Raised Bed Soil Calculator

Gardening

Raised Bed Soil Calculator

Free raised bed soil calculator for vegetable gardens. Enter bed dimensions in feet or metres to get total volume plus a recommended 60/30/10 topsoil, compost, and perlite mix breakdown.

Unit system

Raised bed size

Length

A 4×8 ft bed is the most popular size

Width

Depth

12 in is ideal for most vegetables

Soil mix estimate

Total fill needed: 32.0 cu ft
Cubic yards: 1.19 yd³
Topsoil (60%): 19.2 cu ft
Compost (30%): 9.6 cu ft
Perlite (10%): 3.2 cu ft

How this calculator works

Enter your raised bed length, width, and depth (feet/metres and inches/cm).
We calculate total volume in cubic feet or cubic metres.
The mix breakdown follows a proven 60% topsoil, 30% compost, 10% perlite ratio.
For a standard 4×8 ft (1.2×2.4 m) bed at 30 cm deep, you'll need roughly 0.9 m³ of fill.

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