Home Heat Loss Drawers Smart Mix (2K) Spacing / Slats Shelf Sag Stairs About Project FAQ Premium Access My Account
Not logged in
-
Drawers - Kitchen
11.06.2026 Drawers
Stairs - Workshop
17.04.2026 Stairs
Smart Mix - Epoxy
22.08.2026 Smart Mix
Shelves - Living Room
05.09.2026 Shelves
Spacing - Fence
12.09.2026 Spacing
Drawers - Bathroom
20.09.2026 Drawers
Save your projects
and browse calculation history.
I already have a License Key +
CalcWood Logo
CALCWOOD.
EN CZ PL DE ES FR
Powered by BUILD FOR FUN
BASIC VERSION - FREE
PRO PRO FEATURES ARE LOCKED

Even Spacing Calculator

Precisely calculates equal gaps, center-to-center spacing, and edge offsets within a given width.
For slats, fence pickets, posts, dowels, grooves, and timber or steel structures.
Counter
Calculated projects: 0
Need help with the terms?
Practical tips and quick search in the knowledge cards are waiting below.
What do you want to calculate?
Loading preview...
+
-
+
-
+
-
ADVANCED MARGIN SETTINGS
PRO
How does the layout start and end?
?
Choose whether the layout starts and ends with a slat or a gap. Useful for fences, cladding, battens, and grooves where one side may connect to a wall, post, or frame.
Link copied!

Practical Applications

Spacing Calculator & Calcwood Project

Watch a quick video introducing the entire Calcwood project. The video includes English subtitles.

What can this calculator do?

  • Three Calculation Modes: Calculate by item count, target gap, or exact center-to-center spacing with automatic centering.
  • Smart Margins: Set custom offsets for left and right edges.
  • Four Edge Layouts: Start and end with a slat or a gap, including asymmetric edge variants.
  • Running Dimensions: Mark everything from a single zero point.
  • Visual Preview: Instant updates of your layout as you type.
  • PDF Export: Clean technical drawings for your workshop with the same 0.5 mm rounding as the web results.

Professional Tips for Perfect Precision

Perfect layout is the mark of a pro. Avoid these common mistakes with our tool:

Cumulative ErrorNever measure piece-by-piece. Small errors add up and can throw your layout off by inches.
Math CertaintyHitting an exact gap across a total width requires complex equations. We solve them instantly.
Scrap PreventionPlan your layout to avoid ugly, tiny offcuts at the ends of your project.
Running DimsPull your tape measure once, lock it, and mark all points. It’s the fastest route to precision.
On-Center SpacingCrucial for drilling. Center-to-center distance is often more important than the gap itself.
Visual BalanceSymmetry defines quality. Adjust edge offsets with two clicks for a professional look.

⚠️ Pro Tip: Always layout the entire project using running dimensions before you start any final cuts or drilling.

Ratings & Reviews

Checking calculator ratings...
Loading reviews...
✕

Did the calculator help you?

Your feedback helps improve CalcWood for all woodworkers and DIYers.

UPDATES & CHANGELOG
+
v1.06 ( October 2026)
  • Center points only: A zero item width now calculates center positions for screws, holes, dowels, or mounting points.
  • Clearer outputs: Results, the technical preview, and PDF now show center marks and their positions in this mode.
  • Preview fixes: Improved center rendering, dimensions, detail positioning, and localized view labels.
v1.05 ( October 2026)
  • Units in every language: You can switch between metric and imperial units in every language version of the calculator.
  • Layout preserved: Switching units preserves the calculation mode, item count, edge layout and expert settings. Unchanged values return without losing precision.
  • Clear manual changes: User-modified values are highlighted in yellow, making it easy to see which inputs differ from their defaults.
v1.04 ( September 2026)
  • Added a new calculation mode based on an exact center-to-center spacing.
  • The calculator automatically determines the maximum item count, preserves the requested spacing, and centers the entire layout evenly.
  • Results, the technical drawing, and the PDF now show the fixed offset, automatic centering, and first center position separately.
v1.03 ( September 2026)
  • Added four edge layout types: slat–slat, gap–gap, slat–gap, and gap–slat.
  • The new asymmetric variants make it easier to handle layouts connected to a wall, post, frame, or corner.
  • Redesigned the layout switch icons into wider technical diagrams with equal slat widths and clearer gap visualization.
  • The PDF export now respects the selected edge layout and rounds metric values to the same 0.5 mm precision as the web results.
v1.02 ( September 2026)
  • Added a separate center-to-center spacing value to the results and PDF export for faster layout marking of slats, pickets, battens, or grooves.
  • Improved the center dimension label in the running dimensions list, making it clear that the slat center is measured from the start edge.
v1.01 ( June 2026)
  • Added full fraction support for the imperial system (inches). When you switch the calculator to inches, all results and PDF exports are now automatically displayed in easy-to-read fractions (up to 1/16 inch precision).
  • Decimal numbers entered as input are automatically converted to the nearest practical fraction, making workshop tasks much easier.
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.
Have a suggestion or found a bug? +
📌 FINAL WORDS

Hi! The goal of this tool is to help professionals and skilled makers with their projects. Basic features are and always will be free. Advanced "PRO" settings are paid and help fund the server costs and future development of this service. I hope this calculator saves you a lot of time and nerves!

⚠️ 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.

Terms of Service | Privacy Policy
SUPPORT THE DEVELOPMENT?

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

Donate & Support
Powered by Tomas HORSKY