Tree strand count
Estimate mini-light strands for wrapping a tree from height and wrap density (feet of lights per foot of height).
total_light_feet = tree_height × wrap_density · strands = ceil(total_light_feet ÷ strand_length)
When to use
Use this page when you need a transparent tree strand count estimate before you buy décor or hang lights in Prince William County. You will enter tree height (feet), wrap density (light-feet per height-foot), strand length (feet), and number of similar trees.
Estimate mini-light strands for wrapping a tree from height and wrap density (feet of lights per foot of height). Read the formula and worked example so the number is arithmetic you can check — not a guess from last year.
If a product package publishes its own coverage chart, keep that chart in the loop — this tool is the independent check.
Light-feet, not bulbs: ~25 airy, ~35 classic (about 100 mini bulbs per height-foot at 4-in spacing), ~50–70 dense.
Worked example
Example defaults: tree height 8 ft, wrap density 35 light-ft per height-ft, strand length 25 ft, trees 1.
Light feet per tree = 8 × 35 = 280 ft. Total = 280 × 1 = 280 ft. Strands = ceil(280 ÷ 25) = ceil(11.2) = 12.
Density is a style choice — start lower outdoors only if the tree already reads bright from the curb.
Bulbs per foot vs. light-feet per foot
Tree lighting advice is usually given in bulbs per foot of height — about 100 for a classic look, 150 for full, 200 for very bright. This calculator works in feet of lit strand instead, because strands are sold by length. To convert, multiply bulbs by bulb spacing: 100 bulbs × 4 in = 400 in, or about 33 light-feet per height-foot. At 6-in spacing (common on wide-angle LED sets), 100 bulbs is 50 light-feet.
Example: a 7.5-ft tree at 150 bulbs per foot is 1,125 bulbs. With 100-bulb sets at 4-in spacing (33 ft each), that is ceil(1,125 ÷ 100) = 12 sets, or 7.5 × 50 = 375 light-feet. Enter 50 for density and 33 for strand length and the calculator returns the same 12.
Outdoor evergreens in a Prince William County front yard are usually viewed from 40 ft or more, so they need a denser wrap than an indoor tree to read from the street. A 6-ft porch evergreen at 50 light-feet per foot needs 300 ft — ten 30-ft sets — while the same tree indoors looks finished at about 35 (210 ft, seven sets).
Limits / assumptions
Assumptions: inputs match the hints (measured eaves, nameplate watts, package strand length, and so on). Terms not named in the formula are not secretly included.
Limits: outdoor weather, GFCI trips, and real stock sizes vary. Prefer outdoor-rated cords and clips; ladder and roof work need their own safety practices.
Responsibility: confirm safety-critical electrical and height decisions with manuals and, when needed, a qualified professional. PWC Lights does not stamp displays.
FAQ
What wrap density should I use?
A classic look is about 100 mini bulbs per foot of tree height. At 4-in bulb spacing that is about 33–35 light-feet per height-foot; go to 50–70 for a dense, curb-visible outdoor evergreen.
Does trunk wrapping use the same math?
Roughly — measure the lighted height and pick a denser wrap if you spiral tightly.
Should strands be end-to-end?
Stay within the manufacturer’s max connections and outlet load; split feeds on large trees.
What about bush nets instead?
For shrubs, try the bush net count calculator instead of spiral wraps.