Raised Bed Soil Calculator

Step 1: Measure Your Raised Bed

Take accurate interior measurements of your raised bed:

• Length: inside measurement from end to end
• Width: inside measurement from side to side
• Height: desired soil depth (not the full board height)
• For multiple beds: calculate each separately then add totals

Step 2: Calculate Volume

Use the simple volume formula:

• Volume (cubic feet) = Length x Width x Height
• Convert to cubic yards by dividing by 27
• For bags: divide cubic feet by 1.5 (typical bag size)

Example: 8' x 4' x 1' bed = 32 cubic feet = 1.19 cubic yards = 22 bags

Step 3: Choose Your Soil Mix

Select the appropriate soil type for your plants and budget:

• Premium Mix ($35/yard): Rich organic blend, best for vegetables and herbs
• Standard Mix ($25/yard): Good quality soil for most garden plants
• Economy Mix ($20/yard): Basic soil for decorative plants or budget gardens

Recommended Soil Depths by Plant Type

DIY Soil Mix Recipe (40/30/20/10)

Create your own quality soil mix with these ratios:

• 40% Quality Topsoil: Provides structure and base nutrients
• 30% Compost: Adds organic matter, nutrients, and beneficial microbes
• 20% Peat Moss or Coconut Coir: Improves moisture retention
• 10% Perlite or Vermiculite: Enhances drainage and aeration

Soil Preparation Tips

• Add 10-15% extra soil to account for settling
• Mix components thoroughly in a wheelbarrow or on a tarp
• Test soil pH and adjust to 6.0-7.0 for most vegetables
• Consider adding slow-release fertilizer before planting
• Water soil lightly while filling to reduce air pockets
• Leave 1-2 inches below the top of the bed for mulch

Cost-Saving Tips

• Buy soil in bulk (by the yard) rather than bags for large beds
• Split bulk orders with neighbors to reduce delivery costs
• Mix your own soil using the 40/30/20/10 recipe
• Consider using a base layer of logs or branches (Hugelkultur)
• Fill bottom 1/3 with coarser materials like leaves or straw