PoE Budget Calculator for Network Switches
Pick the switch, type how many devices of each PoE class you will plug in, and see how much of the switch's PoE budget is left. Every figure is the maker's own, with the document it came from.
PoE budget: 370 W
Source: Cisco Catalyst 2960-X and 2960-XR Series Switches Data Sheet, Cisco (Updated November 5, 2021; Table 2. Cisco Catalyst 2960-X and 2960-XR Series PoE and PoE+ power capacity, row Cisco Catalyst 2960X-24PD-L, column "Available PoE power (single PS source)"). Cisco Catalyst 2960X-24PD-L 12 ports up to 30W 24 ports up to 15.4W 370W
The maker's note: Intelligent power management allows flexible power allocation across all ports.
| Class | Standard | Watts at the port | Devices | Watts reserved |
|---|---|---|---|---|
| Class 0 | IEEE 802.3af (PoE) and IEEE 802.3at (PoE+) | 15.4 W | ||
| Class 1 | IEEE 802.3af (PoE) and IEEE 802.3at (PoE+) | 4.0 W | ||
| Class 2 | IEEE 802.3af (PoE) and IEEE 802.3at (PoE+) | 7.0 W | ||
| Class 3 | IEEE 802.3af (PoE) and IEEE 802.3at (PoE+) | 15.4 W | ||
| Class 4 | IEEE 802.3at (PoE+) | 30.0 W | ||
| Class 5 | IEEE 802.3bt (PoE-bt) | 45.0 W | ||
| Class 6 | IEEE 802.3bt (PoE-bt) | 60.0 W | ||
| Class 7 | IEEE 802.3bt (PoE-bt) | 75.0 W | ||
| Class 8 | IEEE 802.3bt (PoE-bt) | 90.0 W |
- Budget
- 370 W
- Reserved by 0 devices
- 0 W
- Left
- 370 W
Class watts: Understanding PoE on EX Series Switches, Juniper Networks (web page, no revision printed; Table 2: Class of Powered Device and Power Levels). Maximum Power Delivered by PoE Port
The maker's note: Powered devices that are not IEEE-compliant might not present a class signature. These will be assigned a default class of 0.
How it works
The budget is the total power the switch's maker says it can send to its PoE ports. Where the budget depends on how many power supplies are fitted, each is its own entry in the list.
Each device is counted at the most the switch sets aside at the port for the device's class: the maker's "Maximum Power Delivered by PoE Port". The device itself draws less at its end of the cable; the maker's table gives that range beside each class.
A device that does not announce a class is counted as class 0, as the maker's note says. The class of an access point, phone or camera is in that device maker's own data sheet.
Sources
- Cisco Catalyst 2960-X and 2960-XR Series Switches Data Sheet, Cisco (Updated November 5, 2021). Table 2 (PoE and PoE+ power capacity); Table 4 (2960-X Series configurations); Table 13 (performance); Table 15 (mechanical specifications); Table 21 (Power consumption)
- EX2300 Switch Hardware Guide, Juniper Networks (Published 2025-08-12). EX2300 Switches Hardware Overview (guide pages 5 to 9 and 14); Table 3: Physical Specifications of the EX2300 Switch Chassis; Table 14: Power Consumed by EX2300 Switches
- EX3400 Switch Hardware Guide, Juniper Networks (Published 2026-01-09). EX3400 Switches First View; Front Panel of an EX3400 Switch; Table 3: Physical Specifications of the EX3400 Switch Chassis; Table 11: Power Consumed by EX3400 Switches
- EX4300 Switch Hardware Guide, Juniper Networks (Published 2025-08-12). 24-Port and 48-Port EX4300 Switches; Table 8 (shipped components); Table 10 (physical specifications); Table 32 and Table 34 (N+0 AC power calculations)
- Brocade ICX 6610 Switches Data Sheet, Ruckus Wireless (Brocade ICX) (Copyright 2017 Ruckus Wireless, Inc.; 17-8-C). Brocade ICX 6610 Feature and Model Comparison (page 6)
- RUCKUS ICX 7150 data sheet, CommScope (RUCKUS Networks) (PA-114000.5 (11/25)). RUCKUS ICX 7150 Product Series (page 4); RUCKUS ICX 7150 Feature/Model Comparison (pages 6 and 7); ordering information
- Ruckus ICX 7250 Switch Hardware Installation Guide, Ruckus (ARRIS) (Part Number 53-1003898-08, Publication Date 25 January 2019). TABLE 2 ICX 7250 models (page 13); Power supply usage, TABLE 7 (pages 20 and 21); Weight and physical dimensions (pages 96 and 97); Power consumption (maximum configuration) (page 100)
- RUCKUS ICX 7450 Switch Data Sheet, RUCKUS Networks (CommScope) (PA-113849.2-EN (05/22)). RUCKUS ICX 7450 Feature/Model Comparison (pages 6 and 7)
- Understanding PoE on EX Series Switches, Juniper Networks (web page, no revision printed). Table 2: Class of Powered Device and Power Levels
Checked against the makers' documents on November 5, 2026.