Phots (ph)	Foot-candles (fc)
1 ph	929.0304 fc
2 ph	1858.06 fc
5 ph	4645.15 fc
10 ph	9290.3 fc
25 ph	23225.76 fc
50 ph	46451.52 fc
100 ph	92903.04 fc
250 ph	232257.6 fc
500 ph	464515.2 fc
1000 ph	929030.4 fc

Convert Phots to Foot-candles

Convert phots to foot-candles (ph to fc) with our instant calculator. 1 ph = 929.0304 fc. Includes exact formula and reference tables.

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

1 Phot (ph) is equal to 929.0304 Foot-candles (fc). Multiply the phot value by 929.0304

Quick Answer 1 ph = 929.0304 fc

Formula fc = ph × 929.0304

Inverse Factor 1 fc = 0.001076 ph

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 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).

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).

Need to convert in the opposite direction? Visit our Convert Foot-candles to Phots (fc to ph) calculator (1 fc = 0.001076 ph).

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

Convert 5 Phots to Foot-candles: Applying the formula (fc = ph × 929.0304): starting with 5 ph, multiply the phot value by 929.0304 to get 4645.152 fc.
Convert 10 Phots to Foot-candles: Applying the formula (fc = ph × 929.0304): starting with 10 ph, multiply the phot value by 929.0304 to get 9290.304 fc.
Convert 50 Phots to Foot-candles: Applying the formula (fc = ph × 929.0304): starting with 50 ph, multiply the phot value by 929.0304 to get 46451.52 fc.

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 phots to foot-candles.

How many foot-candles are in 1 phot?

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

How do you convert phots to foot-candles?

To convert phots (ph) to foot-candles (fc), use the formula: fc = ph × 929.0304. Multiply the phot value by 929.0304. For example, 10 ph equals 9290.304 fc.

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

To convert in the reverse direction from foot-candles (fc) to phots (ph), use the inverse formula: ph = fc × 0.001076391042. Multiply the foot-candle value by 0.001076391042 (1 fc = 0.001076 ph).

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

Both phot and foot-candle measure illuminance. 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). 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).

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).