Soil for a 4 × 12 ft bed at each depth
Whole bags are rounded up. The bed’s wall height is not the soil depth: measure the depth you plan to fill.
| Soil depth | Cubic feet | Cubic yards | Bags of ¾ ft³ | Bags of 1 ft³ | Bags of 1.5 ft³ | Bags of 2 ft³ | Bags of 3 ft³ |
|---|---|---|---|---|---|---|---|
| 6 in | 24 | 0.89 | 32 | 24 | 16 | 12 | 8 |
| 8 in | 32 | 1.19 | 43 | 32 | 22 | 16 | 11 |
| 10 in | 40 | 1.48 | 54 | 40 | 27 | 20 | 14 |
| 12 in | 48 | 1.78 | 64 | 48 | 32 | 24 | 16 |
| 18 in | 72 | 2.67 | 96 | 72 | 48 | 36 | 24 |
| 24 in | 96 | 3.56 | 128 | 96 | 64 | 48 | 32 |
Measure inside the walls
The table uses the full 4 × 12 ft. If that is the outside size of a wooden bed built from boards 1½ inches thick, the growing space inside is 45 × 141 inches. At 12 inches deep that holds 44.06 cubic feet, 8% less than the table. Metal and composite walls are thinner, but corner posts and braces still take space, so measure between the inner walls before you order.
Beds sold at 4 × 12 ft
These beds in our catalogue are sold at this size. A maker’s stated capacity often differs from the table because the inside is smaller than the advertised size or the maker assumes a different fill depth.
Work out your own bed
Open these measurements in the soil calculator to change the depth, add more beds or split the fill into a mix. To compare the cost of bags with a bulk delivery for 1.78 cubic yards, use the bagged vs bulk soil calculator.