PoE Power Calculator

Calculate PoE switch power budget and estimate power consumption for IP cameras, access points, VoIP phones, and PoE devices. Easily check PoE capacity, cable loss, remaining power budget, and PoE compatibility online.
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W
Unit
W
%
%
Calculation Result
Total Device Power96.00 W
Estimated Cable Loss9.60 W
Total Power with Loss105.60 W
Recommended Minimum Budget126.72 W
Remaining Switch Budget-6.72 W
Device Compatible with Selected PoE StandardSwitch Budget Insufficient
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Overview

The PoE Power Calculator helps estimate Power over Ethernet (PoE) switch power requirements for IP cameras, wireless access points, VoIP phones, access control systems, and other PoE-powered devices. It calculates total power consumption, cable loss impact, recommended power budget, remaining switch capacity, and compatibility with common PoE standards such as IEEE 802.3af, 802.3at, and 802.3bt.

Common Use Cases

How to Use

1
Select the PoE standard used by your switch or devices.
2
Enter the total PoE power budget available on the switch.
3
Input the number of PoE devices that will be connected.
4
Enter the expected power consumption per device in watts.
5
Configure the estimated cable loss percentage if applicable.
6
Set a safety margin percentage to reserve additional power capacity.
7
Review the total device power consumption.
8
Check estimated cable loss, recommended power budget, remaining switch capacity, and PoE compatibility status.

Example Scenario

IP Camera PoE Deployment

A surveillance installer plans to connect eight PoE-powered IP cameras to a 120W PoE switch. The calculator estimates total power consumption, cable losses, recommended safety margin, and verifies whether the switch has sufficient power capacity.

Technical Notes

PoE switches have a maximum power budget that must be shared across all connected PoE devices.

Total device power consumption is calculated using the number of connected devices multiplied by power usage per device.

Long Ethernet cable runs introduce power loss which reduces the effective power delivered to connected devices.

A safety margin helps accommodate startup power spikes, future expansion, and variations in device power consumption.

Per-port compatibility is evaluated by comparing device power requirements against the maximum power supported by the selected PoE standard.

Remaining power capacity indicates how much additional PoE load the switch can support after current devices are accounted for.

Different PoE standards support different maximum power levels per port and total switch budget capabilities.

Common Mistakes

Frequently Asked Questions

A PoE power budget is the total amount of electrical power a switch can supply to all connected PoE devices combined.

Long Ethernet cable runs introduce power loss, reducing the effective power available to connected devices.

Devices may fail to power on, experience instability, or the switch may disable power delivery on some ports.

A safety margin helps accommodate startup surges, device variations, future expansion, and overall system reliability.

Yes. The calculator supports any PoE-powered device including cameras, access points, VoIP phones, intercoms, and access control equipment.

Related Topics

PoE switch sizingIEEE 802.3afIEEE 802.3atIEEE 802.3btIP camera power planningWireless access point deploymentPoE power budgetNetwork infrastructure designEthernet cable power lossVoIP phone installationCCTV power planningPoE compatibility