Convert Lumen per Square Inch to Lumen per Square Foot
Convert lumens per square inch to lumens per square foot by entering a value below.
How to Convert Lumens per Square Inch to Lumens per Square Foot
The lumen per square inch and lumen per square foot are both units of illuminance. 1 lumen per square inch equals 144 lumens per square foot. This means to convert lumens per square inch to lumens per square foot, you multiply by 144.
Formula
Step-by-Step Example
Convert 5 lm/in² to lumens per square foot:
We need to convert lumens per square inch to lumens per square foot
Since 1 lm/in² = 144 lm/ft², multiply by 144
5 × 144 = 719.99999998
5 lm/in² = 719.99999998 lm/ft²
Lumen per Square Inch to Lumen per Square Foot Conversion Table
Quick reference table for common lumen per square inch to lumen per square foot conversions. Click any value for detailed calculation.
| Lumens per Square Inch (lm/in²) | Lumens per Square Foot (lm/ft²) |
|---|---|
| 0.1 lm/in² | 14.4 lm/ft² |
| 0.5 lm/in² | 71.999999998 lm/ft² |
| 1 lm/in² | 144 lm/ft² |
| 2 lm/in² | 287.99999999 lm/ft² |
| 5 lm/in² | 719.99999998 lm/ft² |
| 10 lm/in² | 1440 lm/ft² |
| 25 lm/in² | 3599.9999999 lm/ft² |
| 50 lm/in² | 7199.9999998 lm/ft² |
| 100 lm/in² | 14400 lm/ft² |
About These Units
Lumen per Square Inch (lm/in²)
Lumens per square inch (lm/in²) equals 1,550 lux or 144 foot-candles. Used for high-intensity illumination of small areas: display lighting, inspection systems, and microscopy. One lm/in² = 144 lm/ft². Rarely used; lux or foot-candles preferred.
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.
Frequently Asked Questions
How do I convert lumens per square inch to lumens per square foot?
To convert lumens per square inch to lumens per square foot, multiply the value by 144. For example, 10 lm/in² = 1440 lm/ft².
How many lumens per square foot are in 1 lumen per square inch?
1 lumen per square inch equals 144 lumens per square foot.
What is the formula for lumens per square inch to lumens per square foot?
The formula is: lm/ft² = lm/in² × 144.