Soil for a 4x8 Raised Bed 12 Inches Deep
How much soil for a 4x8 raised bed 12 inches deep: 32.0 cubic feet, which is 1.19 cubic yards, 16 bags of 2 cubic feet or 22 bags of 1.5 cubic feet.
Volume and tonnage calculator →The math
- Volume: 4 × 8 × (12 ÷ 12) = 32.0 cu ft.
- Cubic yards: 32.0 ÷ 27 = 1.19 yd³.
- Bags: 32.0 ÷ 2 = 16 bags (2 cu ft), or ÷ 1.5 = 22 bags (1.5 cu ft).
The topsoil calculator handles any bed size.
Related: Soil for a 4x8 Raised Bed 6 Inches Deep
Soil for a 4x8 bed at other depths
| Depth | Cubic feet | Cubic yards | 2 cu ft bags |
|---|---|---|---|
| 6 in | 16.0 | 0.59 | 8 |
| 8 in | 21.3 | 0.79 | 11 |
| 10 in | 26.7 | 0.99 | 14 |
| 12 in | 32.0 | 1.19 | 16 |
| 18 in | 48.0 | 1.78 | 24 |
| 24 in | 64.0 | 2.37 | 32 |
Bags or bulk?
Bulk soil is usually cheaper per cubic yard than bags once you pass roughly 1 yard. At 1.19 yards, bulk delivery is likely the better deal. Fill several beds at once to make a delivery worthwhile.
Related: Soil for a 4x8 Raised Bed 8 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
New soil settles, often by 10 to 20 percent in the first season. Overfill slightly or plan to top up with compost next spring. Line the bottom with cardboard to smother grass instead of digging it out.
Delivery and spreading
Ask the supplier where the truck can safely dump without crossing soft lawn or septic fields. Cover the pile if rain is coming. Spread with a flat shovel and a landscape rake, working from the far end back toward the pile.
Timing the job
Plan deliveries for a dry stretch so the pile and the ground are workable. Early spring mulching suppresses weeds before they sprout, while fall soil work gives beds time to settle before planting.
Questions people ask
How many bags of soil for a 4x8 raised bed?
About 16 bags of 2 cubic feet at 12 inches deep.
How many cubic feet in a 4x8x12 inch bed?
32.0 cubic feet.
How many yards of soil for a 4x8 raised bed?
About 1.19 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 10 Inches Deep
- Soil for a 4x8 Raised Bed 11 Inches Deep
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