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Wooden Planter Box Materials Calculator

Wooden Planter Box Materials Calculator

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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

$137.12
2× 4x4 | 4× 2x4 | 9× 5/4x6

Western Red Cedar Total

$343.74
2× 4x4 | 4× 2x4 | 9× 5/4x6
Complete Cut List

4x4 POSTS

  • 4 pcs @ 23.00"

2x4 FRAMING & SUPPORTS

  • 4 pcs @ 41.00" — Long Side Rail
  • 4 pcs @ 17.00" — Short Side Rail
  • 2 pcs @ 41.00" — Inside Bottom Support Cleat

5/4x6 DECK BOARDS (SLATS & CAP)

  • 22 pcs @ 20.00" — Vertical Slat
  • 7 pcs @ 17.00" — Drainage Floor Slat
  • 2 pcs @ 50.00" — Mitered Top Cap (Long)
  • 2 pcs @ 26.00" — Mitered Top Cap (Short)
Board Optimization

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

4x4 Material (2 boards required)

4x4 Post23.0"
4x4 Post23.0"
4x4 Post23.0"
4x4 Post23.0"
3.5" waste

2x4 Material (4 boards required)

Long Rail41.0"
Long Rail41.0"
13.8" waste
Long Rail41.0"
Long Rail41.0"
13.8" waste
Bottom Cleat41.0"
Bottom Cleat41.0"
13.8" waste
Short Rail17.0"
Short Rail17.0"
Short Rail17.0"
Short Rail17.0"
27.5" waste

5/4x6 Material (9 boards required)

Cap (Long)50.0"
Cap (Short)26.0"
Floor Slat17.0"
2.6" waste
Cap (Long)50.0"
Cap (Short)26.0"
Floor Slat17.0"
2.6" waste
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
15.5" waste
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
15.5" waste
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
15.5" waste
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
15.5" waste
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
Vert. Slat20.0"
15.5" waste
Vert. Slat20.0"
Vert. Slat20.0"
Floor Slat17.0"
Floor Slat17.0"
Floor Slat17.0"
4.4" waste
Floor Slat17.0"
Floor Slat17.0"
61.8" waste
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