Watt Calculator Tool - Professional Guide 2026

⚡ What is a Watt?

Watt (W) is the unit of measurement for electrical power . It indicates how much energy is consumed for lighting.

📏 Watt Values ​​Per Area

Home Lighting

Living room: 10-15 W/m²
Bedroom: 8-12 W/m²
Kitchen: 12-18 W/m²
Bathroom: 10-15 W/m²
Corridor: 5-8 W/m²

Offices and Workplaces

Office: 12-18 W/m²
Meeting room: 10-15 W/m²
Reception: 15-20 W/m²

Store and Commercial

Store: 15-25 W/m²
Showroom: 20-30 W/m²
Restaurant: 12-18 W/m²

Industrial

Factory: 15-25 W/m²
Storage: 10-15 W/m²
Workshop: 18-25 W/m²

📊 Watt Calculation Formula

Basic Formula:
Total Watt = Area (m²) x Watt/m²

💡 Practical Calculation Examples

Example 1: Living Room Lighting

Area: 25 m²
Watt/m²: 12W

Calculation: 25 x 12 = 300W

Solution:
- 20 x 15W LED spotlights = 300W
- 1 x 60W LED chandelier + 12 x 20W spotlights = 300W

Example 2: Office Lighting

Area: 50 m²
Watt/m²: 15W

Calculation: 50 x 15 = 750W

Solution:
- 20 x 36W LED panels (60x60) = 720W
- 50 x 15W LED spotlights = 750W

Example 3: Store Lighting

Area: 80 m²
Watt/m²: 20W

Calculation: 80 x 20 = 1600W

Solution:
- 80 x 20W track spotlights = 1600W
- 40 x 40W LED strips = 1600W

⚡ LED vs Incandescent Comparison

Incandescent → LED Conversion:
- 60W incandescent = 9W LED (85% savings)
- 100W incandescent = 15W LED (85% saving)
- 150W incandescent = 20W LED (87% savings)

Example: 20 m² room
- Old: 4 x 60W incandescent bulbs = 240W
- New: 16 x 9W LEDs = 144W
- Savings: 40%

💰 Energy Cost Calculator

Formula:
Monthly Cost = (Watt x Hours/day x 30 days) / 1000 x Electricity Price

Example:
- 300W lighting
- 8 hours a day
- Electricity: 3 TL/kWh

Calculation:
(300 x 8 x 30) / 1000 x 3 = 216 TL/month

✅ Important Notes

• 💡 Excess watts: Waste of energy
• 🔅 Low wattage: Insufficient lighting.
• ⚡ Choose LED: 80-90% energy savings
• 🔆 Use a dimmer: Save an additional 30%.

🎯 Result

Accurate watt calculation ensures energy savings and comfortable lighting .

📦 Free Consultation: Watt calculation and product recommendation for your project!