Decking Calculator
Calculate decking calculator linear feet boards. Precise material estimations for building contractors and DIY home builders across USA/UK/Canada.
Calculate Decking Calculator
Enter project dimensions below to compute required material quantities.
Calculation Results
Calculated using verified construction formula: Stock Boards = Math.ceil( ( ( (Deck Length * 12 / 5.5) * Deck Width ) / Board Length ) * (1 + Waste Margin Pct) )
Quick Summary
The Decking Calculator computes stock decking board counts (12ft, 16ft, 20ft), total linear feet, 3-inch deck screw boxes, concealed fastener clip boxes, payload weight, and material costs for wood and composite decking.
- Stock Length Board Scoping: Converts surface square footage into exact 12-foot, 16-foot, or 20-foot board counts.
- Fasteners & Hidden Clips: Calculates 3-inch face screws (4 per sq ft) and concealed deck clips for grooved boards.
- Linear Feet to Square Feet Conversion: Translates 5.5-inch board face widths into total linear feet.
How to Use the Decking Calculator
- Enter Deck Length in feet.
- Enter Deck Width in feet.
- Select Stock Board Length Option (16-foot boards standard).
- Adjust the Waste Margin (%) (10% standard).
- Click Calculate to view stock board counts, total linear feet, screw boxes, hidden clips, weight, and decking cost.
Decking Calculator Formula & Method
This tool utilizes verified construction geometric formulas to compute material requirements:
Stock Boards = Math.ceil(Total Linear Feet / Stock Board Length)
Deck Screws = Math.ceil(Surface Area * 4)
Where:
- 5.5-Inch Face Width: Actual face coverage width of standard 5/4x6 wood decking or 5.5-inch composite boards.
- Concealed Fastener Clip: Hidden stainless steel clip inserted into grooved board edges for fastener-free deck surfaces.
- Linear Foot: Length measurement along decking boards regardless of width.
Worked Example
Example: 24ft Long * 14ft Wide Deck (336 sq ft) 16-Foot Stock Boards
- Surface Area: 24 ft * 14 ft = 336 sq ft
- Total Linear Feet (with 10% Waste): ((24 * 12 / 5.5) * 14) * 1.10 = 806.4 linear feet
- 16-Foot Boards Needed: 806.4 / 16 = 50.4 -> 51 Boards
Applying the formula yields:
Total 16-Foot Stock Boards: 51 Boards
Total Decking Linear Feet: 806.4 LF
3-Inch Screws (5lb Boxes): 1,344 screws -> 4 Boxes (5lb)
Estimated Decking Cost: 806.4 * .80 = ,257.92
What This Calculator Includes vs. Does Not Include
What This Calculator Includes
- Decking Surface Material Engineering: Measures 12ft, 16ft, and 20ft stock boards, total linear feet, 3-inch deck screws, concealed fasteners, weight, and material costs.
- 5.5-Inch Board Face Calculations: Accurate width coverage math.
What This Calculator Does Not Include
- Framing Joists & Ledger Bolts: Under-deck structural joist framing.
Tips & Best Practices
- Order 16-Foot or 20-Foot Boards to Minimize Seams: Selecting boards that match your deck length eliminates unattractive butt joints across the deck surface.
- Use Stainless Steel Screws Near Saltwater Coasts: Coated steel deck screws corrode in coastal marine environments; use 305 or 316 grade stainless steel screws.
Common Mistakes to Avoid
- Over-Tightening Hidden Deck Clips: Over-torquing hidden clip screws distorts plastic spacers, resulting in uneven board gaps.
Frequently Asked Questions (FAQ)
How many 16-foot deck boards for a 24x14 deck?
A 24x14 foot deck (336 sq ft) requires 51 16-foot decking boards (806 linear feet).
How do you calculate linear feet of decking?
Multiply (Deck Length in inches / 5.5) by Deck Width in feet. Example: (288 / 5.5) x 14 = 733 linear feet (add 10% waste = 806 LF).
How many deck screws per square foot?
Plan on 4 deck screws per square foot (2 screws per joist intersection at 16 inches on-center).
How many screws in a 5lb box of deck screws?
A 5lb box contains approximately 350 3-inch polymer-coated deck screws.
How much does 5/4x6 decking cost per linear foot?
Pressure-treated 5/4x6 decking costs .50 to .20 per linear foot; composite decking costs .50 to .00 per linear foot.
What is the difference between solid and grooved composite decking?
Solid boards are face-screwed at board edges; grooved boards feature side slots designed for hidden fastener clip systems.
How heavy is 800 linear feet of decking?
800 linear feet of pressure-treated decking weighs approximately 1,840 lbs.
Can deck boards be laid diagonally?
Yes. Diagonal decking laid at 45 degrees increases linear footage required by 15% and requires joists at 12 inches o.c.
Is this decking calculator free to use?
Yes, TibCal's Decking Calculator is 100% free.