Electrical calculators

Estimate voltage drop for Canadian single-phase, three-phase, and DC circuits.

Estimate maximum one-way conductor length from current, voltage-drop target, material, area, and circuit type.

Estimate copper or aluminum conductor resistance from area, length, and conductor temperature.

Estimate I squared R conductor loss and energy from current, resistance, conductors, and operating hours.

Estimate raceway fill from conductor groups, actual diameters, and a selected fill target.

Screen box-fill volume from marked box volume and user-entered conductor, device, and clamp allowances.

Estimate minimum cable bend radius from outside diameter, multiplier, and layout allowance.

Estimate offset and saddle bend spacing, shrink, and layout length from field geometry.

Estimate support count and average spacing from run length, entered maximum spacing, and end support distance.

Screen pulling tension and sidewall pressure from cable weight, route length, friction, bend radius, and entered limits.

Estimate staggered bend marks for matching offsets across parallel conduits on a rack.

Estimate rigid PVC conduit expansion or contraction from run length and temperature change.

Estimate expansion-joint installed position from travel, temperature range, and installation temperature.

Estimate tray occupied area and fill percent from tray geometry, cable area, count, and an entered target.

Estimate loaded cable reel weight from cable weight per metre, cable length, empty reel weight, and allowances.

Estimate remaining cable length from reel dimensions, cable outside diameter, and packing factor.

Build a multi-row load list and estimate total kW, kVA, and equivalent line current.

Screen entered service size, known demand, proposed loads, and selected headroom.

Estimate phase-current imbalance, average current, and neutral-current screen.

Estimate three-phase voltage imbalance percent from three line-line voltage readings.

Convert balanced three-phase line-neutral and line-line voltages using sqrt(3).

Convert three-phase kW to line current using Canadian voltage presets and power factor.

Convert three-phase line current to kW and kVA using voltage and power factor.

Convert apparent power in kVA to single-phase or three-phase current at common Canadian voltages.

Solve kW, kVA, or line current from one known value, voltage, phase, and power factor.

Estimate kVAR required to improve power factor and compare current before and after correction.

Estimate how line current changes when power factor improves for the same kW and voltage.

Estimate demand-charge impact, correction kVAR, and simple payback from editable CAD inputs.

Aggregate load rows, demand factors, and margin to screen the next standard transformer kVA.

Calculate transformer full-load current on both sides from kVA, voltage, and phase.

Estimate transformer-only secondary short-circuit current from kVA, voltage, phase, and impedance percent.

Compare user-entered available fault current against equipment rating and an optional review margin.

Screen running load, largest starting kVA, margin, and standard generator kVA rating.

Estimate generator L/h, usable fuel, runtime hours, and reserve from load and tank volume.

Estimate charging time from battery size, SOC range, charger kW, and efficiency.

Convert Level 2 EVSE current and charging kW at 208 V or 240 V.

Estimate EV charging session and monthly cost from delivered kWh, CAD/kWh rate, efficiency, and sessions.

Convert amp-hours and voltage into nominal and usable kWh.

Estimate runtime from usable kWh, load watts, inverter efficiency, and reserve.

Estimate inverter AC output current from kW, voltage, phase, and power factor.

Estimate cold PV string open-circuit voltage from module Voc, series count, temperature coefficient, and low temperature.

Estimate DC battery cable voltage drop from voltage, current, length, material, and conductor size.

Estimate maximum one-way PV DC run length from array voltage, current, conductor size, and drop target.

Estimate resistive electric heater current from kW, voltage, and phase.

Estimate duct heater air temperature rise from heater kW and airflow.

Estimate enclosure internal temperature from watts loss, ambient temperature, thermal resistance, and limit.

Adjust conductor resistance from a 20 C base value to an entered conductor temperature.

Convert motor horsepower into mechanical kW and watts for schedule review.

Estimate three-phase motor full-load current from horsepower, voltage, efficiency, and power factor.

Estimate single-phase motor full-load current from horsepower, voltage, efficiency, and power factor.

Estimate preliminary VFD input current from horsepower and an editable amps-per-hp factor.

Estimate motor starting kVA and locked-rotor amps from horsepower, voltage, phase, and kVA per hp.

Estimate motor starting voltage dip from entered starting kVA and available short-circuit kVA.

Convert single-phase generator kW to current at 120 V or 240 V with power factor.

Convert voltage drop percent into volts dropped and load-end voltage.

Estimate LED input watts from required lumens, fixture efficacy, and driver allowance.

Estimate required lumens and preliminary LED watts from target lux, area, and light loss factor.

Estimate fixture count from target lux, room area, lumens per fixture, and light loss factor.

Estimate voltage-probe placement for fall-of-potential ground testing from probe distance and percent point.

Estimate equivalent conductor area for matching copper and aluminum resistance.