Build-Up, Clearance & Scale Calculator

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Floor build-up vs. door gap

Underlay thickness mm

New floor thickness mm

Existing door gap mm

Gap you want after trimming mm

Furniture vs. walkway, optional

Room depth mm

Zone A depth (e.g. desk) mm

Zone B depth (e.g. chair) mm

Minimum walkway mm

Scale drawing, optional

Room length mm

Scale, 1:

Paper width mm — A4 landscape

Paper height mm

Margin, each side mm

Enter the underlay and floor thickness and the existing door gap, then press Calculate.

From the book — Chapter 9. Build-up = underlay + new floor thickness. The door binds if the build-up exceeds the existing gap. Walkway left = room depth − the furniture zones against that wall.

Matches Chapter 9's box-room fit checks exactly. Everything stays in your browser — no sign-up, nothing stored.