A while back I wrote and article about how to calculate the energy savings of LED Christmas lights.  The article I wrote describe the formula and included a link to some other resources.  We recently developed a calculator that does all the work for you.  All you have to do now is enter the various data and outcomes your answer.  In addition to calculating the cost and energy savings of using LED Christmas lights the calculator can also help you determine how many Christmas or holiday lights you should have for your tree.

If you like doing math feel free to follow the directions in my previous article–otherwise just try this Christmas light calculator.