Foot-candles (fc)	Phots (ph)
1 fc	0.001076 ph
2 fc	0.002153 ph
5 fc	0.005382 ph
10 fc	0.01076 ph
25 fc	0.02691 ph
50 fc	0.05382 ph
100 fc	0.1076 ph
250 fc	0.2691 ph
500 fc	0.5382 ph
1000 fc	1.0764 ph

Convert Foot-candles to Phots

Convert foot-candles to phots (fc to ph) with our instant calculator. 1 fc = 0.001076 ph. Includes exact formula and reference tables.

How to Convert Foot-candles to Phots (fc to ph)

1 Foot-candle (fc) is equal to 0.001076 Phots (ph). Multiply the foot-candle value by 0.001076391042

Quick Answer 1 fc = 0.001076 ph

Formula ph = fc × 0.001076391042

Inverse Factor 1 ph = 929.0304 fc

Unit Definitions & Metrology Context

The SI unit of illuminance is the lux (lx), which equals one lumen per square meter (1 lx = 1 lm/m²). It quantifies the intensity of light falling on a given surface.

About Foot-candles (fc): Foot-candle (fc) is a unit in the Illuminance measurement category. It is widely used in us architectural & photography lighting (1 lm/ft²). Relative to the illuminance base unit, 1 fc equals 10.76391 Lux (lx).

About Phots (ph): Phot (ph) is a unit in the Illuminance measurement category. It is widely used in cgs optical standard (10,000 lux / 1 lm/cm²). Relative to the illuminance base unit, 1 ph equals 10000 Lux (lx).

Need to convert in the opposite direction? Visit our Convert Phots to Foot-candles (ph to fc) calculator (1 ph = 929.0304 fc).

Step-by-Step Worked Examples (fc to ph)

Convert 5 Foot-candles to Phots: Applying the formula (ph = fc × 0.001076391042): starting with 5 fc, multiply the foot-candle value by 0.001076391042 to get 0.0054 ph.
Convert 10 Foot-candles to Phots: Applying the formula (ph = fc × 0.001076391042): starting with 10 fc, multiply the foot-candle value by 0.001076391042 to get 0.0108 ph.
Convert 50 Foot-candles to Phots: Applying the formula (ph = fc × 0.001076391042): starting with 50 fc, multiply the foot-candle value by 0.001076391042 to get 0.0538 ph.

Popular Illuminance Conversions

Lux ⇄ Foot-candle

Multiply lux by ~0.092903 to calculate illuminance in foot-candles (or divide lux by 10.7639).

Foot-candle ⇄ Lux

Multiply foot-candles by ~10.7639 to convert to lux (1 fc ≈ 10.764 lx).

Kilolux ⇄ Lux

1 kilolux equals exactly 1,000 lux (typical overcast daylight is 1–10 klx).

Phot ⇄ Lux

1 phot equals exactly 10,000 lux (1 lumen per square centimeter).

Frequently Asked Questions

Verified answers and formulas for converting foot-candles to phots.

How many phots are in 1 foot-candle?

There are 0.001076 phots (ph) in 1 foot-candle (fc). Conversely, 1 phot equals 929.0304 foot-candles.

How do you convert foot-candles to phots?

To convert foot-candles (fc) to phots (ph), use the formula: ph = fc × 0.001076391042. Multiply the foot-candle value by 0.001076391042. For example, 10 fc equals 0.0108 ph.

How do I convert back from phots to foot-candles?

To convert in the reverse direction from phots (ph) to foot-candles (fc), use the inverse formula: fc = ph × 929.0304. Multiply the phot value by 929.0304 (1 ph = 929.0304 fc).

What is the difference between foot-candle (fc) and phot (ph)?

Both foot-candle and phot measure illuminance. Foot-candle (fc) is a unit in the Illuminance measurement category. It is widely used in us architectural & photography lighting (1 lm/ft²). Relative to the illuminance base unit, 1 fc equals 10.76391 Lux (lx). Phot (ph) is a unit in the Illuminance measurement category. It is widely used in cgs optical standard (10,000 lux / 1 lm/cm²). Relative to the illuminance base unit, 1 ph equals 10000 Lux (lx).

How do you convert foot-candles (fc) to lux (lx)?

Multiply the foot-candle value by 10.7639. For example, standard office lighting of 50 fc equals approximately 538.2 lux (50 × 10.7639 ≈ 538 lx).