How Many Lights Should You Put On Your Christmas Tree?

How many lights do you need for your Christmas tree? We've developed a free and simple calculator below to give you a quick and easy answer based on our decades of experience both stringing the trees in our store and helping our customers get lights for their trees. The answer you'll get from our Christmas Light Calculator™ will be perfect for most customers, but if you prefer different numbers of lights compared to most people please see our recommendations below the calculator.

Want to know how many ornaments to put on your tree? Find out with our Christmas Ornament Calculator™.

Christmas Light Calculator™

How many feet of light strings should I put on my tree*?


Christmas Tree Height in Feet (e.g., 7.5):

Christmas Tree Base Width in Feet (e.g., 4):

Recommended Feet of Light String:

*Our Christmas Light Calculator™ works for both residential and commercial Christmas trees and lights. The calculation is based on standard 6" LED mini light spacing or 12" LED C7/C9 light spacing. Please see our Christmas lights for all your options.



The Perfect Number of Lights

The recommended feet of light string from our Christmas Light Calculator™ is based on what our average customer has felt is a perfect number of lights for their tree. Keep in mind that the result is not for the number of lights, but for the number of feet of light string you should use. This is based on light strings where mini lights are spaced at 6 inches apart, or C7 lights are spaced at 12 inches apart. For mini lights the actual number of bulbs will be 2x the recommended feet of light string, and the for C7 lights the actual number of bulbs will be the same as the recommended feet of light string.

What if my light strings have different spacing?

If your light strings have different spacing, 4 inches between mini lights for example, then you can simply use the number of bulbs instead of the number of feet of light string. To get the number of bulbs for mini lights simply multiply the result of our calculator by 2, and for C7 lights the recommended number of bulbs will be the same as the result you see.

What if I want fewer lights than most people use on their tree?

If you tend to like less lights on your Christmas tree than most people, you can change the recommended number from our calculator. For example, if you think you prefer only 50% of the lights that most people use, you can multiply the result of our calculator by .5. If you think you prefer to have 80% of the lights that most people use, you can multiply the result by .8.

What if I like more lights than most people?

If you know you like more lights than most people use on their Christmas tree, you can also add to our recommended number. If you want 50% more lights than most people use, then you can multiply the result of our calculator by 1.5. If you want double the number of lights that most people use, then you can multiply the result by 2.

I'm still not sure how many lights I should use!

If you have any questions or are still uncertain please feel free to send us an email or give us a call. We're happy to help!



If you have questions about the energy use of your lights, please use our energy calculators below:

Christmas Light Energy Calculators

How many watts can I use per circuit*?


Number of amps my circuit is rated for*:

Watts per circuit:

*Please consult a licensed electrician before you begin any lighting projects. You can find out how many amps your circuit(s) are rated for by looking at the number on your circuit breaker. Most circuits are rated for either 15 or 20 amps. The above calculator assumes 80% of the total capacity for safety. It is also important to know how many outlets are on one circuit. You can determine this by making note of which outlets stop functioning when you switch a circuit off.


How many watts are my light strings*?


Number of bulbs on each light string*:

Number of watts per bulb*:

Watts per light string:

*The packaging your lights came in should have either the total watts of the string or the number of bulbs and watts per bulb.


How many strings can I put on one circuit*?


Number of watts available on my circuit (see answer #3):

Number of watts per string (see answer #4):

Strings per circuit:

*This tool provides you with the maximum number of light strings you should put on one circuit. It does not tell you how many light strings you can connect together. Generally you should not connect more than three 50' incandescent strings end to end. You can connect a larger number of LED Christmas lights together since they use 90% less power. Please see the packaging on your LED lights for more information.


How many bulbs can I put on one circuit?


Number of watts available on my circuit (see answer #3):

Number of watts per bulb*:

Bulbs per circuit:

*The number of watts per bulb should be found on the packaging your lights came in.


How many amps does each light string/item require*?


Number of watts per light string/item (see answer #4):

Amps per light string:

*Be sure your light strings and extension cords are rated for sufficient amperage.