Garden
Soil Calculator
Soil Volume Calculator
Estimate cubic feet and bags of soil or potting mix for a rectangular bed or planter.
ft
ft
in
cu ft
Results appear as you type.
How to use
- Enter bed length and width in feet.
- Enter fill depth in inches.
- Set bag size from the product label (often 1-2 cu ft).
Formula
volume_cu_ft = length × width × (depth_in / 12) bags = ceil(volume_cu_ft / bagCuFt)
Examples
Example 1
8×4 ft bed at 6 in depth = 16 cu ft → 11 bags at 1.5 cu ft.
Example 2
4×2 ft at 12 in = 8 cu ft.
Assumptions
- Rectangular footprint only.
- Depth is compacted fill depth you want after settling.
FAQ
How much soil for an 8×4 ft bed at 6 in?
16 cubic feet, which is about 11 bags at 1.5 cu ft each (rounded up).
Should I buy bulk or bags?
Bulk by the yard is usually cheaper for large beds. Bags are easier for small planters.
Do I compact the volume?
Soil settles. Many gardeners order a little extra or refill after the first watering.
Is mulch included?
No. Mulch sits on top; use the Mulch calculator for that layer.