Conductors & Raceway
Conductor Sizing & Voltage Drop
Compare conductor ampacity and estimate voltage drop on branch circuits and feeders.
Not sure where to start? Choose by task and required inputs.
Conductor Ampacity CalculatorApply ambient and conductor-count corrections.Branch Circuit Conductor and Breaker CheckCompare general-load requirements with a conductor and breaker.Copper vs Aluminum Wire Cost CalculatorCompare user-entered material and termination costs for two conductor alternatives.Feeder Conductor Sizing and Voltage Drop CalculatorFind the smallest listed feeder conductor meeting ampacity and voltage-drop targets.Voltage Drop and Wire Size CalculatorEstimate circuit voltage loss and compare listed conductor sizes.Wire Resistance CalculatorEstimate one-conductor and current-path resistance from material, conductor size, length, and temperature.Wire Power Loss CalculatorEstimate I-squared-R conductor losses and annual energy cost for single-phase or balanced three-phase circuits.Parallel Conductor Sizing CalculatorEstimate per-set current and voltage drop for identical parallel conductors.Feeder and Branch Circuit Voltage Drop CalculatorSum estimated voltage drop through feeder and branch-circuit segments using separate load and conductor inputs.
Which tool fits your task?
Separate current-carrying capacity, voltage loss and circuit protection. Start with the question you need to answer, then use the remaining tools for their separate checks.
| Your task | Inputs to collect | Tool and scope |
|---|---|---|
| Apply conductor ampacity corrections | Material, insulation/termination assumptions, ambient temperature and conductor count. | Conductor Ampacity Calculator A corrected ampacity is not a voltage-drop result or complete circuit selection. |
| Estimate voltage loss or compare wire sizes | Current, circuit voltage, route length and conductor information. | Voltage Drop and Wire Size Calculator Voltage-drop performance alone does not establish ampacity or protection suitability. |
| Compare feeder ampacity and voltage-drop conditions | Feeder current, route and supported conductor/installation assumptions. | Feeder Conductor Sizing and Voltage Drop Calculator Review both result criteria and the stated parallel-conductor limitations. |
| Compare a general branch load, conductor and breaker | Load details, conductor conditions and entered breaker rating. | Branch Circuit Conductor and Breaker Check Equipment-specific and adopted-code conditions still require their own review. |