Slab Yield Calculator
Estimate how many slabs a countertop job needs, your usable square footage, yield %, and waste — in seconds.
Slab & Cut Settings
Ballpark 80–90% for most jobs — folds in saw kerf, factory-edge trim, defects, and offcut a real layout leaves behind.
Job Material Needed
Finished sqft of all tops, islands, backsplashes, and waterfalls for this job.
2
Slabs needed (est.)
50%
Est. yield
46.9
Usable sqft / slab
55.3
Est. waste sqft
Gross slab area: 55.1 sqftJob needs: 55.0 sqftTotal stone purchased: 110.3 sqft
Estimate only. Slab count is rounded up because you can't buy a partial slab. True yield depends on how the actual pieces nest on the stone — their shapes, grain direction, and seam placement. This calculator assumes pieces pack into the usable area without per-piece offcut loss, so real-world yield is usually lower.
How this calculator works
1.Gross slab area = width × height ÷ 144, converted from square inches to square feet.
2.Usable area = gross slab area × your usable-yield factor, which discounts saw kerf, edge trim, defects, and offcut.
3.Slabs needed = job square footage ÷ usable area per slab, rounded up — you can't buy two-thirds of a slab.
4.Yield % = job sqft ÷ (slabs × gross slab area). Waste = total stone purchased − job sqft.