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Wooden Planter Box Materials Calculator

A rectangular wooden planter box filled with soil, red geraniums, purple lavender, and green foliage. The planter has a slatted design and sits on a white background.
Diagram of a wooden planter box showing top, side, and exploded views, with labeled parts such as slats, posts, rails, and caps, along with dimensions and construction details.

Planter Project Estimator

GTA WoodWorks • DIY Confidence Training

Project Dimensions

*Math automatically deducts 1" from frame height to account for 5/4 top cap thickness.

Stock Lumber Pricing
⚠️ Pricing Notice: Lumber prices fluctuate and are not updated in real-time. Default prices reflect GTA market rates as of May 8, 2026.

Default prices are for 8 ft (96") boards. If you switch to 10’ or 12’, update the unit prices manually below. Verify current rates at your local supplier.
Pressure Treated Prices
Premium Cedar Prices
Material Cost Comparison

Pressure Treated Total

$0.00
 

Western Red Cedar Total

$0.00
 
Complete Cut List
Board Optimization

Diagrams based on standard blade kerf (1/8"). Labels match GTA WoodWorks technical plans.

Step 2: Build the Frame
Assembling the long side panels using 4x4 posts and 2x4 rails[cite: 86, 102].
4x4 Post (23") Long Side 2x4 Rail
Step 3: Install Bottom Cleats
Positioning the 41" cleat flush with the bottom edge of the long rail[cite: 123, 125].
Inside 2x4 Bottom Cleat Inside Face of Bottom Long Rail
Step 4: Install Vertical Slats
Inserting 5/4x6 vertical slats with a 1/4" gap between the top and bottom rails[cite: 133, 135].
1/4" Spacer Block 5/4x6 Vertical Slats
Step 6: Install the Top Cap
45° mitered corners measured from long-point to long-point[cite: 163, 169].
Measure Long-Point to Long-Point (50") Top-Down View