Voltage Drop Pro vs Voltage Calculator

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).

Voltage Calculator is a fast, focused toolbox for everyday electronics work. Three calculators in one clean, dark interface give you instant answers while you type. KEY FEATURES • Series & parallel calculator: combine up to 15 resistors or capacitors and read the result in every common unit • LED series resistor: enter supply voltage, forward voltage and forward current to get the right resistor and its power rating • Built-in reference table of typical LED forward voltages • Voltage divider: calculate the output voltage, or find the missing resistor for a target output • Live circuit diagrams that show your values in place • Results update instantly in multiple units as you type • Available in 24 languages