Convert Lumen per Square Foot to Foot-candle
Enter the number of lumens per square foot that you want to convert to foot-candles.
How to Convert Lumens per Square Foot to Foot-candles
The lumen per square foot and foot-candle are both units of illuminance. By definition, 1 lumen per square foot equals exactly 1 foot-candles. This means to convert lumens per square foot to foot-candles, you multiply by 1.
Formula
Step-by-Step Example
Convert 5 lm/ft² to foot-candles:
We need to convert lumens per square foot to foot-candles
Since 1 lm/ft² = 1 fc, multiply by 1
5 × 1 = 5
5 lm/ft² = 5 fc
Lumen per Square Foot to Foot-candle Conversion Table
Quick reference table for common lumen per square foot to foot-candle conversions. Click any value for detailed calculation.
| Lumens per Square Foot (lm/ft²) | Foot-candles (fc) |
|---|---|
| 1 lm/ft² | 1 fc |
| 2 lm/ft² | 2 fc |
| 5 lm/ft² | 5 fc |
| 10 lm/ft² | 10 fc |
| 15 lm/ft² | 15 fc |
| 20 lm/ft² | 20 fc |
| 25 lm/ft² | 25 fc |
| 50 lm/ft² | 50 fc |
| 100 lm/ft² | 100 fc |
About These Units
Lumen per Square Foot (lm/ft²)
Lumens per square foot (lm/ft²) is identical to foot-candles. The defining relationship: one foot-candle = one lumen per square foot. Used in US lighting calculations: lumens needed = foot-candles × square feet. Standard in American architectural lighting design.
Foot-candle (fc)
A foot-candle (fc) is the imperial illuminance unit—light from one candela source at one foot distance, equal to 10.764 lux. US lighting standards: office 30-50 fc, retail 50-100 fc, warehouse 10-30 fc. IESNA recommendations use foot-candles. One fc = one lumen per square foot.
Frequently Asked Questions
How do I convert lumens per square foot to foot-candles?
To convert lumens per square foot to foot-candles, multiply the value by 1. For example, 10 lm/ft² = 10 fc.
How many foot-candles are in 1 lumen per square foot?
1 lumen per square foot equals 1 foot-candles.
What is the formula for lumens per square foot to foot-candles?
The formula is: fc = lm/ft² × 1.