Raised Bed Fill
Calculator
Results
- Fill volume
- 1.727999
Home and garden results
| Fill volume | 1.727999 |
formula-map diagram
- Fill volume
- 1.727999
Home and garden relationship
Formula
V = L × W × H × n= 1.728
Note
This result uses the values you entered and a simplified planning equation; verify quantities and local requirements before purchasing or building.
More in Home and garden
See all →Frequently asked questions
How much soil mix do I need to fill a raised bed?+
Multiply the bed's interior length, width, and height to get cubic volume, then convert to the units your soil is sold in. A standard 4x8 foot bed at 12 inches deep needs about 32 cubic feet, or roughly 1.2 cubic yards.
Should I fill a raised bed with 100% bagged garden soil?+
No, pure bagged soil compacts too densely and drains poorly on its own. Most gardeners blend it with compost and a coarser material like perlite or aged bark, commonly in a mix of roughly 50-60% topsoil, 30-40% compost, and 10% aeration material.
Can I fill the bottom of a deep raised bed with something other than soil?+
Yes, this is a common cost-saving method called hugelkultur or lasagna filling: logs, branches, or straw at the bottom (making up the lower third or so) break down slowly, improve drainage, and reduce how much soil mix you need to buy for the top.
Why does my raised bed need topping off after the first season?+
Soil volume decreases as organic matter decomposes and settles under watering, typically dropping the level by 10-20% after the first year. Adding fresh compost each spring maintains the depth your plants need.
Does the calculator account for the volume taken up by bed corners or hardware?+
No, it calculates the full rectangular interior volume; the material used for corner brackets or the bed frame itself is negligible and isn't subtracted, since it takes up a trivial fraction of total volume in nearly all raised bed designs.