How Much Gravel for a 12x12 Greenhouse Floor?
How much gravel for a 12x12 greenhouse floor: about 1.9 tons at 3 inches deep. The area is 144 square feet, which is 1.33 cubic yards at that depth.
Volume and tonnage calculator →The math
- Area: 144.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 144.0 × 0.250 ÷ 27 = 1.33 yd³.
- Tons: × about 1.4 tons per yard = 1.9 tons.
The gravel calculator does this for any size.
Related: How Much Crushed Stone for a 12x12 Greenhouse Floor?
Gravel needed by depth
| Depth | Cubic yards | Tons of gravel | Tons +10% |
|---|---|---|---|
| 2 in | 0.89 | 1.2 | 1.4 |
| 3 in | 1.33 | 1.9 | 2.1 |
| 4 in | 1.78 | 2.5 | 2.7 |
| 6 in | 2.67 | 3.7 | 4.1 |
Stone for a greenhouse
A stone floor drains spilled water, holds some heat and is easy to rake clean. Many growers use about 3 inches of pea gravel or washed stone over fabric, with paver or concrete stepping paths if they roll carts.
Related: How Much #57 Stone for a 12x12 Greenhouse Floor?
Before the stone goes in
Remove sod and roots, level the area and slope it slightly for drainage. Install edging so the stone stays inside the footprint.
Ordering and delivery
Most quarries and landscape yards deliver by the ton; ask whether there is a minimum and a delivery fee, and where the driver can dump without damaging your lawn. Gravel is a broad label, so confirm whether the yard means crushed or rounded stone and whether it carries fines. Ask your supplier for their own tons-per-yard number, since stone source and moisture change it.
Measuring the area
Measure length and width in feet at a few points and use the largest figures, since real sites are rarely square. For odd shapes, split the area into rectangles and circles, work out each one and add them together. Depth is the number most people underestimate: drive a stake, run a level string and measure down to the dug-out surface in several spots.
Common mistakes
People often forget that compaction reduces volume, so they come up short. Others order clean, round stone where a packable crushed stone with fines would have stayed put. Finally, dumping the whole load in one pile far from the work area adds hours of wheelbarrow trips.
Questions people ask
How many tons of gravel for a 12x12 greenhouse floor?
About 1.9 tons at 3 inches deep.
How many yards of gravel for a 12x12 greenhouse floor?
About 1.33 cubic yards.
How many tons of gravel are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Should I put landscape fabric under the stone?
On soft or clay soil, a woven geotextile keeps stone from sinking into the dirt and makes the layer last longer.
Related guides
- Gravel for a Greenhouse Floor: Best Stone, Depth and Tons
- How Much Does a Ton of Gravel Cover? Depth Chart
- Tons to Cubic Yards for Gravel: Conversion Chart
- Crushed Stone vs Gravel: Differences and Best Uses
- Geotextile Fabric for Driveways: Woven vs Nonwoven and How Much You Need
- Compacting a Driveway Gravel Base in Lifts
- How Much #57 Stone for a 10x16 Greenhouse Floor?
- How Much Pea Gravel for a 12x12 Greenhouse Floor?
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