A collection of calculators and converters for energy efficiency and calculating energy costs.
Electricity Cost Calculator
Calculate the electricity cost and power usage of your home devices and electrical appliances.LED Savings Calculator
Find out how much money and energy you can save by switching your regular light bulbs to LED light bulbs.Lumens to Watts Calculator
Convert between lumens and watts for a variety of different types of lightbulb.Watts to Lumens Calculator
Convert between watts and lumens to calculate the brightness capacity of your lightbulb.
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From abacus to iPhones, learn how calculators developed over time.