Energy Calculators

A collection of calculators and converters for energy efficiency and calculating energy costs.

Calculate the electricity cost and power usage of your home devices and electrical appliances.

Find out how much money and energy you can save by switching your regular light bulbs to LED light bulbs.

Convert between lumens and watts for a variety of different types of lightbulb.

Convert between watts and lumens to calculate the brightness capacity of your lightbulb.

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Construction features

From abacus to iPhones, learn how calculators developed over time.