Estimating stone isn't complicated, but a couple of small mistakes — forgetting waste, or confusing coverage between thicknesses — are what send people back for a second order. And a second order is the one thing to avoid, because stone is a natural material and lots vary. A top-up batch from a later quarry run can read noticeably different in the finished patio.
Get it right the first time with three numbers.
Step one — measure the square footage.
Length × width, in feet. For an irregular shape, break it into rectangles, measure each, and add them up. Round generously — it's the floor of your estimate, not the ceiling.
Step two — add a waste factor.
Every project loses material to cuts, breakage, and the simple fact that natural stone doesn't tessellate perfectly. Add 10% for a simple square pattern, 15% for irregular flagstone and lots of curves, and up to 20% for complex shapes, diagonals, or intricate borders. So a 400 sq ft irregular patio means ordering for roughly 460.
Waste isn't money wasted. The offcuts fill edges and corners, and a small surplus protects you against a future repair that would otherwise never match.
Step three — know your coverage by thickness.
Here's where people slip. Stone is often sold by the ton as well as the square foot, and coverage per ton drops as thickness rises — thicker stone simply weighs more per square foot. As a rough guide for flagstone:
| Thickness | Approx. coverage per ton | Per pallet |
|---|---|---|
| 1″ | ~120–150 sq ft | ~240 sq ft |
| 1.5″ | ~90–110 sq ft | ~160 sq ft |
| 2″ | ~70–90 sq ft | ~120 sq ft |
Enter your dimensions — the calculator applies the same three steps above: area, then waste, then coverage by thickness.
A planning estimate — natural stone varies by lot, so confirm before ordering. Send us your square footage and we'll do the math with you.
Putting it together.
A 400 sq ft patio in 1.5″ irregular bluestone: 400 × 1.15 waste = 460 sq ft to order. At roughly 100 sq ft per ton, that's about 4.5–5 tons. Now you know what to ask for — and roughly what it'll cost once you bring in our DFW pricing ranges.
The single best way to control freight is to order completely the first time — one full load beats a second truck for a small top-up.
Not sure which thickness you should be using? Start with how thick bluestone should be on a patio. And when you're ready, send us your square footage — we'll do the math with you and make sure the order arrives complete.