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Free garden planning tool: enter the interior size of your bed and how deep you will fill it, your soil or mix cost per cubic foot, a settling allowance, and a blended frame cost per foot of perimeter. Add a hardware line for brackets, fabric, and extras. Output is a rough materials budget—not a contractor bid.
Last updated: April 8, 2026
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Blend bag price ÷ cubic feet per bag if needed.
Blended $/ft for boards, screws, corner posts—your judgment.
Brackets, fabric, staples, optional liner.
Soil volume (with wastage)
35.2 ft³
Nominal: 32 ft³
Perimeter
24 ft
Planning estimate: soil volume assumes a rectangular interior fill; board thickness, stepped walls, and caps change lumber. Add landscape fabric, drainage, and delivery fees separately.
Interior box
L × W × D
Matches typical bag-yield math.
Blend or mix
Your price
Convert from bag size when needed.
2(L + W)
$/ft
Simple proxy for lumber kits.
Top-off
Adjustable
Extra soil after watering.
Hardware
Fabric, etc.
One line for small extras.
Raised bed soil
Cross-check
Use the dedicated soil calculator for weight and mix splits.
8×4×1 ft bed, $4.50/ft³ soil, 10% wastage, $8/ft frame, $25 hardware
Soil volume (with wastage)
35.2 ft³
Rough total
$375
Soil volume is the interior length times width times fill depth in feet, giving cubic feet. We multiply by (1 + wastage%) before multiplying by your soil price per cubic foot. Frame cost is perimeter times your blended dollars per foot. Hardware is a flat add-on. The total is the sum of those three components.
soil ft³ = length × width × depthsoil with wastage = soil ft³ × (1 + wastage% ÷ 100)soil $ = soil with wastage × ($/ft³)frame $ = 2 × (length + width) × ($/ft perimeter)total ≈ soil $ + frame $ + hardware $Soil volume only? Raised bed soil calculator and garden fertilizer.
Get a Custom Calculator for Your SiteEnter fill depth as 1.5 ft for an 18-inch soil column. Soil volume scales linearly with depth, so a 50% deeper bed needs roughly 50% more soil mix before wastage.
Share it with your community garden or school plot
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