How Much Soil for a Raised Bed?
Estimate soil volume for raised garden beds before buying bags or bulk mix.
Last reviewed: June 2026
Short Answer
Raised bed soil volume = length x width x height in feet. Cubic yards = cubic feet / 27. Bags = cubic feet / bag volume. Add a settling buffer because soil often compresses after watering.
Use the raised bed soil calculatorPractical Explanation
Raised beds are simple volume calculations, but bag sizes vary and soil settles. If you fill the bottom with logs, branches, or other material, reduce the fill percentage.
Home gardeners can use this to avoid underbuying bags. Landscapers and small crews can use it to plan bulk soil deliveries and staged material lists.
Simple Formula
Soil volume = bed count x length x width x fill height in feet. Cubic yards = cubic feet / 27.
Example: one 8 ft x 4 ft bed, 12 inches deep
- Convert height: 12 inches = 1 ft
- Volume: 8 x 4 x 1 = 32 cubic feet
- Add 10% settling buffer: 32 x 1.10 = 35.2 cubic feet
- Convert to yards: 35.2 / 27 = about 1.3 cubic yards
Plan for about 35 cubic feet, or about 1.3 cubic yards, before checking bag size or bulk mix details.
Common Mistakes
- Forgetting that soil settles after watering.
- Confusing quarts, cubic feet, and cubic yards.
- Filling a tall bed completely with expensive bagged mix when a partial-fill method is intended.
FAQ
How many cubic feet are in a cubic yard of soil?
There are 27 cubic feet in one cubic yard.
Should I add extra soil for settling?
Usually yes. Fresh soil often settles after watering, especially in deep beds.
Estimate Disclaimer
These guides and calculators provide planning estimates. Bag yields, material density, compaction, waste, site conditions, supplier measurements, and local requirements can vary. Confirm quantities with your supplier, contractor, plans, or local code requirements when needed.
Ready to Estimate Your Project?
Use the calculator to turn your measurements into an approximate material list before you buy, quote, or start work.
Use the raised bed soil calculator