Stone calculator
Stone Slab Weight Calculator
Feet and inches in, pounds and kilograms out — for any slab material and thickness.
Your project
Weight per slab
550
lb
- Slab area
- 32 sq ft
- Weight per square foot
- 17.2 lb
- Kilograms per slab
- 249
- Total (1 slabs)
- 550 lb
- Total tons
- 0.28
Transport slabs vertically in an A-frame. A slab laid flat on a trailer will crack over the first pothole.
The shareable link reopens this calculator with your exact inputs.
Slab weight per square foot
The quickest route is weight per square foot: density × thickness in feet. For granite at 165 lb/ft³, that gives 13.8 lb/sq ft per inch of thickness. Multiply by the slab area and you have the answer.
Common results: 1 inch granite 13.8 lb/sq ft, 1.25 inch (3 cm) 17.2, 2 inch 27.5, 3 inch 41.3.
Getting it on site safely
Rate every lift by weight per person: 50 lb sustained is a reasonable working limit, 100 lb is a short two-person carry, anything above 400 lb needs mechanical help. Slab edges chip if they touch concrete, so carry on foam or timber battens.
Weight per square foot by material and thickness
| Material | 1" | 1.25" (3 cm) | 2" |
|---|---|---|---|
| Granite | 13.8 lb | 17.2 lb | 27.5 lb |
| Marble | 14.2 lb | 17.7 lb | 28.3 lb |
| Limestone | 13.3 lb | 16.7 lb | 26.7 lb |
| Sandstone | 12.5 lb | 15.6 lb | 25 lb |
| Slate | 14.6 lb | 18.2 lb | 29.2 lb |
| Bluestone | 13.8 lb | 17.2 lb | 27.5 lb |
Frequently asked questions
+How much does a stone slab weigh?
An 8 ft × 4 ft granite slab at 1.25 inches weighs about 550 lb. Weight scales directly with area and thickness.
+How do I work out weight per square foot?
Multiply the density in lb/ft³ by the thickness in feet. Granite at 165 lb/ft³ and 2 inches gives 165 × 0.1667 = 27.5 lb/sq ft.
+Can two people carry a stone slab?
Up to roughly 200 lb with suction cups and clear footing. Beyond that use a third person, a slab dolly or a machine.
+Which stone is heaviest?
Slate at about 175 lb/ft³, followed by marble at 170 and granite at 165. Travertine is the lightest common slab stone at around 145.