Background

Illuminance = light on a surface. Lux (lm/m²) is SI, used internationally. Foot-candles (lm/ft²) used in the US. 1 fc = 10.764 lux.

Recommended Levels

Office: 300–500 lux. Retail: 300–1,500 lux. Warehouse: 100–200 lux. Parking: 20–50 lux.

Lux vs Foot-Candles

1 fc = 10.764 lux. 50 fc ≈ 538 lux. Conversion based on m² vs ft².

How to Use This Calculator

1. Select 'Illuminance'

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2. Select your source unit

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3. Enter the value

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4. Select your target unit

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Applications

Lighting Design

Architects specify in lux or fc. Convert for international standards/US equipment.

Workplace Compliance

AS 1680: 320 lux for offices ≈ 30 fc. Convert for US comparisons.

Photography

Well-lit indoor: ~500 lux (46 fc). Light meters may use either unit.

Frequently Asked Questions