Convert Candelas per Square Foot to Candelas per Square Inch
1 candela per square foot (cd/ft²) = 0.006944444444 candelas per square inch (cd/in²). 1 cd/in² = 144 cd/ft². Example: 15 cd/ft² = 15 × 0.006944444444 = 0.1041666667 cd/in².
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1 cd/ft² = 0.006944444444 cd/in²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk candela per square foot to candela per square inch converter to paste a column from Excel.
How to Convert Candela per Square Foot to Candela per Square Inch
- 1 cd/ft² = 0.006944444444 cd/in²
- 1 cd/in² = 144 cd/ft²
- Example: convert 15 cd/ft² to cd/in²: 15 cd/ft² = 15 × 0.006944444444 cd/in² = 0.1041666667 cd/in²
Formula
cd/in² = cd/ft² ÷ 144
Derivation from SI units:
- 1 cd/ft² = 1/0.09290304 cd/m² ≈ 10.764 cd/m².
- 1 cd/in² = 1/0.00064516 cd/m² ≈ 1550 cd/m².
- 1 cd/ft² = 10.76391041671 cd/m² ÷ 1550.003100006 cd/m² per cd/in² = 0.006944444444444 cd/in²
Both units are defined exactly, so the factor is exact. Candela per Square Foot definition: candela per square foot; Candela per Square Inch definition: candela per square inch.
Worked examples
- A reading of 2 cd/ft² converts to 0.01388888889 cd/in².
2 cd/ft² × 0.006944444444 = 0.01388888889 cd/in² - A value of 20 cd/ft² is 0.1388888889 cd/in².
20 cd/ft² × 0.006944444444 = 0.1388888889 cd/in²
Candela per Square Foot to Candela per Square Inch conversion table
| Candelas per Square Foot (cd/ft²) | Candelas per Square Inch (cd/in²) |
|---|---|
| 0.1 cd/ft² | 0.0006944444444 cd/in² |
| 0.5 cd/ft² | 0.003472222222 cd/in² |
| 1 cd/ft² | 0.006944444444 cd/in² |
| 2 cd/ft² | 0.01388888889 cd/in² |
| 5 cd/ft² | 0.03472222222 cd/in² |
| 10 cd/ft² | 0.06944444444 cd/in² |
| 20 cd/ft² | 0.1388888889 cd/in² |
| 50 cd/ft² | 0.3472222222 cd/in² |
| 100 cd/ft² | 0.6944444444 cd/in² |
| 1000 cd/ft² | 6.944444444 cd/in² |
Where it's used
Candelas per Square Foot are used for US lighting engineering, while candelas per square inch appear in lamp and LED specifications. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Candela per Square Foot to other luminance units
| Conversion | 1 cd/ft² equals |
|---|---|
| candela per square foot to candela per square inch | 0.006944444444 cd/in² |
| candela per square foot to nit | 10.76391042 cd/m² |
| candela per square foot to foot-lambert | 3.141592654 fL |
| candela per square foot to apostilb | 33.81582189 asb |
| candela per square foot to stilb | 0.001076391042 sb |
| candela per square foot to lambert | 0.003381582189 L |
Frequently asked questions
How many candelas per square inch are in 1 candela per square foot?
1 cd/ft² = 0.006944444444 cd/in².
How do I convert candelas per square foot to candelas per square inch?
Multiply the value in cd/ft² by 0.006944444444, or divide it by 144. For example, 15 cd/ft² × 0.006944444444 = 0.1041666667 cd/in².
Is the cd/ft² to cd/in² conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "candela per square foot".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "candela per square inch".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Candelas per Square Foot to Candelas per Square Inch. Retrieved October 25, 2026, from https://scientificconverters.com/luminance/candelas-per-square-foot-to-candelas-per-square-inch/
IEEE
Scientific Converters, "Convert Candelas per Square Foot to Candelas per Square Inch," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/candelas-per-square-foot-to-candelas-per-square-inch/