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

Energy Calculators

Calculators and converters for energy efficiency.

lightbulb energy saving icon

LED Savings Calculator

Find out how much money and CO2 you can save by switching your regular light bulbs to LED light bulbs.

lightbulb icon

Lumens to Watts Calculator

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

lightbulb icon 2

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 me with your comments on my calculators.

The History of the Calculator

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

Abacus and calculator