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:
Number of Boards (nB): The calculator returns the number of decking boards needed to achieve the specified surface area. If the width (W) is less than 24 feet, the calculator also returns an alternative count using board lengths (BL) requiring no splicing.
Decking Boards Floor Joists and Plates (end pieces).
The most common decking board are pressure treated pine boards that are six inches (6") wide and at different length ranging from three feet (3') to twenty four feet (24') in North America. The North American boards are actually 5.5 inches wide. The assumption is a half inch gap between the boards.
Deck boards are either laid perpendicular to (across) 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.
You should NEVER splice decking boards between joists. Splices should always occur where both board ends are on top of a joist, and in many cases, boards must be shortened (cut off) to end at a joist. The algorithm used in this calculator uses the joist span to estimate the cut-off of the decking boards.
When the width of your deck is longer than the length of your boards, splicing is required. If possible, you might want to consider longer boards if they are available. Longer boards will reduce or eliminate splicing which saves labor, and in some cases may even save material costs. For example, at the time of this writing, a nationally advertised provider of decking boards listed 5/4" thick, pressure treated, six inch wide deck boards that were $6.84 for 8' boards and $8.70 for 10' boards. In the graphic below, you can see where 10' boards only required 12 boards to cover the deck and 8' boards required 17 boards and 13 splices. In this case, the 10' boards ended up costing less at $104.40 verses $116.28.
Decking boards, the planks that make up the surface of a deck, can be constructed from a variety of materials. Each material has its own set of characteristics, including durability, appearance, maintenance requirements, and cost. Here are some common materials used for decking boards:
Deck Builder Calculator provides estimates for a simple rectangular deck project. Calculator functions include the following: