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Christmas Tree Size Calculator

Enter your ceiling height and room size. Get the exact tree height, base width, lights, and ornament count to buy.

Ceiling height (ft)

Average US ceiling is 9 ft. Cathedral ceilings can hit 12–18.

Room minimum dimension (ft)

The shorter of the two — width or depth.

Tree shape

Your tree

8 ft

4.8-foot base · standard shape

Lights

~800

8 × 100-light sets

Ornaments

~96

across 3 sizes

Ribbon

32 ft

4 inch width

Topper

12 in

height of piece

Budget low

$320

basic faux + decor

Budget high

$880

premium real or pre-lit

Tree height: ceiling minus 12 inches (room for the topper and lifting power for the stand).
Lights: 100 lights per foot of tree is the industry standard for a well-lit tree — so this tree wants about 800 lights (8 sets of 100).
Ornaments: roughly 12 per foot of tree, split across three sizes (50% small, 30% medium, 20% large).
Ribbon: 4 feet of ribbon per foot of tree, draped loose top-to-bottom in a single line.
Base width: 60% of tree height for standard shapes (45% slim, 75% full).