--- title: "Deck Calculator: Joist Spacing, Boards & Materials" description: Use our free Deck Calculator to estimate joist spacing, board count, beam size, and total materials needed. Perfect for planning wood or composite deck builds. image: https://ls-usa.com/hubfs/decking-calculator.png --- [![LS Building Products](https://ls-usa.com/hs-fs/hubfs/Logo%20(13).png?width=98&height=67&name=Logo%20(13).png) ](https://ls-usa.com/) [ Get A Quote ](https://ls-usa.com/contact) ![Open](https://ls-usa.com/hs-fs/hubfs/Shape%201%20(4).png?width=31&height=26&name=Shape%201%20(4).png) ![close](https://ls-usa.com/hs-fs/hubfs/close-circle-fill.png?width=28&height=28&name=close-circle-fill.png) [ Get A Quote ](https://ls-usa.com/contact) ![LS Building Products ](https://ls-usa.com/hubfs/BG%20image.webp) ![LS Building Products ](https://ls-usa.com/hubfs/BG%20image.webp) # Deck Calculator Plan your decking project with ease using our Decking Calculator. Simply enter the size of your deck and decking boards, along with material estimates, to get an accurate calculation of the number of boards, fasteners, and total cost for your project. [![Explore Decking Products](https://no-cache.hubspot.com/cta/default/22146047/51e276d7-27fd-4992-9515-744d73a44996.png)](https://cta-redirect.hubspot.com/cta/redirect/22146047/51e276d7-27fd-4992-9515-744d73a44996)   --- ## Deck Calculator ### Size of your deck #### Length ft ft m in #### Width ft ft m in #### Square footage (area) ft² ft² m² ### Size of decking boards #### Length ft ft m in #### Width in in cm ### Material estimations #### Number of boards (i) #### Fasteners used Choose fastener type Screws / nails Hidden clips #### Joist spacing in in cm #### Number of screws / nails ### Cost estimations #### Price per board $ #### Price for all boards $ #### Cost of fasteners $ #### Total cost $ Share result Reload calculator Clear all fields --- *This calculator is for general informational purposes only. Please verify all results with a licensed contractor, as actual project requirements may vary.* ## **Key Features** **✔ Automatic deck area calculation** based on your input dimensions in feet, meters, or inches. **✔ Smart board quantity estimator** that includes a 10% buffer for cutting and waste. **✔ Support for screws or hidden clips**—automatically adjusts fastener counts based on method. **✔ Flexible joist spacing input** for accurate screw or nail calculations per board row. **✔ Cost breakdown in real-time** based on board prices and fastener cost inputs. **✔ Easy-to-share project summary** with one-click clipboard copy of area, material needs, and total cost. ## **How to Use It** 1. **Measure Your Deck:** Input your deck’s length and width using your preferred unit. The tool calculates the total square footage or meters automatically. 2. **Enter Board Dimensions:** Provide the length and width of your decking boards. The calculator estimates how many boards you’ll need, including a 10% overage. 3. **Select Fastener Type:** Choose between screws/nails or hidden clips. If using screws, specify your joist spacing to get a precise screw count. 4. **Set Material Costs:** Input the cost per board and fastener pack. The calculator adds it all up and shows you the final total immediately. 5. **Copy & Share the Results:** Use the “Share result” button to copy the deck area, board count, fastener estimate, and total cost to your clipboard—great for quick quotes or purchase planning. --- ## Build with Confidence Our [Deck Calculator](https://ls-usa.com/deck-calculator) helps streamline the planning process for any deck build—whether you’re building a backyard escape or a rooftop oasis. It’s the perfect tool for getting materials right the first time. Start decking smarter with the LS Deck Calculator today. ### Questions about any of our products? We're ready to help you find a solution! 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