Soil for a 4x12 Raised Bed 12 Inches Deep
How much soil for a 4x12 raised bed 12 inches deep: 48.0 cubic feet, which is 1.78 cubic yards, 24 bags of 2 cubic feet or 32 bags of 1.5 cubic feet.
Volume and tonnage calculator →The math
- Volume: 4 × 12 × (12 ÷ 12) = 48.0 cu ft.
- Cubic yards: 48.0 ÷ 27 = 1.78 yd³.
- Bags: 48.0 ÷ 2 = 24 bags (2 cu ft), or ÷ 1.5 = 32 bags (1.5 cu ft).
The topsoil calculator handles any bed size.
Related: Soil for a 4x12 Raised Bed 18 Inches Deep
Soil for a 4x12 bed at other depths
| Depth | Cubic feet | Cubic yards | 2 cu ft bags |
|---|---|---|---|
| 6 in | 24.0 | 0.89 | 12 |
| 8 in | 32.0 | 1.19 | 16 |
| 10 in | 40.0 | 1.48 | 20 |
| 12 in | 48.0 | 1.78 | 24 |
| 18 in | 72.0 | 2.67 | 36 |
| 24 in | 96.0 | 3.56 | 48 |
When bulk soil pays off
Bulk soil is usually cheaper per cubic yard than bags once you pass roughly 1 yard. At 1.78 yards, bulk delivery is likely the better deal. Fill several beds at once to make a delivery worthwhile.
Related: Soil for a 5x10 Raised Bed 12 Inches Deep
What to fill it with
Many gardeners blend topsoil with compost, around 50 to 60 percent topsoil. The compost adds nutrients and keeps the mix loose. Bagged potting soil alone is light and can dry out fast in a deep bed.
Settling
Expect the bed to sink a few inches as the soil settles and organic matter breaks down. Mound it a little at first and water it in before planting. In very deep beds, the bottom few inches can be coarse material, since most vegetable roots work the top 12 inches.
Common mistakes
Many people underestimate settling, so beds end up low by the second season. Others pile soil or mulch against tree trunks and siding, which invites rot and insects. Wet, sticky soil should wait for a drier day before spreading.
Checking quality
Good bulk soil is dark, crumbly and free of trash, large rocks and weed roots. Ask whether it is screened and whether compost is blended in. If possible, look at the pile before ordering or ask for a sample.
Questions people ask
How many bags of soil for a 4x12 raised bed?
About 24 bags of 2 cubic feet at 12 inches deep.
How many cubic feet in a 4x12x12 inch bed?
48.0 cubic feet.
How many yards of soil for a 4x12 raised bed?
About 1.78 cubic yards at 12 inches deep.
What soil mix is best for raised beds?
Topsoil blended with compost, roughly 60/40, is a common starting point.
Will raised bed soil settle?
Yes, often 10 to 20 percent in the first season.
Related guides
- How Much Does a Yard of Topsoil Cover?
- How Many Bags of Topsoil in a Yard? Size Chart
- Fill Dirt vs Topsoil: Differences, Uses and Tons to Order
- How Much Does a Yard of Dirt Weigh? Topsoil, Fill, Clay
- Soil for a 4x8 Raised Bed 24 Inches Deep
- Soil for a 4x10 Raised Bed 12 Inches Deep
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