Recessed Light Spacing Calculator

Calculate recessed-light spacing based on ceiling height and fixture diameter.

Light Spacing
— ft apart
Center to center.

Usage Tip

For task areas like a kitchen counter, tighten the spacing; for general ambient light the half-height rule works well.

THE MATH
spacing = ceiling height ÷ 2
first light from wall = spacing ÷ 2
A common rule spaces recessed lights at half the ceiling height, with the first row at half that distance from the wall, giving even overlapping pools of light.
Enter the ceiling height and the fixture diameter.
The spacing is center to center; larger fixtures can sometimes be spaced a little wider.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.