How To Calculate Illuminance

Introduction & Importance

Illuminance, measured in lux, is a crucial factor in lighting design and planning. Understanding how to calculate illuminance ensures optimal lighting levels for various spaces.

How to Use This Calculator

1. Enter the luminous flux (lux) and area (square meters) values.
2. Click ‘Calculate’.
3. View the results and chart below.

Formula & Methodology

The formula for illuminance (E) is:

E = Φ / A

Where:

• E is the illuminance (lux)
• Φ is the luminous flux (lumens)
• A is the area (square meters)

For more information, see:

• U.S. Department of Energy
• Engineering ToolBox