The Deck Boards Count calculator computes the number of decking boards required for a floor or deck based on the dimension of the room or deck and the specifications of the boards.
INSTRUCTIONS: Choose units and enter the following:
- (W) Floor Width - the width of the floor or deck
- (L) Floor Length - the length of the floor or deck
- (BS) Board Size - the size of the decking boards. This is a pull-down menu where you can select from the following standard decking board sizes: 6" x 12', 6" x 16', 150 mm x 4800mm, 146 mm x 4800 mm, 225mm x 3600mm.
Number of Boards (nB): The calculator returns the number of decking boards needed to achieve the specified surface area.
Decking Boards 
Floor Joists and Plates (end pieces).
Deck Builder Calculators
- Deck Board Count: Computes the number of decking boards needed for your deck based on the size of the deck and a selection from standard deck board sizes (see below).
- Flooring Material Cost: Computes the cost of flooring based on the total area and unit pricing (e.g. $2.56 per ft2).
- Sub-floor Sheets: Computes the number of 4x8 sheets to cover floor/deck area.
- Sub-floor Cost: Computes the cost of 4x8 sheets to cover fool/deck area.
- Deck Joist Count: Computes the number of floor joists needed for a deck. It returns the number of joists and plate boards, square feet of area and the length of the diagonal.
- Deck Joist Cost: Computes the total cost of the floor joist boards.
Building Calculators
- Area of a Roof
- Pitch of a Roof
- Number of Trusses Needed for a Roof
- 4x8s needed for a roof
- Shingles needed for a roof
- Number and Length of Metal Roof Panels
- Number and Length of Purlins
- Number and Length of Rafters
- Number and Length of Rafter and Collar ties
- Number and Length of wall top and bottom wall plates
- Number of Studs for a Room
- Number of Studs in a Wall
- Room Interior Area (wall and ceiling)
- Cubic Feet in a Room (volume)
- Number of 4x8 or 4x12 Sheets for a Room
- Number and Length of Floor Joists
- Number of Joist Hangers
- Compute the Cost of Floor Joists
- Compute iJoists for larger floors
- Compute the Number of 4x8 Sheets to cover the Deck or Floor
- Compute the number of Decking Boards to cover the deck or floor
The Math / Science
The most common decking board sizes in North America are:
The North American boards are actually 5.5 inches wide. The assumption is a half inch gap between the boards. In Europe, the most common sizes are measured in millimeters as follows:
Considerations
Deck boards are either laid perpendicular to the floor or deck joists, or on a diagonal pattern. The goal is to transfer the weight on the deck boards to the floor joist in a short distance. Never run the deck boards parallel to the floor joists.
To compute the number of floor joists needed for a deck or floor, CLICK HERE.