Use this workshop calculation to turn measured dimensions and the selected construction convention into a cut, spacing, fit, or material-planning value.

Gap (cm)

Clear gap between infill posts or balusters in centimeters, from 0 to 30.

Check whether a railing infill gap keeps the 12 centimeter child-safety limit so a small head cannot pass through. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Is child safe

True when the gap is at most the 12 centimeter child-safety limit.

Maximum allowed gap (cm)

Maximum allowed gap in centimeters for child safety, always 12.

• Nominal dimensions, kerf, moisture movement, hardware clearances, wall squareness, and manufacturer instructions can change the required shop dimension. Measure the actual assembly and test critical joints on scrap before cutting finished material.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Complement the calculated dimension with a physical story stick, dry fit, or full-size layout. Follow the hardware, coating, adhesive, or machine manufacturer's limits where they differ from a rule of thumb.

• Post Spacing Calculator

  Compute the number of railing posts needed for a run so the actual spacing never exceeds the maximum allowed post spacing.

• Arbeitsplatte Stossfuge 5mm

  Remaining countertop run after reserving a 5 mm movement gap at a butt joint; check finish and sealant requirements separately.

• Handrail Diameter Check

  Check whether a handrail diameter lies in the comfortable 42 to 48 mm grip range and report the deviation.