Photometry
phtofc
Convert phots (ph) to foot-candles (fc).
Factor1 ph = 929.0304 fc
Converter
ph
Accepts numbers or expressions, e.g. 150 + 14.7
Result
fc
Rendered to 6 significant figures.
Formula
Formula
fc = ph × 929.0304
Multiply any value in phots by 929.0304 to obtain the value in foot-candles.
Worked example
Convert 1 ph to fc.
- 01Start with 1 ph.
- 02Multiply by the conversion factor: 1 × 929.0304 = 929.03 fc.
Result1 ph = 929.03 fc
Conversion table
| ph | fc |
|---|---|
| 1 | 929.03 |
| 2 | 1858.1 |
| 5 | 4645.2 |
| 10 | 9290.3 |
| 20 | 18581 |
| 50 | 46452 |
| 100 | 92903 |
| 200 | 1.8581e+5 |
| 500 | 4.6452e+5 |
| 1000 | 9.2903e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ph to fc?
1 ph equals 929.0304 fc. To convert, multiply the value in phots by 929.0304.
How do I convert 1 ph to fc?
1 ph = 929.03 fc. For any value, multiply by 929.0304.
How do I convert fc back to ph?
Divide by the same factor — or equivalently, multiply by 0.001076391. So 1 fc = 0.00107639 ph.
When would I need to convert phot to foot-candle?
Illuminance conversions between ph and fc are used in lighting design, workplace safety assessments, and photographic exposure work. Lux is the SI standard for international codes; foot-candles remain common in US lighting specifications.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).