About Recessed Light Calculator

The recessed light calculator on this site is a free planning tool for recessed lighting layouts. We built it for homeowners pricing out a kitchen remodel, electricians sizing a contract, contractors estimating a new build, and interior designers laying out feature lighting. Every calculator runs in your browser with no signup, no tracking, and no submit button — change any input and the math updates live.

The methods we use are the same lumen and spacing rules taught in IES (Illuminating Engineering Society) handbooks and used by electrical contractors across North America. Plug in your room and you'll get the same numbers a lighting designer would hand back after an hour of calculation. Beyond the main calculator, the site covers room-specific guides like kitchen lighting and bathroom lighting, plus reference tools for foot-candles and lux.

Questions or corrections? Contact us. For details on data handling, see the privacy policy.