Recessed Lighting Calculator
Estimate a simple evenly spaced recessed-light layout.
Formula and assumptions
Geometric layout estimate only; follow fixture, ceiling, task-lighting and electrical requirements.
Results depend on the inputs and assumptions shown. Check units and independently verify important decisions.
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Frequently asked questions
How far apart should recessed lights be?
Spacing depends on ceiling height, fixture beam angle, brightness, room use and desired overlap. This calculator provides a simplified even-spacing estimate.
How many recessed lights does a room need?
Room dimensions alone are not enough for a precise lighting plan. Fixture lumen output, ceiling height, surface reflectance and task lighting all affect the result.
Does this replace an electrical plan?
No. Follow fixture instructions and local electrical codes, and use a qualified electrician where required.