HOMEQIA Lighting Calculator
Find out how much light your room actually needs — broken into ambient, task and accent lighting, not just one overhead fixture.
No signup · No email · No credit card · Free to use
What room are you lighting?
Different rooms need different light levels.
Tell us about your room
How big is the space? Switch units any time.
Your Lighting Plan
This is a recommended starting estimate based on general lighting-design guidelines — ceiling height, wall color, and natural light all affect what a room actually needs. Layer multiple fixtures rather than relying on one single source.
How This Calculator Works
Lighting designers use a measurement called foot-candles to describe how much light a space needs for its function — a bedroom needs far less than a kitchen prep area. This calculator multiplies your room's area by a target foot-candle level for its room type, then splits that total across three layers: ambient (general room light), task (focused light for an activity), and accent (smaller, warmer fixtures that add depth). That three-layer split is the same principle covered in our room-by-room guide to layering lighting — this tool just gives it real numbers for your specific room.
Why One Overhead Light Is Rarely Enough
A single ceiling fixture, even a bright one, only covers the ambient layer. A room lit only this way tends to feel flat and clinical rather than comfortable, regardless of how many total lumens it produces. Splitting the same total light budget across multiple fixtures at different heights — a floor lamp, a table lamp, task lighting where you actually work — makes a room feel considered rather than just illuminated.
Planning the Rest of the Room
If you're furnishing the room at the same time, the free HOMEQIA Smart Room Planner can help size furniture and a rug for the same space, and our guide on choosing furniture that actually fits your room covers the proportion principles behind both.
How many lumens does a room need?
It depends on the room's size and function — a bedroom typically needs around 15 lumens per square foot, while a kitchen or home office needs closer to 40, since those rooms require more light for tasks rather than just ambient comfort.
What’s the difference between ambient, task and accent lighting?
Ambient is the general light that fills a room, usually from an overhead fixture or multiple ceiling lights. Task lighting is focused light for a specific activity, like reading or cooking. Accent lighting is smaller, warmer light — lamps and fixtures — that adds depth rather than brightness.
How do I convert lumens to watts?
It depends on the bulb, but a reasonable estimate for LED bulbs is about 80 lumens per watt. Older incandescent bulbs produce far fewer lumens per watt, which is part of why switching to LED meaningfully reduces energy use for the same brightness.
Is more light always better?
No — a room lit beyond what it needs can feel clinical or harsh rather than comfortable. The goal is matching light level to the room's function, then layering it across multiple fixtures instead of one single bright source.