PoE Budget Calculator.
Count the PoE-powered devices on the network — phones, cameras, APs, intercoms, sensors, AV nodes — and the tool sizes the switch PoE budget, the correct IEEE 802.3 class, and the SKU band. 30% headroom built in.
- PoE classes
- af · at · bt
- Headroom
- 30%
- Switch tiers
- 6
- SKU bands
- Aruba · Cisco · NETGEAR
Recommended budget
125 W
96 W draw + 30% headroom
Devices counted
8
across all PoE classes
Switch tier
24-port
24-port unmanaged PoE+
Indicative SKU band
₹ 35,000
per-unit list (excl. GST)
Recommended platform
24-port unmanaged PoE+.
NETGEAR GS324P · TP-Link TL-SG1024P
PoE budget is a shared pool
A 48-port PoE+ switch with 740 W cannot drive 30 W per port simultaneously — only about twelve ports can be fully loaded.
Wi-Fi 7 needs PoE++ Type 3
Wi-Fi 7 APs and heated PTZ cameras both draw above 25 W. PoE+ at 30 W per port is on the edge; Type 3 at 60 W is the safe specification.
30% headroom is the rule
Five-year refresh cycles see device counts grow about 6% a year. 30% spare keeps the switch in budget across the cycle.
Stack above 1,800 W
A single chassis tops out at ~1,800 W in most enterprise-tier switches; beyond that, stack two or move to a chassis with dual PSUs.
Indicative figures. Final BOM derives from cable run lengths (long runs derate per IEEE 802.3bt PSE-to-PD efficiency), VLAN segmentation, redundancy requirements and PSU sizing — every PoE network we design ships with a per-port budget allocation spreadsheet.
· Why budget right matters
A 48-port switch advertised as PoE+ does not deliver 30 W on every port. The PoE budget is a shared pool: a 740 W budget split across 48 Wi-Fi 6 APs at 18 W draws 864 W — over budget by 124 W, which means some APs power-cycle under load. Sizing the PoE budget against the actual device draw at design time, with 30% spare, is the difference between a network that runs and one that visits the rack at 3 a.m.
· Frequently asked
PoE Budget —
what people ask first.
What is a PoE budget?
A switch's PoE budget is the total watts it can deliver to powered devices across all ports combined. A 24-port PoE+ switch with a 380 W budget cannot supply 30 W on every port simultaneously — only ~12 ports can be fully loaded. Sizing the budget against actual device draw plus headroom is the correct planning method.
When do I need PoE++ Type 3 vs Type 4?
Type 3 (60 W cable / 51 W device) is needed for Wi-Fi 7 APs, large 1080p PTZ cameras with heater, small kiosk displays and some AV-over-IP encoders. Type 4 (90 W / 71.3 W) is reserved for video-bar systems, large pan-tilt-zoom-heated outdoor cameras, and powered displays up to 12 inches. Most enterprise networks today are predominantly Type 3.
Why 30% headroom?
Five-year refresh cycles see device counts grow ~6% per year and per-device draw increase as Wi-Fi standards advance. A 30% spare keeps the switch in budget over the cycle without forcing an early replacement. Beyond 30%, the cost premium of an over-sized switch tier is rarely justified.
Does the tool account for cable-length losses?
It uses the device-side wattage (after PSE-to-PD efficiency losses). For runs near the 100 m limit, derate the device draw by ~5% as a conservative buffer. Most premium installs land at 30–60 m runs where loss is negligible.
Will TechnoGuru spec the switch and install it?
Yes. Enterprise switching, structured cabling and PoE network design are core services. We specify Cisco, HPE Aruba and Juniper enterprise classes, with NETGEAR M-class as a value-tier alternative for SMB. End-to-end commissioning with link-budget testing on every PoE run.
· Begin
Planning a PoE network
for a large building?
Send the BOQ of PoE devices, building floor plate and cable routing intent. We will return a switch BOM with PoE budget headroom and rack elevation within two working days.