Foot-candles to Phots Converter
Quick answer: To convert foot-candles to phots, multiply by 0.001076391. For example, 10 fc is 0.01076391 ph. One foot-candle equals 0.001076391 ph.
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Use the Foot-candles to Phots Converter
Foot-candles to Phots formula and what each symbol means
ph = fc × 0.001076391
| Symbol | Meaning |
|---|---|
| fc | Foot-candle |
| ph | Phot |
Foot-candles to Phots examples
1 fc
1 fc × 0.001076391 = 0.001076391 ph.
10 fc
10 fc × 0.001076391 = 0.01076391 ph.
100 fc
100 fc × 0.001076391 = 0.1076391 ph.
Foot-candles compared with Phots
One ph is 929 times as large as one fc, so your number gets smaller when you convert foot-candles to phots and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About foot-candles and phots
Foot-candle (fc): The foot-candle, one lumen per square foot, about 10.764 lx. Phot (ph): The phot, 10,000 lx.
How to calculate Foot-candles to Phots step by step
- Enter the value in fc (the starting unit).
- Multiply by 0.001076391, because 1 fc = 0.001076391 ph.
- The product is the value in ph. To go back, divide by 0.001076391 or multiply by 929.0304.
Popular illuminance conversions
How to read your Foot-candles to Phots result
Quick estimate: multiply by about 0.00108 to get phots from foot-candles; this is within 0.4% of the exact factor. One foot-candle is one lumen per square foot, about 10.764 lx, and one phot is 10,000 lx.
| FOOT-CANDLES | PHOTS |
|---|---|
| 1 | 0.001076391 |
| 2 | 0.002152782 |
| 5 | 0.005381955 |
| 10 | 0.01076391 |
| 20 | 0.02152782 |
| 50 | 0.05381955 |
| 100 | 0.1076391 |
| 1,000 | 1.076391 |
Phots to Foot-candles: quick table
| PHOTS | FOOT-CANDLES |
|---|---|
| 1 | 929.0304 |
| 5 | 4,645.152 |
| 10 | 9,290.304 |
| 25 | 23,225.76 |
| 50 | 46,451.52 |
| 100 | 92,903.04 |
| 250 | 232,257.6 |
| 500 | 464,515.2 |
Common mistakes when calculating Foot-candles to Phots
- Confusing illuminance (lux) with luminance (cd/m²).
- Dividing when you should multiply: from fc to ph multiply by 0.001076391; from ph to fc divide by 0.001076391.
Foot-candles to Phots FAQ
How many ph are in 1 fc?
1 fc equals 0.001076391 ph.
How many fc are in 1 ph?
1 ph equals 929.0304 fc.
Is 1 fc = 0.001076391 ph an exact conversion?
The factor is shown rounded to 7 significant figures (0.001076391). The calculator above uses more digits.
What is a foot-candle (fc)?
The foot-candle, one lumen per square foot, about 10.764 lx.
How can I estimate foot-candles to phots in my head?
Quick estimate: multiply by about 0.00108 to get phots from foot-candles; this is within 0.4% of the exact factor.
What is 25 fc in phots?
25 fc = 0.02690978 ph (since 25 × 0.001076391).
What is 80 fc in phots?
80 fc = 0.08611128 ph (since 80 × 0.001076391).
What is 500 fc in phots?
500 fc = 0.5381955 ph (since 500 × 0.001076391).
How many decimals should I keep when converting fc to ph?
Match the precision of your original measurement. For example, 0.01076391 ph rounds to 0.0108 ph at 3 significant figures; keep more digits only for engineering or scientific work.
More in Illuminance converters
- Phots to Lux Converter
- Kilolux to Phots Converter
- Phots to Kilolux Converter
- Lux to Foot-candles Converter
- Lux to Kilolux Converter
- Lux to Phots Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the International System of Units (SI)