Electrical

• Voltage Drop CalculatorEstimate the voltage drop over a single-phase or three-phase cable run, as an absolute value, a percentage of nominal voltage, and the voltage arriving at the load.
• Cable Run Length CalculatorEstimate how much cable to buy for a wiring run — net length, length with slack, length with waste, and how many coils to buy.
• Socket and Switch Count CalculatorDerive socket count, switch count, and circuit count from a real list of appliances and fixed points placed on the room's own walls — not from floor area alone.
• Lighting CalculatorEstimate luminaire count for a room using the lumen method from a target illuminance level.