Tool
Natural stone weight calculator
Work out the weight of marble, quartzite, granite or onyx slabs and blocks, how many pieces fit in a container by weight and how many slabs you need for an area. Results are approximate.
How much does a marble slab weigh?
Weight is volume multiplied by the density of the stone: weight (kg) = length (m) × width (m) × thickness (m) × density (kg/m³). Most marbles, quartzites and granites have a density of about 2,600–2,800 kg/m³ (roughly 162–175 lb/ft³).
| Piece (2,700 kg/m³) | Size | Approx. weight |
|---|---|---|
| 1 m² of 2 cm slab | 1 × 1 × 0.02 m | 54 kg (about 11 lb/ft²) |
| 1 m² of 3 cm slab | 1 × 1 × 0.03 m | 81 kg (about 17 lb/ft²) |
| 2 cm slab | 3.00 × 1.90 m (118 × 75 in) | about 308 kg (680 lb) |
| 3 cm slab | 3.00 × 1.90 m (118 × 75 in) | about 462 kg (1,020 lb) |
| Block | 3.0 × 1.9 × 1.7 m | about 26 t |
Slabs don't come in one fixed size: it depends on the block they are cut from. It's best to calculate with the real size of each slab, which we send you along with its photos.
Why weight matters
- Shipping: stone fills a container by weight long before it fills it by volume, which is why 20-foot containers are the norm.
- Handling: a large 3 cm slab weighs close to half a tonne and is moved upright with clamps, vacuum lifters or A-frames.
- Construction: weight per m² is used to check the load on floors, walls and cladding anchors. The project engineer always signs this off.
If you buy blocks, see our guide to marble quarry blocks. To order slabs or blocks with their real sizes, get in touch.