″ from the 8″ × 27 3/8″ piece
- Rip 12″ from the 8″ × 15 1/4″ piece
- Rip 12″ from the 13 3/8″ × 27 3/8″ piece
- Crosscut 8″ from the 13 3/8″ × 12″ piece
- Crosscut 8″ from the 13 3/8″ × 15 1/4″ piece
- Rip 12″ from the 8″ × 15 1/4″ piece
- Rip 21 1/2″ from the 44 1/4″ × 48″ piece
- Crosscut 20 1/2″ from the 44 1/4″ × 21 1/2″ piece
- Crosscut 21 1/2″ from the 23 5/8″ × 21 1/2″ piece
- Rip 20 1/2″ from the 21 1/2″ × 21 1/2″ piece
- Crosscut 21 1/2″ from the 44 1/4″ × 26 3/8″ piece
- Rip 20 1/2″ from the 21 1/2″ × 26 3/8″ piece
Every cut goes straight through the piece. Distances are measured from the top or left edge of the piece as drawn; the kerf is on the waste side of each line.
Reusable offcuts (6)
- 22 5/8″ × 26 3/8″
- 21 1/2″ × 5 3/4″
- 5 1/4″ × 15 1/4″
- 5 1/4″ × 12″
- 8″ × 3 1/8″
- 8″ × 3 1/8″
Hardboard thickness: nominal vs actual
| Sold as | Typical actual | Metric |
|---|---|---|
| 1/8 in | 0.125 in | 3.2 mm |
| 3/16 in | 0.1875 in | 4.8 mm |
| 1/4 in | 0.25 in | 6.4 mm |
Thicknesses vary by mill and batch. Measure your own sheets with calipers before cutting dados, rabbets or setting joinery.
Hardboard is smooth on one or both sides and has no grain, so parts can be rotated freely. Tempered hardboard is impregnated with oil for extra hardness and moisture resistance; standard hardboard is cheaper for backs and drawer bottoms.
Drawer bottoms and cabinet backs are classic cut list parts: many identical rectangles that nest perfectly on a sheet. Remember to add the depth of the groove or rabbet on each edge — for a 1/4-inch groove 1/4 inch deep, a drawer bottom is 1/2 inch larger in each direction than the inside of the box.
Pegboard holes are on a 1-inch grid. If you want the holes to line up across panels, make part sizes whole inches from a hole center and turn off rotation for those parts.
Sheet weight
| Typical density | 55–65 lb/ft³ (881–1041 kg/m³) |
|---|---|
| 1/4 in 4×8 sheet | 37–43 lb (17–20 kg) |
| Grain | No — parts rotate freely |
Cutting hardboard
Fine-tooth carbide blade (60–80 teeth); thin hardboard flexes, so support it fully or cut it with a utility knife and straightedge. Measure your blade's kerf and enter it in the optimizer — see saw kerf explained — and follow the cut sequence from how to break down a sheet of plywood.
FAQ
How much does a sheet of hardboard weigh?
A 1/4 in 4×8 sheet weighs roughly 37–43 lb (17–20 kg), based on a typical density of 55–65 lb/ft³. Check the supplier's data for your exact product.
Does hardboard have a grain direction?
No. Hardboard is uniform in every direction, so parts can be rotated freely — which usually improves yield.
What blade should I use to cut hardboard?
Fine-tooth carbide blade (60–80 teeth); thin hardboard flexes, so support it fully or cut it with a utility knife and straightedge.