ConstructionInstant Tool
Recessed Lighting Calculator
Calculate recessed can light count, spacing, layout grid, and room lumens.
ft
Please enter room length
ft
Please enter room width
How Recessed Lighting Calculator Works
Total Lights = Room Area in sq ft × Target Lumens per sq ft / Fixture LumensTo calculate recessed lights, multiply room square footage by target foot-candles or lumens per square foot based on room type, then divide by the lumen rating of each fixture. Spacing between fixtures is determined by dividing room dimensions by rows and columns, while spacing from walls is exactly half the distance between fixtures.
Variable Breakdown
A
Room AreaLength times width of the room in square feet
FC
Target LumensRecommended brightness per square foot for room type
FL
Fixture LumensLight output of each LED can fixture typically 700 to 950 lumens
N
Light CountTotal number of recessed fixtures arranged in grid
Example Calculation
Living Room Lighting Example
A homeowner wants to install 6 inch 950 lumen LED recessed lights in a 16 foot by 12 foot living room.
- Multiply 16 feet length by 12 feet width to calculate 192 square feet
- Multiply 192 square feet by 20 recommended lumens per square foot to get 3840 total lumens
- Divide 3840 lumens by 950 lumens per fixture to get 4.04 fixtures
- Round up to a balanced 2 by 2 or 2 by 3 layout providing 4 to 6 lights spaced 4.5 feet apart
Result:6 Lights in a 2 by 3 Grid spaced 4.5 feet apart
Recommended Room Lighting Foot-Candle Guidelines
| Room Space | Target Lumens per Sq Ft | Recommended Can Size | Color Temp |
|---|---|---|---|
| Kitchen Counter Area | 35 to 50 lumens | 4 inch or 6 inch LED | 3000K to 4000K Clean White |
| Living Room Lounge | 15 to 25 lumens | 6 inch LED Dimmer | 2700K Warm White |
| Home Office Workstation | 40 to 60 lumens | 4 inch or 6 inch LED | 3500K to 4000K Cool White |
| Bathroom Vanity Area | 50 to 70 lumens | 4 inch Wet Rated | 3000K Bright White |
| Hallway and Passage | 10 to 15 lumens | 4 inch Slim LED | 2700K Warm White |
Frequently Asked Questions
How far apart should recessed lights be placed?
A common rule of thumb is to divide ceiling height by two. For an 8-foot ceiling, space lights approximately 4 feet apart. For a 10-foot ceiling, space lights approximately 5 feet apart.
How far from the wall should recessed lights be placed?
Recessed lights should generally be placed half the distance of fixture-to-fixture spacing away from walls to prevent harsh shadows and glare on wall surfaces.
What is better 4 inch or 6 inch recessed lights?
Four inch recessed lights offer a modern sleek aesthetic ideal for task lighting, kitchens, and modern homes. Six inch lights disperse wider illumination suitable for larger rooms and high ceilings.
How many lumens do I need for a kitchen?
Kitchens require 35 to 50 lumens per square foot for general illumination and up to 70 lumens per square foot over countertops and islands for food prep task lighting.
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