How Much Gravel for a 12x16 Greenhouse Floor?
A 12 by 16 foot greenhouse covers 192 square feet. At 3 inches of gravel, plan on 1.78 cubic yards, or about 2.5 tons, which answers how much gravel for a 12x16 greenhouse floor.
Volume and tonnage calculator →The math
- Area: 192.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 192.0 × 0.250 ÷ 27 = 1.78 yd³.
- Tons: × about 1.4 tons per yard = 2.5 tons.
The gravel calculator does this for any size.
Related: How Much Crushed Stone for a 12x16 Greenhouse Floor?
Gravel needed by depth
| Depth | Cubic yards | Tons of gravel | Tons +10% |
|---|---|---|---|
| 2 in | 1.19 | 1.7 | 1.8 |
| 3 in | 1.78 | 2.5 | 2.7 |
| 4 in | 2.37 | 3.3 | 3.7 |
| 6 in | 3.56 | 5.0 | 5.5 |
Stone for a greenhouse
Greenhouse floors need to drain. A few inches of washed stone over landscape fabric keeps roots and weeds down and dries quickly after watering. Avoid stone with a lot of fines, which can turn muddy.
Related: How Much #57 Stone for a 12x16 Greenhouse Floor?
Prep
Remove sod and roots, level the area and slope it slightly for drainage. Install edging so the stone stays inside the footprint.
Buying the stone
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.
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.
Measuring the area
Use a long tape and measure each side twice. If the ground slopes, measure depth at the high and low ends and average them. Irregular outlines can be broken into simple rectangles, triangles and circles; add the pieces for the total square footage before converting to tons.
Questions people ask
How many tons of gravel for a 12x16 greenhouse floor?
About 2.5 tons at 3 inches deep.
How many yards of gravel for a 12x16 greenhouse floor?
About 1.78 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.
Do I need to compact it?
Yes for anything that carries weight. Compact in lifts of a few inches with a plate compactor.
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 12x12 Greenhouse Floor?
- How Much Pea Gravel for a 12x16 Greenhouse Floor?
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