Parallel Circuit Resistance Calculator
Two resistors in parallel are easy. Six of them, plus a supply voltage and a per-branch current check, are where hand math starts to slip.
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Recessed Lighting Calculator
How many recessed lights does a room actually need? Too few and you get dark corners; too many and you overpay for fixtures and electricity.
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Ceiling Light Calculator
Most rooms get their ceiling lights by guesswork: a contractor rule of thumb, a grid copied from the showroom, or however many fixtures were on sale.
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Light Calculator
Lighting a room well is a math problem before it is a shopping problem: room area times the target brightness for the room’s use gives total lumens, and dividing by each bulb’s lumens tells you how many bulbs to buy.
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KW To Amps Calculator
Converting kilowatts to amps is one of the most common electrical calculations, and the formula changes with the current type.
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Phasor Calculator
A phasor is a complex number that stands in for a sinusoidal signal: its magnitude carries the amplitude and its angle carries the phase.
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Demand Charge Calculator
For commercial and industrial electricity customers, the demand charge is often the largest single line on the bill, and it has nothing to do with how much energy you used.
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Electric Panel Cost Calculator
What does a new electrical panel cost? Mostly, it depends on amperage and on how much work rides along with the panel itself.
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Rewire Cost Calculator
A rewire cost calculator turns three numbers, your home’s square footage, a per-square-foot rate, and any extra charges, into a full estimate with a price check.
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Gas Lantern Cost Calculator
A gas lantern’s charm comes with a running cost, and that cost depends on three things: what fuel it burns, how fast it burns it, and what the fuel costs where you live.
16 tools