4 × 8 ft bed: the short answer
Filled 10 inches deep, a 4 × 8 ft raised bed needs about 26.7 cubic feet of soil — that's roughly 18 bags of 1.5 cu ft (or 14 of the 2 cu ft size), and about 0.99 cubic yards if you order in bulk.
Bed size
Soil for a 4 × 8 ft raised bed
A 4 × 8 ft bed filled 10 inches deep takes about 26.7 cubic feet of soil — about 18 bags of 1.5 cu ft, or 0.99 cubic yards in bulk. Change the depth, bag size, or mix below for your exact build.
Soil needed
—Enter bed size and depth to estimate soil.
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Soil mix breakdown
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Shopping list
Run the calculator to prepare a list.
Estimate only.
Based on the bed volume you enter. Fresh soil and compost settle, so buying a little extra is
normal. Bag counts are rounded up; confirm against your supplier's bag coverage.
Before you buy
Soil and compost settle after the first few waterings, so buying one extra bag is sensible. If you need close to a cubic yard, compare bulk delivery — it's usually cheaper per cubic foot than bags. Adjust depth and bag size in the calculator for your exact build.
Standard volume math at 10″ depth; 1 cu yd = 27 cu ft. Estimates only.
What a 4 × 8 ft bed is usually used for
A 4 × 8 ft raised bed is the classic vegetable bed: reachable from both sides, easy to divide into rows or squares, and a natural fit for tomatoes, peppers, greens, and root crops. At 10 inches deep it holds a substantial soil volume, so the main planning decision is which soil mix to fill it with.
How to decide
The fill mix drives both cost and plant results. Mel's Mix — equal volumes of blended compost, coarse vermiculite, and peat moss or coir — is a popular no-till option, while bagged raised-bed soil is simpler to order. For a bed this size, compare bulk delivery of the components against bagged mix; the difference in carrying effort is real.
Checks before you fill
- Decide the fill depth you can afford; many plants grow fine in less than 10 inches.
- Confirm whether you want a Mel's Mix-style blend or a bagged raised-bed product.
- Price bulk versus bagged before ordering, and add settling allowance for compost.
FAQ
How much soil for a 4 × 8 ft raised bed?
At 10 inches deep, a 4 × 8 ft bed holds about 26.7 cubic feet of soil (0.99 cubic yards). In bags that's about 18 × 1.5 cu ft, or 14 × 2 cu ft. Deeper or shallower fills scale directly with depth — use the calculator above to match yours.
How many bags of soil for a 4 × 8 ft bed?
About 18 bags if you buy 1.5 cu ft bags, or 14 bags of the larger 2 cu ft size. Always round up — and add one extra bag, since compost settles after watering.
What's the Mel's Mix for a 4 × 8 ft bed?
Mel's Mix is equal thirds compost, peat moss or coir, and coarse vermiculite. For 26.7 cu ft that's about 8.9 cu ft of each — roughly 6 bags of 1.5 cu ft per component.
Sources & verification
Source links and page assumptions reviewed .
- Square Foot Gardening: Mel's Mix method — Defines Mel's Mix as equal volumes of blended compost, coarse vermiculite, and peat moss or coir.
Estimate only, based on standard volume math at 10″ depth. Real fill varies with settling and supplier bag sizes; bag counts are rounded up. Confirm against your supplier before ordering.