Room Lighting Calculator (Lumens)
Calculate required lumens, lux levels, foot-candles, and LED bulb counts for living rooms, kitchens, bathrooms, bedrooms, and home offices.
Room Dimensions & Architectural Factors
Illumination & Bulb Recommendations
Ambient / General (60%)
Ceiling chandeliers, central flush-mount fixtures, or evenly spaced recessed cans for overall room navigation.
Task Lighting (30%)
Directed table lamps, under-cabinet strips, reading sconces, or vanity lights focused where hands-on work occurs.
Accent Lighting (10%)
Wall washers, LED cove backlighting, picture lights, or spotlighting to add depth, dimension, and architectural visual interest.
💡 Recommended Color Temperature: 2700K (Warm White)
For living rooms and lounge spaces, choose 2700K warm-white LED bulbs. Warm white provides a relaxing, welcoming amber hue that mimics evening incandescent lighting without casting harsh blue shadows. For task spaces like kitchens or workbenches, step up to 3000K or 4000K neutral white.
About this tool
How to use it
- Select your room purpose (e.g. living room, kitchen task prep, home office, or bathroom) or choose a common room size template.
- Enter the room length and width to establish floor area in square feet.
- Select your ceiling height (8ft standard to 12ft cathedral) and wall paint tone to account for light reflection and absorption.
- Pick your preferred LED bulb or downlight wattage to view total lumens, lux illuminance, and exact bulb quantities.
Why it matters
Lighting by guesswork results in gloomy dim corners or glaring, over-lit spaces that cause fatigue. Following Illuminating Engineering Society (IES) standards guarantees comfortable, task-appropriate foot-candle levels across layered ambient, task, and accent lighting.
When to use it
Use this calculator when planning a home lighting remodel, adding recessed ceiling pot lights, selecting chandelier bulb quantities, or setting up focused home office desk illumination.
Good to know
Calculations convert between foot-candles (1 lumen per square foot) and metric lux (10.764 lux per foot-candle). Wall reflection factors add 15% to 30% more lumens for medium or dark paint colors. Layered distribution follows the industry standard 60% ambient, 30% task, and 10% accent balance.
Common questions
What is the difference between lumens, lux, and watts?
Watts measure electrical power consumption. Lumens measure the total amount of visible light produced by a bulb regardless of wattage. Lux (and foot-candles) measures how much of that light actually strikes a given surface area (1 foot-candle = 1 lumen per square foot; 1 lux = 1 lumen per square meter).
How many lumens do I need for a living room?
A standard living room requires 15 to 20 foot-candles (150 to 200 lux) of ambient light. For an average 250 sq ft living room, this equates to 3,750 to 5,000 total lumens, which can be distributed across 5 to 6 standard 800-lumen LED bulbs or recessed cans.
Why does kitchen prep require so many more lumens?
Food preparation and cooking involve sharp knives and precise measurement, demanding 50 to 70 foot-candles (500 to 750 lux) of focused task lighting directly over countertops and kitchen islands to prevent shadows cast by your body.
What color temperature (Kelvin) should I choose?
Choose 2700K (warm white) for bedrooms and living rooms to promote relaxation; 3000K (soft white) for kitchens, bathrooms, and dining areas; and 4000K (neutral daylight) for home offices, reading desks, and utility workshops.
How do tall ceilings affect lighting needs?
Light intensity diminishes with distance according to the inverse-square law. For 9-foot ceilings, increase lumens by 10%; for 10-foot ceilings, add 20%; and for 12-foot cathedral ceilings, add 35% to ensure adequate foot-candles reach the living plane.