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Every room has its own lighting guideline values: from the cosy living room to the workstation with standards requirements.
How the calculation works and what the result means, answered briefly and honestly.
The calculator multiplies the floor area in square metres by a lux guideline value that depends on room type and use: about 100 lux for cosy home lighting, around 300 lux for kitchens and up to 500 lux for concentrated work. The result is a guide for the sum of all light sources in the room, not a laboratory value. Our guide How many lumens per room? explains the calculation methods.
Usually not, and that is a good thing. Pleasant rooms combine ambient light from the ceiling with zone lighting from floor, table or wall lamps. As a rule of thumb, ambient light covers about two thirds of the requirement, and the rest is spread across mood-setting zones. You will find ideas in the floor lamp buying guide.
No. The calculator runs entirely in your browser, with no sign-up, no cookies and no tracking. When you reload the page, all entries are gone.
The recommendation follows your preferred lighting mood: 2,700 kelvin for warm white home lighting, 4,000 kelvin for neutral task lighting, 5,000 to 6,500 kelvin for daylight white brightness. If you want to stay flexible, tunable white solutions are recommended. The kelvin table shows what the values mean.