USB Power Calculator
Calculate USB power delivery, cable voltage drop, and specification compliance.
USB Configuration
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%
💡
Help us improve!
How would you rate the USB Power Calculator?
Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
📚
Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.