Light String Calculator

Rudolph's Christmas Tree Light String Calculator!

The number of light strings you might need for your sparkly-glittery-fancy-PREFECT Christmas tree depends a lot on personal preference. The recommendations provided here assume that you just LOVE an evenly spaced distribution of your lights both vertically and horizontally throughout your tree - at either 4" spacing or 6" spacing between bulbs.

The most common spacing for indoor Christmas trees is 4". Some folks prefer 6" - and some of our specialty light strings, like our SuperSpark and QuadSpark 5mm strobe light strings, are only available with 6" spacing between the bulbs. So be sure to match the results here (ie 70 bulbs strings with 4" spacing, etc.) to the light strings you are shopping for.

In order to calculate the recommended number of strings for YOUR tree, you need to know its height and its bottom width. Select the closest option in the drop down boxes below (tip: the bottom canopy width of most Christmas trees is about 50% of it's height) - and BAM! The number of strings of our 4 most popular light string configurations will appear like magic! 

Step 1 — Enter Your Tree Dimensions

Step 2 — Your Results

String Configuration Strings Needed Total Bulbs

✓ All counts rounded up — so you always have enough to complete your display.

💌 Email My Results

Calculator Help

Frequently Asked Questions

Quick answers for tree-light counts, spacing, and string selection.

How many light strings do I need for my Christmas tree?

It depends on the tree height and bottom canopy width. A standard 7-foot tree with a 4-foot canopy typically needs 7–10 strings of 100-count lights at 4-inch spacing for full coverage.

What is the difference between 4-inch and 6-inch bulb spacing?

Four-inch spacing creates denser light coverage and a more saturated glow, while six-inch spacing creates a more open look and is useful on larger trees.

Should I use LED or incandescent lights on my Christmas tree?

LED wins on almost every practical metric: lower heat, lower energy use, and much longer life. Modern warm-white LEDs also look much closer to incandescent than older generations did.

What type of Christmas light string works best for tree wrapping?

For wrapping trunks, branches, and topiary-style trees, 5mm wide-angle LED strings are usually the best choice because they sit close to the surface and throw light in every direction.

How do I evenly distribute lights on a Christmas tree?

Start at the top and work down, weaving the string in and out along each branch layer instead of just spiraling around the outside.

Can I mix different light types on the same tree?

You can, but be intentional. The cleanest approach is usually combining steady-burn strings with a few specialty strings while matching wire color and bulb spacing.

We help you create smiles in the moment and memories that last a lifetime.

Smiles + Joy + Memories = Hope

This is the equation we absolutely live by every single day. We know that Christmas decorating makes people smile and brings pure joy while creating memories that last forever. These combined effects give people hope, and honestly, that's what it's all about. Lighting is pure magic—it's the twinkle in the eyes of people of all ages that makes everything worthwhile. THAT is what we call hope with a capital H!

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