Raised Garden Bed Soil Calculator
Estimate soil volume, full bags, bulk volume, filled area and cost for one or more identical raised garden beds.
Default project preview
5.87 yd³
Soil bags
80
Base soil volume
5.33 yd³
Growing area
96 ft²
Soil per bed
1.96 yd³
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Inside bed length
Enter this project assumption in ft. The current imperial default is 8 ft.
Inside bed width
Enter this project assumption in ft. The current imperial default is 4 ft.
Soil depth
Enter this project assumption in in. The current imperial default is 18 in.
Equal garden beds
Enter this project assumption in a unitless value. The current imperial default is 3. Minimum: 1.
Settling allowance
Enter this project assumption in %. The current imperial default is 10 %. Minimum: 0. Maximum: 50.
Soil volume per bag
Enter this project assumption in ft³. The current imperial default is 2 ft³.
Bulk soil price
Enter this project assumption in per yd³. The current imperial default is 45 per yd³. Minimum: 0.
Price per bag
Enter this project assumption in a unitless value. The current imperial default is 10. Minimum: 0.
How to read the outputs
Soil bags
rounded full bags. Default preview: 80.
Base soil volume
before settling allowance. Default preview: 5.33 yd³.
Growing area
all beds. Default preview: 96 ft².
Soil per bed
allowance included. Default preview: 1.96 yd³.
Bulk soil cost
entered bulk rate. Default preview: $264.00.
Bagged soil cost
full bags. Default preview: $800.00.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Base volume = inside length × width × soil depth × bed quantity. Settling allowance is applied before converting to bulk volume or bag count.
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: August 19, 2026
Use the Raised Garden Bed Soil Calculator to estimate soil volume for multiple beds from inside dimensions and fill depth, then compare bulk delivery with bagged soil after a settling allowance. It uses the usable interior of the bed, not the outside timber dimensions.
Calculation steps
- 1Multiply inside bed length × inside width × soil depth for one bed.
- 2Multiply by the number of equal beds.
- 3Apply the settling allowance to the soil volume, not to the outside bed dimensions.
- 4Convert the final volume to bulk cubic yards/metres or divide by bag volume and round up.
Worked numerical example
Three raised beds with 8 ft × 4 ft inside dimensions filled 18 in deep require 144 ft³ of soil, or 5.33 yd³. Adding a 10% settling allowance gives 158.4 ft³, about 5.87 yd³. If bagged soil is sold in 2 ft³ bags, the same plan requires 80 bags after rounding, which can be compared with the entered bulk-yard price.
Purchasing and rounding
Use the labeled bag volume or supplier bulk unit. Soil blends can settle after watering, but adding excessive allowance can overfill beds; keep the settling factor modest and confirm whether compost or amendments will replace part of the calculated soil volume.
Interpret the result
The result is fill volume, not soil weight. Bulk and bag totals are two purchasing paths for the same planned volume; choose based on delivery access, handling and product blend rather than comparing package counts directly.
Page-specific assumptions
- Inside dimensions represent the actual soil cavity.
- All modeled beds use the same dimensions and fill depth.
- The bed has no large internal voids or buried reservoirs unless deducted separately.
- Settling allowance is applied once to finished fill volume.
Common mistakes
- Using outside timber dimensions instead of the inside soil dimensions.
- Entering bed height when the planned soil fill is shallower.
- Mixing cubic-foot bags with cubic-yard bulk pricing without conversion.
- Adding compost or existing soil volume on top of a full-depth soil calculation instead of subtracting it.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Raised Garden Bed Soil Calculator questions
Should I fill the bed completely with soil?+
That depends on bed depth and planting goals. Deep beds may use approved lower fill layers, but root zones need suitable soil.
Why add a settling allowance?+
Loose soil commonly settles after watering and natural consolidation.
Can I mix compost and topsoil?+
Yes. Use the garden soil mix calculator to divide the total volume into components.