Coverage vs capacity in a large hall
Take an open hall of 2,700 m². By coverage alone it needs about three access points. Now fill it with 600 attendees. At about one device per person that's around 600 devices, and at about 50 devices per access point the same hall needs around 12. Capacity has quadrupled the count. In a warehouse with a few dozen staff it works the other way round, and coverage decides.
That's why floor area alone is a poor guide for event halls. The questions that matter are how many people, how many are online at the busiest moment, and what they're doing. The event network planner does the arithmetic for both sides, and our guide on how many access points you need explains the method.
How many access points a large space needs
Planning starting points, always confirmed on-site:
| Space and use | Coverage (÷ 900 m²) | Capacity (÷ 50 devices) | Plan around |
|---|---|---|---|
| 1,200 m² hall, 150-person dinner | About 2 | About 3 (150 devices) | Capacity: 3 |
| 2,700 m² hall, 600-person expo day | About 3 | About 12 (600 devices) | Capacity: 12 |
| 4,000 m² shed, 40 staff working | About 5 | About 2 (60–80 devices) | Coverage: 5 |
| 1,800 m² open-plan floor, 120 staff | About 2 | About 4–5 (180–240 devices) | Capacity: 4–5 |
Devices: about 1 per attendee and 1.5–2 per working person. At public events fewer devices are active at once, which we factor in once we know the run sheet.
Where access points go in a big open room
Placement matters as much as numbers. We use business-grade access points for dense halls and follow four rules:
Above the crowd
On stands, trusses or high points the venue allows, so bodies don't block the signal. People absorb WiFi, and a full hall behaves very differently from the empty one we walked through.
Spread out, not clustered
Spacing access points across the floor shares the load. Several units stacked near the stage only serve the people closest to them.
Turned down, not up
In a dense room, lower power per access point creates smaller cells, so each one serves its own patch instead of shouting over its neighbours.
Cable where the work happens
Registration, the stream position, the stage and payment points get wired connections, so the busiest devices aren't competing on WiFi.
Send a floor plan or the venue name. We reply with what the network needs and one written quote.
Interference in large open spaces
With no walls, every access point can hear every other one. Put a dozen on the same few channels and they spend their time waiting for each other. The fix is channel planning: spreading access points across the available channels, favouring 5 GHz and 6 GHz where devices support them, and keeping 2.4 GHz to a minimum because it has only a few non-overlapping channels.
Exhibitors and visitors bring their own hotspots, phones and wireless gear, and you can't switch those off. We check the airwaves when we test, and if the venue's own WiFi runs in the same space, we plan around it or agree with the venue which network does what. The trade show WiFi interference guide explains this in more depth.
Before planning WiFi for a large space
- Floor plan with dimensions, stage, and seating or stand layout
- Peak headcount and when it happens
- What must work: registration, payments, streaming, exhibitors, guests
- Venue rules on outside equipment and mounting points
- Whether the venue's own WiFi will be running during the event
- Where power is available on the floor
- Bump-in and bump-out times
Questions people ask
How many access points does a large hall need?
A large hall needs whichever is higher of two estimates: floor area divided by roughly 900 m² for coverage, and expected devices divided by about 50 for capacity. A 2,700 m² hall with 600 attendees needs about three for coverage but around 12 for capacity, so capacity decides. The final number is confirmed on-site.
Why does WiFi get slow when a hall fills up?
WiFi gets slow when a hall fills up because each access point shares its capacity among every connected device, and people's bodies absorb signal. Hundreds of phones joining at once, plus nearby access points on the same channels, means more waiting and retries. Planning for the busiest moment rather than the empty room avoids it.
Is mesh WiFi suitable for a large open hall?
Mesh WiFi suits a large open hall when headcount is modest and setup speed matters, because nodes only need power. For a crowded hall, cabled access points usually do better, since wireless backhaul shares the airwaves with users and dense crowds need every bit of capacity. Our mesh vs access points guide compares them.
Should we turn off the venue's own WiFi?
Whether to turn off a venue's own WiFi depends on the venue's rules and what else relies on it. Two networks in the same open space compete for channels, so it helps to agree which does what: the venue network for its own systems, the event network for staff, payments and guests. Some venues require their in-house network to be used.
Can you provide WiFi for empty warehouses used as event spaces?
Yes. Empty warehouses and sheds used as event spaces are a common large-space job. They combine warehouse problems, such as steel walls and no internet, with event problems, such as a dense crowd for a few hours. Our warehouse WiFi page explains how steel and height affect coverage.
