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Deck Board Calculator

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Estimate the decking for a new deck so you order the right number of boards without a second trip to the lumber yard. Enter the deck length and width in feet, the width of one deck board in inches, the gap you plan to leave between boards, and the length of the boards you will buy. The calculator figures the effective coverage of each board including its gap, works out how many rows the deck needs, converts that to a total board count and total linear footage, and adds a waste allowance for cuts and mistakes. It assumes boards run across the width, which you can flip by swapping the length and width inputs. A five percent to ten percent waste factor covers most simple rectangular decks. Everything is computed instantly in your browser with no signup and nothing sent to a server.

How to use Deck Board Calculator

  1. Enter the deck length and width.
  2. Enter the board dimensions.
  3. Read the number of deck boards and linear feet needed.

Frequently asked questions

How are deck boards counted?

It divides the deck area by the coverage of one board, accounting for board width and the gap between boards.

Does it account for the gap between boards?

Yes. A small spacing gap between boards is included so the estimate reflects real coverage on the deck.

Does it report linear feet?

Yes. It gives the total linear feet of decking as well as the board count for ordering.

What is Deck Board Calculator?

Estimate the decking for a new deck so you order the right number of boards without a second trip to the lumber yard. Enter the deck length and width in feet, the width of one deck board in inches, the gap you plan to leave between boards, and the length of the boards you will buy.

Is Deck Board Calculator free to use?

Yes. Deck Board Calculator is completely free, with no sign-up and no usage limits.

Does Deck Board Calculator work in a web browser?

Yes. Deck Board Calculator runs in any modern web browser. There is nothing to download or install.

Is my data private with Deck Board Calculator?

Yes. Deck Board Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.