SettingsSettings for this calculationUS
The overall diameter of the revolving door drum/enclosure.
Use the manufactured diameter of the revolving door unit itself (drum and wings), from the manufacturer's spec sheet.
The extra clearance required around the door beyond its diameter.
This allowance varies by manufacturer and door configuration (3-wing vs. 4-wing, manual vs. automated) — confirm the exact figure from the specific unit's installation drawings.
Required vestibule footprint area
63 sq ft
Clearance allowance and exact footprint shape vary by manufacturer and door configuration (3-wing vs. 4-wing, manual vs. automated) — confirm the specific unit's required footprint from its installation drawings.
They open the calculator with your figures already in it
Commercial Revolving Door Vestibule Footprint Calculator: 63.03 sq ft — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
Show calculation logicHide calculation logic
How this was calculated
Formula source(s)
- Footprint area = π × (Door Diameter ÷ 2 + Clearance)² — the standard method for estimating the circular floor space a revolving door assembly (drum, wings, and enclosure) requires, including a surrounding clearance allowance from the specific door manufacturer's installation drawings.
Inputs used
- Revolving Door Diameter
- 7 ft
- Surrounding Clearance Allowance (per Manufacturer)
- 11.75 in
Confidence note: Clearance allowance and exact footprint shape vary by manufacturer and door configuration (3-wing vs. 4-wing, manual vs. automated) — confirm the specific unit's required footprint from its installation drawings.
What this calculation does not cover
- Covers the drum and nothing beside it. A revolving door cannot serve as the required means of egress on its own: codes call for a conforming side-hinged swinging door in the same wall within about 3 m (10 ft), and they credit the revolving door with only a capped share of the occupant load. That swing door and its own maneuvering clearances have to fit into the vestibule alongside this circle.
- The circle is not an accessible route. Wheelchair users, strollers and anyone with a service animal use the adjacent door, which needs clear floor space on both sides and the approach clearances for its swing — planned as part of the entry rather than squeezed in after the drum is located.
- Plan area says nothing about what happens above and below it. The canopy carries the drive, the controls and the drum ceiling, so it needs a supported header and a soffit depth to hide it, and the floor takes a recessed pivot ring or threshold detail that has to be set into the slab before the finish goes down.
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 · v1.0.1
Regulatory standards & verification citations1
- Footprint area = π × (Door Diameter ÷ 2 + Clearance)² — the standard method for estimating the circular floor space a revolving door assembly (drum, wings, and enclosure) requires, including a surrounding clearance allowance from the specific door manufacturer's installation drawings.
Cite this page
Your workspace
Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.