# Stone Weight Calculator

Mass per square metre and total for stone slabs by density.

- Page: https://jianzhujisuan.com/en/stone-weight
- Category: Material weights (https://jianzhujisuan.com/en/c/material-weight)
- Chinese version: https://jianzhujisuan.com/zh/stone-weight.md
- Data checked: 2026-10-25

## Quick result

With the default inputs (Length 600 mm, Width 300 mm, Thickness 20 mm, Quantity 50 pcs, Density 2.7 g/cm³): **Total mass 486.00 kg**

## Inputs

| Parameter | Type | Default | Unit | Note |
|---|---|---|---|---|
| Length | number | 600 | mm |  |
| Width | number | 300 | mm |  |
| Thickness | number | 20 | mm | Flooring 18-20, dry-hung 25-30 |
| Quantity | number | 50 | pcs |  |
| Density | number | 2.7 | g/cm³ | Granite 2.7-2.8, marble 2.6-2.8, engineered 2.3-2.5 |

## Formula

- **Area**: A = length × width in metres
- **Volume**: V = A × thickness in metres
- **Mass per piece**: V × density × 1000
- **Mass per m²**: thickness (mm) × density
- **Total**: per piece × quantity
- **Truck load**: area = payload × 1000 ÷ mass per m²

## Worked example

Fifty 600 × 300 × 20 mm granite pieces: 0.180 m², 0.0036 m³ and 9.72 kg each — 9.000 m² and 486.00 kg in total, about 103 pieces to the tonne.

## Questions

### Why do stone deliveries keep overloading?

Because loading by volume badly overshoots on weight. Granite 30 mm is 81 kg/m², so a 30 t truck takes 370 m² of slab; load 400 m² by eye and you are 2.4 t over. Always plan by payload: 370 m² of 30 mm is the ceiling on a 30 t truck.

### How does thickness differ between wet-fix and dry-hung?

Wet fixing on cement mortar uses 18-20 mm and relies on full-bed adhesion; dry hanging uses 25-30 mm carried by stainless brackets and framing, with slots or holes cut in the slab. Dry-hung stone under 25 mm cracks at the slot, and wet-fixed stone over 25 mm is heavy enough to debond as the mortar shrinks — wet fixing is barred on tall facades.

### How much heavier is granite than marble?

Three to eight percent. Granite runs 2.7-2.8, marble 2.6-2.8, sandstone only 2.2-2.4 and engineered stone 2.3-2.5. At 20 mm that is 54 kg/m² for granite, 53 for marble and 46 for sandstone. Outdoors must be granite — marble weathers badly and acid rain dulls and yellows it.

## Related tools

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- [Steel Plate Weight Calculator](https://jianzhujisuan.com/en/steel-plate-weight): Mass per square metre, per plate and in total from size and thickness.
- [Round, Square and Flat Bar Weight Calculator](https://jianzhujisuan.com/en/steel-bar-weight): Mass per metre and total for round, square and flat bar.
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- [Aluminium Plate Weight Calculator](https://jianzhujisuan.com/en/aluminum-weight): Mass per square metre, per plate and in total for aluminium.

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