Free Room Lighting Calculator – Instantly Find the Right Fixture Size
Quick answer: Multiply your room square footage by its lumens-per-sq-ft target, then adjust for ceiling height. Living rooms and bedrooms want 10–20 lm/sq ft; dining rooms 20–35; kitchens and bathrooms 30–40. Use the calculator below to get an instant number — then shop fixtures matched to your result right here.
Room Lighting Calculator
How the Room Lighting Calculator Works
Lighting is measured in lumens (brightness), not watts. This calculator uses the Hausgem Lighting Standard: room area in square feet multiplied by a lumens-per-sq-ft target for your room type, then a ceiling-height adjustment (~10% per foot above 8 ft). Divide the result by ~800 lumens per bulb to estimate how many fixtures you need.
Recommended Lumens by Room
| Room | Lumens / sq ft | Example | Total lumens | Color temp |
|---|---|---|---|---|
| Living room | 10–20 | 16 × 14 (224 sq ft) | 2,200–4,500 | 2700–3000K |
| Bedroom | 10–20 | 12 × 12 (144 sq ft) | 1,500–2,900 | 2700K |
| Dining room | 20–35 | 12 × 14 (168 sq ft) | 3,400–5,900 | 2700–3000K |
| Kitchen | 30–40 | 12 × 12 (144 sq ft) | 4,300–5,800 | 3000–3500K |
| Bathroom | 30–40 | 8 × 10 (80 sq ft) | 2,400–3,200 | 3000–4000K |
| Foyer / Entryway | 15–25 | 8 × 8 (64 sq ft) | 960–1,600 | 2700–3000K |
| Home office | 30–50 | 10 × 12 (120 sq ft) | 3,600–6,000 | 3500–4000K |
Frequently Asked Questions
How many lumens do I need for a living room?
Living rooms want 10–20 lumens per square foot. A 224 sq ft (16 × 14) living room needs roughly 2,200–4,500 lumens of ambient light at 2700–3000K.
How do I calculate lumens for a room?
Multiply room square footage by lumens-per-sq-ft target, then add ~10% per foot for ceilings above 8 ft. The calculator above does it for you instantly.
How many lumens does a kitchen need?
Kitchens want 30–40 lumens per square foot for ambient light, plus dedicated task lighting over counters and islands. A 144 sq ft kitchen needs roughly 4,300–5,800 ambient lumens.
Does ceiling height change how much light I need?
Yes. Taller ceilings need more output to maintain brightness at floor level. The calculator adds ~10% more lumens for each foot of ceiling height above 8 feet.
How many fixtures do I need?
A single chandelier typically produces 800–1,200 lumens per light source. A multi-light chandelier (4–6 bulbs) covers 3,200–7,200 lumens — enough for most living rooms and dining spaces. Add table lamps to reach higher targets.
Can I dim the chandeliers you sell?
Most Hausgem chandeliers are dimmable with standard wall dimmers. Many feature integrated LED — check the product page for dimming specs. All are rated 2700–4000K for warm, cozy light.
Related Lighting Tools
- Chandelier Size Calculator — find the right fixture diameter for your table or room
- How Many Lumens and What Color Temperature? — the full room-by-room reference
- Lighting Sizing Guide — chandelier size by room & lumens by room type
- Shop all chandeliers →