Decking boards calculator

Calculator to estimate how many decking boards to buy for the project.

Input parameters
Area dimensions
Area 1
Area 2
Area 3
Area width W1
Area length L2
Boards size
Decking boards dimensions3

Computed parameters
Total area(s) square footage4
Sq. Ft.
Number of decking boards to buy5
Decking screws to purchase6 - Number
Weight (lb)

1 W – width of decking boards installation area in feet. Inches values should be entered as real number means 3 inches = 0.25 feet; 6” = 0.5’; 9” = 0.75’ and so on.

2 L – length of decking boards installation areas in feet. Input real numbers only.

3 There are four common sizes on of pressure-treated lumber and composite decking boards on the market to choose from. Other dimensions are very rare and excluded from calculator.

Decking calculator estimates total square footage, amount on decking boards and decking screws to purchase based on project size and boards dimensions. Calculator set to compute amount of materials to buy for up to three rectangular areas. All input parameters could be adjusted depending on decking project details.

4 Total square footage is an actual surface area of a new deck.

5 Number of decking boards to buy includes typical waste factor which is equal to 10%. Waste of materials while building a new deck greatly depends on level of customization. For complex projects waste of decking boards could increase up to 20% or even more.

6 Number of decking screws to purchase estimated accounting putting 2 screws from both board sides into each joist spaced 16 inches apart. Weight calculated based on using #10 2 ½ inches long screws accounting 79 screws per pound. 10% added for unplanned usage, possible defects and waste.

Decking boards calculator is for a general purpose only and computes parameter with high accuracy for basic projects with no customization involved. While ordering materials for complex custom projects deck plans should be analyzed or on-site inspection should be performed.