How Much Soil for a 4×8 Raised Bed?
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GardenSays
You need about 32 cu ft of raised bed soil mix — that's 22 bags (1.5 cu ft) or 1.19 cubic yards in bulk.
- Volume
- 32 cu ft
- Bulk
- 1.19 cu yd
- Bags
- 22 × 1.5 cu ft
A 8×4 ft area at 12 inches deep works out to 32 cubic feet. At 1.19 cubic yards, bulk delivery is usually cheaper than 22 bags — most suppliers deliver from 1 yard up.
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.
- ✓Bagged product typically costs 2-3× bulk per cubic foot once you pass about one cubic yard (our estimate from typical retail pricing).
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. Area32 sq ft
8 ft × 4 ft
- 2. Volume32 cu ft
32 sq ft × 12/12 ft deep
- 3. In cubic yards1.19 cu yd
32 cu ft ÷ 27 (bulk delivery is sold by the yard)
- 4. In bags22 bags
32 cu ft ÷ 1.5 cu ft per bag, rounded up
Data sources
- University of Minnesota Extension — Raised bed gardens (checked 2026-07-15)
Community choice
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