Foot-candles to Phots Converter
Enter the illumination in foot-candles below to convert it to phots.
Convert Foot-candles to Phots
Enter a value in foot-candles (fc) to convert to phots (ph).
Foot-candle to Phot Conversion Table
Table showing various foot-candle measurements converted to phots. Click any preset value or arrow to load it into the converter.
| Foot-candles (fc) | Phots (ph) |
|---|---|
| 1 fc | 0.0010764 ph |
| 2 fc | 0.0021528 ph |
| 2.5 fc | 0.002691 ph |
| 5 fc | 0.005382 ph |
| 10 fc | 0.0107639 ph |
| 15 fc | 0.0161459 ph |
| 20 fc | 0.0215278 ph |
| 25 fc | 0.0269098 ph |
| 30 fc | 0.0322917 ph |
| 50 fc | 0.0538196 ph |
How to Convert Foot-candles to Phots
To convert foot-candles to phots, multiply the illumination by the following conversion ratio: 0.0010764 phots/foot-candle.
Since one foot-candle is equal to 0.0010764 phots, you can use this simple formula to convert:
The illumination in phots is equal to the illumination in foot-candles multiplied by 0.0010764.
For example, here's how to convert 5 foot-candles to phots using the formula above.
How Many Phots Are in a Foot-candle?
There are 0.0010764 phots in a foot-candle, which is why we use this value in the formula above.
Our foot-candle to phot calculator automatically converts your illumination measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Foot-candles and phots are both units used to measure illumination. Keep reading to learn more about each unit.
What Is a Foot-candle?
A foot-candle is a unit of illumination equal to 10.7639104 lux (lx), the base unit for illumination. Architectural and photography lighting unit (1 lm/ft² ≈ 10.7639 lux). [1]
The foot-candle is classified as a US customary unit of illumination. Foot-candles can be abbreviated as fc; for example, 1 foot-candle can be written as 1 fc.
When working with foot-candles (fc) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, foot-candles (fc) are widely used across standard illumination applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Phot?
A phot is a unit of illumination equal to 10,000 lux (lx), the base unit for illumination. CGS illuminance unit equal to 10,000 lux. [2]
The phot is classified as a metric and SI-compatible unit of illumination. Phots can be abbreviated as ph; for example, 1 phot can be written as 1 ph.
When working with phots (ph) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, phots (ph) are widely used across large-scale industrial, bulk, and macro-level illumination specifications within SI metric workflows, engineering documentation, and technical data sheets.
When converting illumination between foot-candles (fc) and phots (ph), keep full floating-point precision (1 fc = 0.0010764 ph; 1 ph = 929.0304014 fc) during intermediate calculations and round only the final phot figure to match your instrument tolerance.
More Foot-candle & Phot Conversions
Need to calculate in the opposite direction? Use our phots to foot-candles calculator to switch your starting unit immediately. You can also explore related tools such as converting phots to foot-candles, converting foot-candles to lux, or converting lux to kilolux.
Convert from Foot-candles
Convert to Phots
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Illumination Metrology Standard — Foot-candles (fc) to Phots (ph)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Foot-candle (fc) & Phot (lm/cm²) (ph)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (fc to ph)