Phots to Foot-candles Converter
Enter the illumination in phots below to convert it to foot-candles.
Convert Phots to Foot-candles
Enter a value in phots (ph) to convert to foot-candles (fc).
Phot to Foot-candle Conversion Table
Table showing various phot measurements converted to foot-candles. Click any preset value or arrow to load it into the converter.
| Phots (ph) | Foot-candles (fc) |
|---|---|
| 1 ph | 929.0304014 fc |
| 2 ph | 1,858.0608029 fc |
| 2.5 ph | 2,322.5760036 fc |
| 5 ph | 4,645.1520072 fc |
| 10 ph | 9,290.3040144 fc |
| 15 ph | 13,935.4560216 fc |
| 20 ph | 18,580.6080288 fc |
| 25 ph | 23,225.7600361 fc |
| 30 ph | 27,870.9120433 fc |
| 50 ph | 46,451.5200721 fc |
How to Convert Phots to Foot-candles
To convert phots to foot-candles, multiply the illumination by the following conversion ratio: 929.0304014 foot-candles/phot.
Since one phot is equal to 929.0304014 foot-candles, you can use this simple formula to convert:
The illumination in foot-candles is equal to the illumination in phots multiplied by 929.0304014.
For example, here's how to convert 5 phots to foot-candles using the formula above.
How Many Foot-candles Are in a Phot?
There are 929.0304014 foot-candles in a phot, which is why we use this value in the formula above.
Our phot to foot-candle calculator automatically converts your illumination measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Phots and foot-candles are both units used to measure illumination. Keep reading to learn more about each unit.
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. [1]
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.
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). [2]
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.
When converting illumination between phots (ph) and foot-candles (fc), keep full floating-point precision (1 ph = 929.0304014 fc; 1 fc = 0.0010764 ph) during intermediate calculations and round only the final foot-candle figure to match your instrument tolerance.
More Phot & Foot-candle Conversions
Need to calculate in the opposite direction? Use our foot-candles to phots calculator to switch your starting unit immediately. You can also explore related tools such as converting foot-candles to phots, converting lux to foot-candles, or converting lux to kilolux.
Convert from Phots
Convert to Foot-candles
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Illumination Metrology Standard — Phots (ph) to Foot-candles (fc)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Phot (lm/cm²) (ph) & Foot-candle (fc)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (ph to fc)