The calculator tool below is designed to give an approximate number for trees. When figuring out how many lights you need for a tree, it can be a daunting task trying to guesstimate how many you need. Often, more are needed than you think. By calculating the width at the top and bottom of the tree, we can calculate the average diameter, figure out the circumference, and multiply that by the height of the tree divided by the spacing you want. Use the form below to find the average amount of lights you will need for your tree!