Outdoor Lighting Spacing Calculator
Space landscape path lights evenly and size the transformer — fixture count, even spacing and total wattage.
How it works
Fixtures = ⌊length ÷ spacing⌋ + 1 · Even spacing = length ÷ (fixtures − 1) · Transformer ≥ total watts ÷ 0.8
Path lights read best when they are evenly spaced, so divide the run by your target spacing and add one for the fixture at the far end, then recompute the exact spacing across that whole number. Total load is fixtures times the watts each; low-voltage transformers should run at about 80% of their rating to leave headroom and cope with voltage drop on long runs. For a soft, non-runway look, stagger fixtures 6–10 ft apart rather than lining them up rigidly.
Worked example
For a 40 ft path with lights about 8 ft apart: ⌊40 ÷ 8⌋ + 1 = 6 fixtures, which land exactly 40 ÷ 5 = 8 ft apart. At 4 W each that is 24 W, so a transformer of at least 24 ÷ 0.8 = 30 W is needed — round up to the next standard size.
Frequently asked questions
How far apart should path lights be?
Six to ten feet is the usual range. Closer spacing gives a continuous glow and more security lighting; wider spacing creates pools of light with darker gaps between, which many designers prefer for a natural look.
What size transformer do I need?
Add up the wattage of every fixture and choose a transformer rated at least 25% higher, so it runs near 80% of capacity. That headroom covers voltage drop on the cable and lets you add fixtures later.
Can I put lights on both sides of the path?
Yes, but stagger them rather than placing them directly opposite each other — offset fixtures light the path more evenly and avoid a harsh, symmetrical runway effect. Double the fixture count if you run both sides.
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This calculator is for educational purposes. Double-check important results before acting on them.