LectriCalc for Windows
by Arkansoft

  Also available for Palm and PocketPC handheld comptuers.
Tells electrical voltage drop over distance, both for AWG and metric cables.

Find cost to run lights and equipment per day, week, month and year.

Calculate amperage and wattage data.

Find DC, AC single and 3-phase Kilowatts when amps, voltage & power factor is known

Find single and 3-phase Kilovolt-Amps when amps & voltage is known

Find Single and 3-phase Amps when kVA and voltage is known

Find DC, AC single and 3-phase amps when kilowatts, voltage and power factor is known

Find DC, AC single and 3-phase horsepower output when amps, voltage, efficiency and power factor are known

Find DC, AC single and 3-phase amps when horsepower, voltage, efficiency and power factor is known

Calculate foot candle brightness of light at any distance from a light source.

Reference section includes many handy electrical formulas, tables and diagrams.

Context-sensitive online help.

Color support

Includes Windows version you can conveniently use on your desktop/laptop. Windows version looks and works exactly like the handheld version, so there is no need to learn anything new.
Also see EstiMaker, designed to help electrical professionals with the estimating/bidding process, letting an estimator create a take-off estimate in, generally, at least a third of the usual time.

Related software:
electric, electrical, electrician, calculator, calculate, light, outdoor, landscape, voltage, drop, ...