Fire Pit Gravel Calculator
Gravel needed for a ring around a fire pit. Yards, tons and bags by outer diameter, assuming a 3 ft pit and 3-inch depth.
This covers the gravel ring around a fire pit — the area between the pit (about 3 ft across) and the outer edge of the gravel circle, at a 3-inch depth.
Pea gravel at 3 in deep · density ≈ 1.45 tons/yd³ · 0.5 ft³ bags.
| Outer diameter 3 ft pit | Cubic yards | Tons (est.) | 0.5 ft³ bags |
|---|---|---|---|
| 6 ft | 0.20 | 0.28 | 11 |
| 8 ft | 0.40 | 0.58 | 22 |
| 10 ft | 0.66 | 0.96 | 36 |
| 12 ft | 0.98 | 1.42 | 54 |
| 15 ft | 1.57 | 2.28 | 85 |
Tonnage is an estimate from loose, dry bulk density; damp or compacted material weighs more. Order ~5–10% extra for settling.
A gravel ring around a fire pit serves two purposes: it creates a clean, non-combustible surface for seating and keeps grass and organic debris away from the heat. Pea gravel is the most popular choice for its smooth look, though crushed stone or river rock also work well.
Three inches of depth is standard — deep enough to stay in place and suppress weeds, but not so deep that chairs sink in. The amounts in the table are the ring only (outer area minus the pit area). If you plan to gravel the entire patio, use the circle option on the main calculator with just the outer diameter.
Frequently asked questions
What type of gravel is best around a fire pit?
Pea gravel and river rock are the most popular choices — they look attractive, drain well, and stay reasonably in place. Avoid limestone or other porous rocks that can absorb moisture; when heated, they can pop or even crack. Lava rock is also a popular, lightweight option.
How much gravel do I need for a 10 ft circle around a 3 ft fire pit?
A 10 ft outer diameter ring around a 3 ft pit at 3 inches deep needs about 0.58 cubic yards of gravel — roughly one scoop of bulk delivery. The table shows this in the 10 ft row.
Do I need landscape fabric under fire pit gravel?
Yes — a layer of landscape fabric or weed barrier under the gravel will prevent weeds from growing through and keep the stone layer cleaner over time. Cut it to the ring shape and overlap the edges by a few inches.