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USB Cable Voltage Drop & Power Loss Calculator
Estimate voltage drop, power loss, and maximum recommended cable length for USB cables based on cable type, current, voltage, length, and conductor AWG.
Input Parameters
Results
Equations Used
Voltage Drop: Vdrop = I × R_total (R_total = R_per_meter × Length × 2)
Power Loss: P = Vdrop × I
Resistance per meter is based on AWG:
28 AWG ≈ 0.213 Ω/m, 26 AWG ≈ 0.134 Ω/m, 24 AWG ≈ 0.084 Ω/m, 22 AWG ≈ 0.053 Ω/m
Max Length for 5% drop: Lmax = (V × 0.05) / (I × R_per_meter × 2)
Frequently Asked Questions (FAQ)
Q1: Does cable length affect USB power delivery?
A: Yes, voltage drop increases with length and can reduce device performance.
Q2: Can I use a thicker conductor to reduce drop?
A: Yes, lower AWG reduces resistance and voltage drop.
Q3: Does the USB type affect voltage drop?
A: Yes, USB 3.x / USB-C cables typically use thicker power conductors and can handle longer distances with less drop.
