Deck Flooring Calculator and Price Estimator

Estimating composite deck flooring materials, hidden fasteners, and screws

Calculate how many deck boards, hidden fasteners, and screws are needed for your deck given the deck size and preferred board length. Estimate the cost of decking, hidden fasteners, and screws by entering a price per board.

Optionally enter the price per deck board

Material Estimate:



Decks are a great way to add usable outdoor space to your home. There are many flooring surface options, including composite decking, cedar lumber, pressure treated lumber, and exotic hardwoods. Consider budget, durability, and maintenance when choosing the flooring material for your project. composite flooring is virtually maintenance-free, but it carries a higher cost than pressure treated or cedar lumber. It’s also important to consider the flooring fasteners you want to use, such as a hidden fastener or face-screwing the boards so you can estimate the correct materials to order.

To use our calculator you’ll need to know the size of your deck and the boards you want to use, including the width(3 12” or 5 12“) and the length(8′, 10′, 12′, or 16′). You’ll also want to provide the joist spacing you are planning to use, eg. (12″, 16″, 20″, or 24”). If you want a deck flooring price estimate you can also include the price per board. If you need to estimate your railing balusters use our baluster calculator.

Estimating Deck Materials

How to estimate deck flooring and the number of boards needed

Estimating deck flooring materials begins with finding the square footage of your project. You can multiply the deck length in feet times the width in feet to find the square footage. See our square footage calculator for tips on calculating the square footage of oddly shaped areas.

Once you have the square footage of the deck you need to find the square footage of the board you’ve selected in feet. To find this multiply the width of the floor board in feet times the length in feet. You can use our feet and inches calculator to convert the board width in inches to feet.

To find the number of boards you need, divide the total deck square footage by the board square footage, eg. total ft2 / board ft2.

Deck Estimating Tips

Find how much composite decking you need

In addition to measuring the area of the deck you should also measure how much lumber will be needed for stairs. It’s a good idea to order 10% additional lumber to account for waste and off-cuts. Finally, don’t forget to order enough fasteners for your project, such as a hidden fastener, or stainless/coated screws. You will want to order the correct fasteners for the type of decking you’re ordering, some products such as composite boards may require a specific type of hidden fastener or screw. See our deck cost guide to get an idea of how much it costs to build a deck.

We have a number of great resources to help with your deck project. Get a free estimate from a local contractor if you’re interested in having someone else quote the project. Estimate how much concrete you need for your posts with our concrete hole calculator. Our board footage calculator can help estimate the cost of exotic hardwoods or lumber that is sold by the board foot.