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Stair Spindle Spacing Calculator
Calculate the number of balusters (spindles) needed and the gap between them to comply with UK Building Regulations Part K — the 100mm sphere rule.
📏 Part K compliant
🪜 Baluster spacing
⚡ Instant layout
Spindle Spacing Calculator
Calculate baluster layout & compliance
Staircase Measurements
mm
The clear distance between the inner faces of the two end newel posts
mm
Typical: 35–45 mm
mm
For info only (not used in gap calc)
Calculation Mode
mm
Must be under 99mm to comply with UK Building Regulations
Additional Options
Spacing Summary
Your baluster layout breakdown
Enter your staircase measurements and choose a calculation mode, then click Calculate Spacing to see your spindle layout.