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Tons of flagstone for a patio or path by thickness, plus the gravel base and sand setting bed underneath.
With these inputs:
| Result | Value |
|---|---|
| Flagstone to order | 1.8–2.2 tons |
| Area incl. waste | 220 sq ft |
| Crusher run base (4 in) | 2.47 yd³ (3.7 tons) |
| Sand bed (1 in) | 0.62 yd³ (0.83 tons) |
| Patio area | 200 sq ft |
| Coverage per ton | 100–120 sq ft |
| Waste allowance | 10% |
| Base density | 1.5 tons per yd³ |
| Sand density | 1.35 tons per yd³ |
Coverage rates are supplier ranges for natural flagstone, which varies in thickness piece to piece — ask your yard for its figure for the stone you pick. The base and sand are measured over the patio area without the waste allowance; add edging to stop the base spreading.
Flagstone is sold by the ton, and how far a ton goes depends on how thick the stone is: thin patio stone covers roughly twice the area of thick slabs. Enter the patio size, the thickness you are buying and a waste allowance for the tons of flagstone, plus the crushed stone base and sand bed a dry-laid patio sits on.
It depends on thickness. Ironside Stone Works quotes roughly 150–180 sq ft per ton for thin ½–1 in stone, 100–120 sq ft for 1–2 in patio stone, and 75–100 sq ft for 2–3 in slabs. Select Stone Supply puts 2 inch flagstone at about 80 sq ft per ton.
200 sq ft plus 10% waste is 220 sq ft. At 100–120 sq ft per ton for 1–2 in patio stone that is 1.8 to 2.2 tons. Under it, a 4 inch crusher run base is 2.47 cubic yards (3.7 tons) and a 1 inch sand bed is 0.62 cubic yards (0.83 tons).
At least 10%, and up to 25% for irregular stone or tight joints — the range suppliers such as Ironside Stone Works recommend. Irregular pieces rarely fit without trimming, and it is hard to match a second delivery.
For a dry-laid patio, a compacted crushed stone base such as crusher run and a thin sand or stone-dust bed to seat each piece. The depths are inputs above; the paver base calculator covers the same layers for pavers.
Most stone yards sell natural flagstone by the ton or by the pallet, because each piece is a different size. Convert your patio area to tons with the supplier's coverage rate, then round up to their pallet size.
Need the whole roof at once? The free roofing calculator works out roof area, squares, shingle bundles, underlayment, drip edge, ridge cap and installed cost from one set of measurements.