How Many WiFi Access Points Do You Need? AP Placement & PoE Power Planning
Buying the right access point is half the job — placing the right number of them and powering them correctly is the other half. Here is how to estimate AP count by square footage and density, where to mount them, and which PoE standard (802.3af/at/bt) each WiFi generation needs.
TL;DR — count, place, power
- How many? Rough planning: one AP per ~2,500 sq ft in an open office (fewer in homes/open-plan, more in dense or walled spaces). Capacity (device count) often drives AP count more than coverage.
- Where? Ceiling-mounted, centered over the coverage area, with overlap between APs for seamless roaming.
- Power? 802.3af (15.4W) powers most 2x2 WiFi 6 APs; 802.3at / PoE+ (30W) for 4x4 WiFi 6 and many WiFi 6E APs; 802.3bt (60-90W) for high-end WiFi 6E/7 with multiple radios.
This is the planning the WiFi 6 AP buying guide and WiFi 6 vs 6E vs 7 comparison lead into.
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Estimating AP count
Two factors, take the larger:
- Coverage — roughly 1 AP per 2,000-2,500 sq ft in a typical office; tighter (1,000-1,500 sq ft) where there are lots of walls, or wider in open warehouses.
- Capacity (density) — a single AP comfortably serves a few dozen active clients. A 200-seat office is a density problem, not a coverage problem — you may need more APs than square footage alone suggests.
High-density spaces (lecture halls, conference centers, stadiums) are planned by client count per AP, often with lower transmit power and more APs packed closer.
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Placement rules that actually matter
- Ceiling mount, centered over the space — APs radiate down and out.
- Overlap ~15-20% between adjacent APs so clients roam without dropping.
- Avoid obstructions — metal, concrete, elevator shafts, and mirrors kill signal. Don't bury an AP above a drop-ceiling full of ductwork.
- Don't over-power — cranking transmit power to "cover more" causes co-channel interference and sticky-client roaming problems. More, lower-power APs beat fewer, blasting APs.
- Outdoor/warehouse — use APs rated for the environment and the right antennas (omni vs directional).
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PoE: powering your APs
Access points are almost always PoE-powered over the same Ethernet cable that carries data. Match the standard to the AP:
| PoE standard | Power (to device) | Powers |
|---|---|---|
| 802.3af (PoE) | ~15.4W | Most 2x2 WiFi 5 / WiFi 6 APs |
| 802.3at (PoE+) | ~30W | 4x4 WiFi 6, many WiFi 6E APs |
| 802.3bt (PoE++ Type 3/4) | ~60W / ~90W | High-end WiFi 6E / WiFi 7, multi-radio APs |
For three or more APs, power them from a PoE switch rather than individual injectors, and budget the switch's total PoE wattage — a switch rated "370W PoE budget" can't run 24 PoE+ APs at 30W each. See the PoE switch buying guide. (PoE wattage per the IEEE 802.3af/at/bt standards.)
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Don't forget the controller (or cloud)
More than a few APs usually want central management — a wireless LAN controller or a cloud-managed platform (Meraki vs Aruba Instant On vs UniFi) — for roaming, channel planning, and one-pane config.
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FAQ
How many APs for a 10,000 sq ft office? Roughly 4-5 for coverage; more if you have high device density or lots of walls.
Can one PoE switch power all my APs? Only within its PoE budget. Add the per-AP wattage and confirm the switch's total PoE capacity (and use PoE+ ports for hungrier APs).
Ceiling or wall mount? Ceiling, centered, for most indoor APs. Wall-mount only with APs/antennas designed for it.
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Pro Disk Network is an independent reseller of genuine enterprise APs and PoE switches (HPE/Aruba, Cisco/Meraki, Ubiquiti, and others; not affiliated with those vendors). Related: enterprise WiFi 6 AP buying guide · PoE switch guide.
PoE power levels per IEEE 802.3af/at/bt. Coverage/density figures are planning rules of thumb — a site survey gives exact AP counts.