Code Calculations. Instant Answers. No Typing Required.
Dakota Prep apps are used by over 20,000 students from over 80+ apprenticeship organizations & colleges
An app built for the jobsite. Electricians don't have time for complicated interfaces.
Just speak your calculation and get immediate answers.
Example prompts shown:
"What size conductor do I need for a 60 amp circuit?"
"Calculate voltage drop for 200 feet of 12 AWG copper at 120 volts"
"Size a circuit breaker for a 5 HP three-phase motor at 480 volts"
Circuit Calculations
Size conductors, breakers, and raceways for any branch circuit or feeder. Includes automatic voltage drop calculations and equipment grounding conductor sizing.
Try Circuit Calculator ->
Load Calculator
Complete dwelling unit load calculations following NEC Article 220. Size service conductors and calculate demand loads for residential installations.
Try Load Calculator ->
Conduit Fill
Determine minimum conduit size based on conductor count and type. Supports all common conductor insulations and raceway types per NEC Chapter 9.
Try Conduit Calculator ->
Transformer Calculator
Complete primary and secondary sizing for single-phase and three-phase transformers. Includes protection, conductors, bonding jumpers, and raceways.
Try Transformer Calculator ->
Motor Calculator
Get proper breaker and fuse sizing for single-phase and three-phase motors from 1/6 HP to 10 HP. Includes conductor sizing and both breaker and fuse options.
Try Motor Calculator ->
Voltage Drop
Three specialized calculators: find minimum conductor size for a given length, calculate maximum circuit length for a conductor size, or determine actual voltage drop percentage.
Try Voltage Drop Calculator ->
Cooling & Heat Pump Calculator
Size circuits for air conditioning or heat pump equipment using nameplate MCA and MOCP values. Handles single-phase and three-phase systems.
Try Cooling & Heat Pump Calculator ->
Resistive Heating Calculator
Calculate circuits for electric heating equipment including baseboard heaters and unit heaters, based on nameplate ratings. Handles single-phase and three-phase systems.
Try Resistive Heating Calculator ->
Get instant, code-compliant answers with voice commands—no typing, no dropdowns, no hassle.
