Stone calculator
How many slabs from a block
Enter the block, the slab thickness and the saw kerf: you see the slabs, the m² and what the saw takes.
The width is the side the saw cuts across; each slab is length × height.
Sawn slab thickness
As the slab leaves the saw, before calibrating and polishing.
About 4 to 8 mm for multi-wire and gang saws, under 1 mm for thin wire. It depends on your saw.
Slabs
70
Each 5.40 m²
Slab area, gross
378.0m²
4,069 ft²
m² per m³
36.8m²/m³
Lost to the saw
25.4%
Left over: 1.7 cm
See it with your own blocks and slabs.
Book a demoHow it's calculated
n × thickness + (n − 1) × kerf ≤ the width cut across
The saw cuts across the block's width. Each slab takes its thickness, and each cut between two slabs takes one kerf. The slab area is length × height, gross, before the edges are trimmed.
Example
A 3.0 × 1.8 × 1.9 m block, 2 cm slabs, 7 mm kerf: (1,900 + 7) ÷ (20 + 7) = 70.6, so 70 slabs. 70 × 3.0 × 1.8 = 378 m², or 36.8 m² per m³. The 69 cuts take 48.3 cm of stone, a quarter of the block.
Slabs by thickness
For the example block (3.0 × 1.8 × 1.9 m, cut across the 1.9 m) with a 7 mm kerf. Gross area, before trimming and breakage.
| Thickness | Slabs | m² per m³ | Lost to the saw |
|---|---|---|---|
| 1.2 cm | 100 | 52.6 | 36% |
| 1.5 cm | 86 | 45.3 | 31% |
| 2 cm | 70 | 36.8 | 25% |
| 3 cm | 51 | 26.8 | 18% |
| 4 cm | 40 | 21.1 | 14% |
| 3/4″ | 73 | 38.4 | 27% |
| 1 1/4″ | 49 | 25.8 | 18% |
Sources
- Breton: Paragon multiwire · diamond wires of 5.3–7.3 mm; the cut is a little wider than the wire
- Litos: Survey, multi-wire machines · diamond wires of 6.3 and 7.3 mm; the cut is a little wider than the wire
Slab sizes: quartz, granite and marble
Engineered quartz comes in its maker's fixed sizes. A natural stone slab is as long and as high as its block, so every bundle differs: the natural stone rows give the median of the 292 slabs a New York stone supplier listed in October 2026.
| Slab | Standard size | Jumbo or longest | Thickness |
|---|---|---|---|
| Engineered quartz (Caesarstone) | 305 × 144 cm (120 × 56.5 in) | 334 × 164 cm (131.5 × 64.5 in) | 1.2 · 2 · 3 cm |
| Engineered quartz (Silestone) | 306 × 140 cm (120.5 × 55.1 in) | 325 × 159 cm (128 × 62.6 in) | 1.2 · 2 · 3 cm |
| Granite | median 300 × 180 cm (118 × 71 in) | up to 338 cm (133 in) long | 2 · 3 cm |
| Marble | median 297 × 175 cm (117 × 69 in) | up to 348 cm (137 in) long | 2 · 3 cm |
| Quartzite | median 323 × 196 cm (127 × 77 in) | up to 351 cm (138 in) long | 2 · 3 cm |
Sources
- Caesarstone US: Countertops · Engineered quartz (Caesarstone)
- Cosentino NZ: Silestone Polished · Engineered quartz (Silestone)
- Superior Selected Stone: Stone Slab Size · granite, marble, and quartzite
With Noria Strata, every block keeps its slabs: how many came off the saw, their m² and where each one is now.
Book a demoQuestions
Add one kerf to the block's width, divide by the slab thickness plus one kerf, and round down. With a 7 mm kerf, a block 1.9 m wide gives 70 slabs of 2 cm or 51 slabs of 3 cm.
About 1 ÷ (thickness + kerf). With a 7 mm kerf that is about 37 m² per m³ at 2 cm and 27 m² per m³ at 3 cm. This is gross area, before the edges are trimmed and before any breakage.
The width of stone the saw turns into slurry at each cut. Beaded multi-wire saws and gang saws cut about 4 to 8 mm, thin diamond wire less than 1 mm. Your saw supplier can give you the figure for your saw.
Yes, but the kerf stays the same, so the saw takes a bigger share. With a 7 mm kerf, 1.2 cm slabs give about 53 m² per m³ and lose 36% to the saw; 3 cm slabs give about 27 m² per m³ and lose 18%.
