Flagstone is usually sold by the ton or by the pallet, and how far it goes depends mostly on how thick the stone is. For patio flagstone, one ton covers roughly 80 to 120 square feet. Thinner patio-gauge stone covers toward the high end, thicker standup stone toward the low end. Measure your area, plan your joint spacing, and add about 10 percent for cuts and breakage. Thickness is the variable that moves your tonnage the most, so it is worth deciding on a stone before you order. Browse flagstone by color and thickness to settle that first.
Thickness changes everything
Two flagstone patios of the same size can need noticeably different tonnage based on stone thickness:
- Patio gauge: thinner stone meant for a finished patio surface set over a base. It is lighter per square foot, so a ton covers more area, toward the 120 square foot end.
- Standup stone: thicker, heavier stone used where you want more durability or a chunkier look. Because it weighs more per square foot, a ton covers less area, toward the 80 square foot end.
If you are unsure which gauge a project calls for, our walkthrough on how to build a flagstone patio covers the base and setting steps that go with each.
The simple method
- Measure the area. Length times width in feet gives square footage. Break irregular patios into rectangles and add them up.
- Plan your joints. Flagstone is laid with gaps between stones, which you fill later with sand or a planting mix. Wider joints mean fewer stones cover the same footprint, so a relaxed, wide-joint layout stretches your material a little further than tight joints.
- Convert to tons. Divide your square footage by the coverage range for your thickness: about 80 square feet per ton for thick stone, up to about 120 for thin patio stone.
- Add for cuts and breakage. Flagstone gets cut to fit and the occasional piece breaks, so add about 10 percent on top of your calculated tonnage.
A worked example
Imagine a front-entry patio, 10 feet by 10 feet, laid in patio-gauge flagstone with normal joints.
- Area: 10 times 10 equals 100 square feet.
- Coverage: patio-gauge stone at about 110 square feet per ton, so 100 divided by 110 is a little under 1 ton.
- Cuts and breakage: add about 10 percent, which brings it back up to right around 1 ton.
If you went with thicker standup stone instead, at roughly 90 square feet per ton, the same 100 square foot patio would need closer to 1.1 tons before the breakage allowance. The coverage calculator works out the exact figure for your area once you know the thickness you are buying.
Pick the stone
Colour and thickness are chosen together, since most of these come in several cuts from thin patio gauge up to standup. That cut choice is what sets your coverage figure.
Shop flagstone
Arizona Buff Flagstone
Bluestone Blue Flagstone
Arizona Sedona Flagstone
Arizona Chocolate Flagstone
Arizona Peach Flagstone
Autumn Gold Flagstone
Arizona Classic Oak Flagstone
Arizona Mixed Colors Flagstone
Arizona Champagne Flagstone
Arizona Pueblo Flagstone
There are 61 flagstones in the full collection.
Do not forget the base and the joints
The stone itself is only part of the order. A flagstone patio is a layered build, and the material under the stone is usually a bigger volume than the stone on top. For a typical dry-laid patio, plan on roughly 4 inches of compacted base and 1 inch of bedding sand beneath the flagstone.
| Layer | Typical depth | Material |
|---|---|---|
| Compacted base | 4 inches | Class II road base |
| Bedding course | 1 inch | Bedding sand |
| Flagstone | 1 to 2 inches | Flagstone |
| Joint fill | full joint depth | Sand, decomposed granite, or pea gravel |
Shop the layers underneath
Class II Road Base, the compacted base
Sakrete Polymeric Sand, for locking joints
Del Rio Pea Gravel, for wide joints
California Gold D.G., for a firm natural joint
As a rule of thumb, a 100 square foot patio needs about 1.2 cubic yards of base gravel and about 0.3 cubic yards of bedding sand on top of the flagstone tonnage. Our guides on how much sand do I need and types of sand for landscaping cover which sand belongs in the bedding course versus the joints, and cubic yards vs tons explains converting between the units these layers are sold in.
Flagstone or steppers
For a full patio surface, flagstone laid tight is the usual choice. If you only want a stepping path across a lawn or bed, you do not need full coverage. Individual steppers set with planted gaps use far less stone, and you size them by counting steps rather than covering an area.
If you have not committed to flagstone at all yet, flagstone vs pavers weighs the two against each other and pavers shows the alternative. For the surrounding path or ground cover rather than the patio itself, see the best landscape rock for a patio and the best landscape rock for walking paths.
Using flagstone vertically
Flat stone also goes into low walls, step risers, and veneer, and the math is different there because you are covering a vertical face rather than a floor. You size those by face square footage, and the stone is usually a different product line. See how to choose wall rock and building stone, then compare wall rock and ledgestone.
Flagstone colour varies piece to piece within the same quarry run, more than gravel does. Order a sample and expect the pallet to show a range around it rather than an exact match.
Frequently asked questions
How many square feet does a ton of flagstone cover?
For patio flagstone, roughly 80 to 120 square feet per ton. Thinner patio-gauge stone covers toward the high end; thicker standup stone is heavier per square foot and covers toward the low end.
Is flagstone sold by the ton or the pallet?
Both are common. Flagstone is usually sold by the ton or by the pallet. Either way, you size the order from your patio square footage and the stone thickness.
How much extra flagstone should I order?
Add about 10 percent over your calculated tonnage for cuts and breakage. Flagstone gets trimmed to fit and the odd piece breaks, so the extra keeps you from running short mid-project.
Does joint spacing change how much I need?
Yes. Wider joints between stones mean fewer stones cover the same footprint, which stretches your material slightly. Tight joints use a little more stone per square foot.
What is the difference between patio and standup flagstone?
Patio gauge is thinner stone for a finished patio surface, so a ton covers more area. Standup stone is thicker and heavier for durability or a chunkier look, so a ton covers less area.
How much base goes under a flagstone patio?
Plan on about 4 inches of compacted crushed base plus 1 inch of bedding sand. For a 100 square foot patio that is roughly 1.2 cubic yards of base gravel and about 0.3 cubic yards of sand, on top of the flagstone itself.
How many pieces of flagstone are in a ton?
It varies with thickness and piece size, so count on the coverage figure rather than a piece count. A ton of patio-gauge stone covering about 110 square feet might be 15 to 30 pieces, while thicker standup stone gives you fewer, heavier pieces over less area.
What should I fill flagstone joints with?
Sand is the standard for a clean, swept joint. Decomposed granite gives a firmer, more natural-looking fill that holds better on slopes, and pea gravel suits wide, informal joints. For planted joints, use a soil mix instead so the plants can root.
Get the materials
Browse flagstone for full patios or steppers for a stepping path, add base gravel and bedding sand for the layers underneath, then size the job with the coverage calculator. For pallet quantities or long-distance delivery, request a quote and we will work out freight. We deliver nationwide from our California yards.