USB Power Calculator

Calculate USB power delivery, cable voltage drop, and specification compliance.

USB Configuration

USB Standard

Device Current (mA)

Cable Length (m)

Cable Gauge (AWG)

Power Analysis

2.39 W

Device Power

4.79 V

Device Voltage

Status: OK

USB Specification: USB 2.0

Nominal Voltage5 V

Max Current500 mA

Min Allowed Voltage4.50 V

Cable Losses

Cable Resistance425.8 mOhm

Voltage Drop0.213 V

Power Loss106.5 mW

Efficiency95.7%