Garden Bed Calculator
Calculate soil volume, mulch, and compost needed for your garden beds. Determine cubic yards, bags of soil, and material requirements for any garden project.
Step 1: Garden Bed Dimensions
Volume Formula
Rectangle: Length × Width × Depth (converted to feet)
Circle: π × Radius² × Depth
Triangle: (Base × Height ÷ 2) × Depth
Step 2: Material & Options
Standard Bag Sizes
Small bag: 40L (1.4 cu ft)
Large bag: 70L (2.5 cu ft)
Bulk bag: 1 cubic yard
Coverage: 1 cu yd covers 324 sq ft at 1″ depth
Garden Bed Material Results
Total Material Needed
Material Type Comparison
| Material Type | Weight/yd³ | Cubic Yards | 40L Bags |
|---|
Garden Bed Volume Formula
Rectangle/Square: Length × Width × Depth (in feet)
Where:
• Length = Bed length in feet
• Width = Bed width in feet
• Depth = Soil depth in feet (convert inches to feet: ÷12)
Conversions:
• Cubic Yards = Cubic Feet ÷ 27
• 40L Bags = Cubic Feet ÷ 1.4
• Liters = Cubic Feet × 28.3168
Gardening Tips
Recommended Soil Depths
• Vegetables: 12-18 inches
• Flowers: 6-12 inches
• Shrubs: 18-24 inches
• Lawn topsoil: 4-6 inches
• Mulch layer: 2-4 inches
Add 15-20% extra for compaction and settling.
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