FREE ONLINE TOOLFree Voltage Drop
Free Voltage Drop
Calculator
Free advanced Voltage Drop Calculator for DC, single-phase AC and balanced three-phase AC with copper/aluminum conductors, AWG/kcmil/mm² sizes, temperature-adjusted resistance, custom cable R/X, exact phasor check, minimum-size planning and maximum-distance planning.
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About Free Voltage Drop Calculator
Calculate drop, plan a minimum conductor size, or find a maximum one-way run. Use copper or aluminum with temperature-adjusted resistance, AWG/kcmil or metric sizes, parallel conductors, or enter a cable datasheet's R/X directly for a power-factor-aware AC phasor check.
Workspace options
- System
- Source / nominal voltage
- Power factor
- Parallel conductors / phase
- Load current
- Real load power
Available actions
- Voltage drop
- Minimum size
- Maximum distance
- Known current
- Known real power
- Material + size