Voltage Drop Pro - Electrician

NEC voltage drop calculator for branch & feeder circuits. Copper or aluminum, any AWG. Instant PASS/FAIL against 3% and 5% limits. Works offline.

Voltage Drop Pro calculates voltage drop per NEC 2023 Article 210.19 and 215.2 — the code sections that determine if your conductor run keeps voltage drop within acceptable limits.

Works offline. No subscription. One-time purchase.

WHAT IT CALCULATES

• Branch circuits (210.19) and feeders (215.2)
• Copper (K=10.4) and aluminum (K=17.0) conductors at 75°C
• All wire sizes — 14 AWG through 500 kcmil
• System voltages from 120V to 480V

VERDICTS BACKED BY CODE Compares your voltage drop percentage against the NEC-recommended 3% branch/feeder max and 5% combined max. Get an instant PASS or FAIL — with the actual voltage drop, margin, and wire data shown.

BUILT FOR THE FIELD No ads. No cloud. No account required. Designed for electricians who need the answer in seconds, not after a signup flow.

PART OF THE FIELDMETRIC SUITE Also available: Box Fill Pro (NEC box fill) and Conduit Fill Pro (NEC conduit fill calculations).