How it works
cut list from box L×W×depth + leg height; boards = ceil(linear in ÷ 96 × 1.1); soil = L×W×depth
Lumber & soil by elevated box size (8 in deep, 30 in legs)
Lumber & soil by elevated box size (8 in deep, 30 in legs)
| Box size | Boards to buy | 1.5 cu ft soil bags | Plants (12 in spacing) |
|---|---|---|---|
| 2 × 2 ft | 8 | 2 | 4 |
| 4 × 2 ft | 10 | 4 | 8 |
| 4 × 4 ft | 14 | 8 | 16 |
Boards are nominal 8-ft lengths with 10% waste, split across 2x4 legs, side boards, and 1x2 trim. An elevated box is usually only 8 inches deep, so it needs far less soil than a ground bed of the same footprint.
Frequently asked questions
How much soil does an elevated planter need?
Much less than it looks, because the soil box is usually only 8 inches deep. A 4×2 ft box 8 inches deep holds about 5.3 cubic feet — roughly 4 of the 1.5 cu ft bags. A 4×4 box needs about 10.7 cubic feet (8 bags).
What wood should I use for a raised bed with legs?
Rot-resistant cedar is the most popular for the soil box and frame; 2x4s make sturdy legs. Avoid old pressure-treated lumber for edibles. Line the inside with landscape fabric and drill drainage holes.
How deep should an elevated garden bed be?
Eight to twelve inches of soil is plenty for greens, herbs, and most vegetables. Deeper-rooted crops like tomatoes or carrots do better at 10–12 inches. Legs typically bring the top to a comfortable 30 inches.