Popup calculator Copy a link to this page Print this page Email a link to this page Scroll up to form What does this mean? Remove this row Open/Close content Close content Return to content Copy to clipboard

Energy Calculators

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.

MPGe Calculator

Calculate the efficiency of your electric vehicle and find out how much it costs to power your journey.

Watts to Lumens Calculator

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

Comments and Suggestions?

Please feel free to contact us with your comments on our calculators.

The History of the Calculator

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