How Much Soil for a 4×2 Raised Bed?
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GardenSays
You need about 8 cu ft of raised bed soil mix — that's 6 bags (1.5 cu ft) or 0.3 cubic yards in bulk.
- Volume
- 8 cu ft
- Bulk
- 0.3 cu yd
- Bags
- 6 × 1.5 cu ft
A 4×2 ft area at 12 inches deep works out to 8 cubic feet. At under a cubic yard, bags are the practical choice: 6 × 1.5 cu ft bags.
A common extension recipe for filling raised beds: roughly 50-60% topsoil, 30-40% compost, and up to 10% aeration material such as perlite or coarse bark (our estimate of the typical published range).
Why
- ✓Buying by volume (not guessing by weight) is the only reliable way to fill a bed — moisture makes weight wildly inconsistent.
- ✓Below one cubic yard, delivery fees usually erase the bulk discount.
When this doesn't apply
- →Material settles: expect a raised bed fill to drop 10-20% in the first season; buy a little extra or top up later.
- →Irregular or L-shaped areas: split into rectangles, run each through the calculator, and add the results.
How this was calculated
- 1. Area8 sq ft
4 ft × 2 ft
- 2. Volume8 cu ft
8 sq ft × 12/12 ft deep
- 3. In cubic yards0.3 cu yd
8 cu ft ÷ 27 (bulk delivery is sold by the yard)
- 4. In bags6 bags
8 cu ft ÷ 1.5 cu ft per bag, rounded up
Data sources
- University of Minnesota Extension — Raised bed gardens (checked 2026-07-15)
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