Soil for a 4x8 Raised Bed 6 Inches Deep
How much soil for a 4x8 raised bed 6 inches deep: 16.0 cubic feet, which is 0.59 cubic yards, 8 bags of 2 cubic feet or 11 bags of 1.5 cubic feet.
Volume and tonnage calculator →The math
- Volume: 4 × 8 × (6 ÷ 12) = 16.0 cu ft.
- Cubic yards: 16.0 ÷ 27 = 0.59 yd³.
- Bags: 16.0 ÷ 2 = 8 bags (2 cu ft), or ÷ 1.5 = 11 bags (1.5 cu ft).
The topsoil calculator handles any bed size.
Related: Soil for a 4x8 Raised Bed 8 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 0.59 yards, bags are simpler. Fill several beds at once to make a delivery worthwhile.
Related: Soil for a 4x8 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
Buying by the bag for a large area is the classic error: dozens of bags cost far more than a bulk yard. Another is skipping compost or using unscreened soil full of clods and roots. Spreading soil when it is soaking wet compacts it and makes it hard for roots and water to move.
Measuring accurately
Walk the area with a tape and sketch it. Break odd shapes into rectangles and circles. If you are topping up an existing bed or lawn, measure only the new depth, since adding a full depth on top of existing soil overbuys.
Questions people ask
How many bags of soil for a 4x8 raised bed?
About 8 bags of 2 cubic feet at 6 inches deep.
How many cubic feet in a 4x8x6 inch bed?
16.0 cubic feet.
How many yards of soil for a 4x8 raised bed?
About 0.59 cubic yards at 6 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 4x4 Raised Bed 18 Inches Deep
- Soil for a 4x6 Raised Bed 12 Inches Deep
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