Access Floor Cable Cutout Area Calculator

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Imperial · sales tax

Number of Cable Cutouts

The total number of grommet or brush-style cable cutouts planned across all access floor panels.

Count each opening where cables pass through the raised floor, such as at a workstation, equipment rack, or floor box location.

Area per Cutout

The area of a single cutout opening — a 100 × 100 mm grommet cutout is 0.01 m², about 0.11 sq ft.

A common grommet cutout is roughly 100mm x 100mm (about 0.01 m², or 0.11 sq ft), but round brush cutouts and larger floor box openings vary — check your specific fitting's dimensions. The range stops at a 300mm x 300mm (0.09 m²) opening; anything larger should be confirmed against the panel manufacturer's cutout and reinforcement guidance.

Total cutout area

1.292 sq ft

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How this was calculated

Formula source(s)

Total cutout area = number of cutouts × the area of each cutout, a simple aggregation for planning grommet/brush-cutout openings in access floor panels

Inputs used

Number of Cable Cutouts: 12
Area per Cutout: 0.11 sq ft

Final result1.29 sq ft

What this calculation does not cover

This is the GROSS opening cut in the panels, not the open area air can pass through. On a pressurised underfloor plenum that distinction is the whole game: a brush grommet or a sealed gasket blocks most of an opening, an unfitted hole blocks none, and the unsealed fraction of this total is what bleeds plenum static pressure out beside a cabinet instead of delivering it up through the perforated tiles where it was aimed.
It totals openings you have already decided on and sizes none of them. What a cutout has to clear is the cable bundle at its fattest — connector bodies included, at the bend radius the cable is rated for, not the diameter of a jacket lying flat. A 100 mm (4 in) square sized off a cable schedule is the one that has to be enlarged after the panels are down and the racks are loaded.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.1.1

Regulatory standards & verification citations1

Total cutout area = number of cutouts × the area of each cutout, a simple aggregation for planning grommet/brush-cutout openings in access floor panels

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Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

Installing a Raised Access Flooruses this calculator

A raised access floor is governed by the single loaded caster that crosses it, not by the kilonewtons per square metre on the schedule.

Taking On a Cat A Shell and Scoping the Cat B

How to calculate access floor cable cutout area in 3 steps

Number of Cable CutoutsThe total number of grommet or brush-style cable cutouts planned across all access floor panels.

Area per CutoutThe area of a single cutout opening — a 100 × 100 mm grommet cutout is 0.01 m², about 0.11 sq ft.

Total cutout areaThe tool computes the total cutout area from those figures and shows the formula, its sources, and a confidence rating alongside it.

Area per Cutout	Total cutout area (sq ft)
0.05 sq ft	0.6
0.1 sq ft	1.2
0.15 sq ft	1.8
0.2 sq ft	2.4

Area per Cutout

Total cutout area (sq ft)

0.05 sq ft

0.6

0.1 sq ft

1.2

0.15 sq ft

1.8

0.2 sq ft

2.4

Frequently asked questions

Why does total cutout area matter for an access floor?

Each cutout removes structural material from a panel, so the total cutout area — together with its layout — factors into whether reinforcement or a dedicated cutout-rated panel is needed at that location, per the panel manufacturer's guidance.

Does cutout size vary by fitting type?

Yes — a simple grommet cutout is typically around 100mm x 100mm, while round brush cutouts, larger floor boxes, and multi-cable openings can be significantly larger. Use the actual area of your specific fitting.

Does this calculator check whether a panel needs reinforcement?

No — it only totals the cutout area across all planned openings. Any individual panel with a large cutout, or multiple cutouts close together, should be checked against the access floor panel manufacturer's cutout and reinforcement guidelines separately.