PoE Voltage Drop Calculator — Cat5e/Cat6/Cat6a | WireStandard

Calculate PoE voltage drop for Cat5e (24 AWG), Cat6 and Cat6a (23 AWG) cable. Compare 2-pair vs 4-pair PoE modes for 802.3af, 802.3at and 802.3bt standards.

Cable Type

Cable Length (m)

PoE Standard

PSE Output Voltage (V)

PD Power Consumption (W)

Current (A)

2-Pair Mode

4-Pair Mode

Voltage Drop (V)

Power Loss (W)

PD Received Voltage (V)

Max Safe Distance (m)

Based on IEEE 802.3af/at/bt. Resistivity: copper ρ = 0.0172 Ω·mm²/m. 2-pair: R_loop = ρL/A; 4-pair: R_loop = ρL/(2A). Results are estimates — verify with cable manufacturer specs.