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CALCWOOD.
EN CZ PL DE ES FR
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BETA VERSION ALL PRO PRO FEATURES ARE TEMPORARILY FREE

Spacing Calculator

Ideal for slat walls, fences, deck joists, framing studs, and grooves.
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Calculated projects: 0
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ADVANCED MARGIN SETTINGS
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UPDATES & CHANGELOG
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v1.00 ( March 2026)
  • First public release of the even spacing calculator.
  • Calculation based on piece count or target gap size.
  • Support for symmetric and asymmetric edge margins.
  • PDF generation with running dimensions and precise technical drawing.
  • Option to choose between "Slat - Slat" or "Gap - Gap" layout types.
  • Feature to easily share the configuration via a URL link.
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🚧 BETA VERSION & FINAL WORDS

Hi! This calculator is currently in BETA. All "PRO" features are temporarily unlocked for free. The goal is to help professionals and skilled makers save time and nerves. Test it out and enjoy!

⚠️ Disclaimer: While I do my best to ensure accuracy, I am not responsible for any errors or miscut materials. Always use common sense and the "measure twice, cut once" rule.

Found a bug? Have an idea for improvement? I'd love your feedback, email me at info@tomashorsky.com.

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I develop this calculator in my free time. If it saved you time and nerves, consider supporting its future updates. Every contribution counts! 😉

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Spacing Calculator & Calcwood Project

Watch a quick video introducing the entire Calcwood project and explaining why these tools are created. The video includes English subtitles (other languages available in player settings).

What can this calculator do?
  • Universal tool for everyone: It's not just for woodworking! Whether you're building a fence, installing wood slat panels, routing grooves, or drilling dowel holes, this calculator will save you hours of math.
  • Two calculation modes: You can either enter a fixed number of items to calculate the exact gap, or set a desired gap and let the app tell you how many items you need.
  • Flexible layouts: Choose whether your layout should start and end with an item (slat) or a gap.
  • Smart margins: Need different spacing at the edges? You can easily set symmetrical or asymmetrical left and right margins.
  • Running dimensions for easy installation: No more adding up numbers on the fly. The calculator generates exact running dimensions (start, center, and end of each item), so you can just pull your tape measure once and mark everything.
  • Interactive visual preview: Everything you tweak is instantly updated in a clear visual layout, so you know exactly what the result will look like before you start building.
  • Pro PDF reports: Download your results with a single click as a clean, professional blueprint ready for the workshop.
  • Save and share: Easily save your configuration via a unique URL or QR code and return to it anytime later.
  • Metric & Imperial units: The calculator works seamlessly in both millimeters and inches (including fractions) for international projects.
Where can you use the spacing calculator in practice?
  • Wooden slat walls and acoustic panels: Exact calculation of gaps between interior design slats.
  • Fence and gate building: Quick spacing calculation for fence pickets so the fence looks symmetrical and doesn't end with a cut-off.
  • Decking and flooring: Layout of gaps between boards for proper expansion and water drainage.
  • Roof battens and counter-battens: Calculation for laying roof battens under roofing material according to an exact pitch.
  • Wooden frames and substructures: Ideal for drywallers and carpenters when creating load-bearing frames for walls and ceilings.
  • Routing grooves and decorative profiles: Precise layout for a router when you need to mill even grooves into doors.
  • Drilling holes for dowels and screws: Calculating centers for drilling joints on long boards.
  • Ribs and dividers in structures: Even distribution of reinforcements in shelves, beds, or workbenches.
  • Facade cladding and siding: Calculation for ventilated facades and cladding with an exposed gap.
  • Stair treads and railings: Calculating gaps between railing balusters to meet safety standards and look aesthetically pleasing.