Free Christmas Tree Size Calculator (What Size Tree Do I Need?)


Vintage watercolor living room with a tall decorated Christmas tree, a measuring tape and wrapped gifts

What size Christmas tree fits your room? This free Christmas tree size calculator tells you the tallest tree you can buy for your ceiling height, after leaving space for the tree topper and the stand. Type your ceiling height, choose your topper and stand, and get the tree size to buy, the approximate width of the tree and the floor space to allow. It works on phone and computer and needs no sign-up.

Christmas 2026

What Size Christmas Tree Do I Need?

Tell me your ceiling height. Get the tallest tree that fits and the size to buy.

1. Your room

Tips for choosing a tree

  • Measure the ceiling in the exact spot where the tree will stand.
  • Leave a few inches of space above the topper so it does not touch the ceiling.
  • Check the height on the tree label and compare it with the number above before you buy.
  • Measure the width of your space too, and keep the tree away from heaters and fireplaces.

More for your Christmas

How it works: the calculator takes your ceiling height and subtracts the height of the stand, the height of the topper and 4 inches of space above it. The result is the tallest tree that fits, and it is rounded down to the nearest standard size: 3, 4, 4.5, 5, 6, 6.5, 7, 7.5, 8, 9, 10 or 12 feet. The width is estimated at about two thirds of the height.

Also useful: the Christmas countdown checklist, the Christmas gift ideas generator and the Christmas dinner calculator.

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