Phots to Foot-candles Converter
Quick answer: To convert phots to foot-candles, multiply by 929.0304. For example, 10 ph is 9,290.304 fc. One phot equals 929.0304 fc.
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Use the Phots to Foot-candles Converter
Phots to Foot-candles formula and what each symbol means
fc = ph × 929.0304
| Symbol | Meaning |
|---|---|
| ph | Phot |
| fc | Foot-candle |
Phots to Foot-candles examples
1 ph
1 ph × 929.0304 = 929.0304 fc.
10 ph
10 ph × 929.0304 = 9,290.304 fc.
100 ph
100 ph × 929.0304 = 92,903.04 fc.
Phots compared with Foot-candles
One ph is 929 times as large as one fc, so your number gets bigger when you convert phots to foot-candles and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About phots and foot-candles
Phot (ph): The phot, 10,000 lx. Foot-candle (fc): The foot-candle, one lumen per square foot, about 10.764 lx.
How to calculate Phots to Foot-candles step by step
- Enter the value in ph (the starting unit).
- Multiply by 929.0304, because 1 ph = 929.0304 fc.
- The product is the value in fc. To go back, divide by 929.0304 or multiply by 0.001076391.
Popular illuminance conversions
How to read your Phots to Foot-candles result
Quick estimate: multiply by about 930 to get foot-candles from phots; this is within 0.2% of the exact factor. The SI unit is the lux, one lumen per square metre.
| PHOTS | FOOT-CANDLES |
|---|---|
| 1 | 929.0304 |
| 2 | 1,858.061 |
| 5 | 4,645.152 |
| 10 | 9,290.304 |
| 20 | 18,580.61 |
| 50 | 46,451.52 |
| 100 | 92,903.04 |
| 1,000 | 929,030.4 |
Foot-candles to Phots: quick table
| FOOT-CANDLES | PHOTS |
|---|---|
| 1 | 0.001076391 |
| 5 | 0.005381955 |
| 10 | 0.01076391 |
| 25 | 0.02690978 |
| 50 | 0.05381955 |
| 100 | 0.1076391 |
| 250 | 0.2690978 |
| 500 | 0.5381955 |
Common mistakes when calculating Phots to Foot-candles
- Confusing illuminance (lux) with luminance (cd/m²).
- Dividing when you should multiply: from ph to fc multiply by 929.0304; from fc to ph divide by 929.0304.
Phots to Foot-candles FAQ
How many fc are in 1 ph?
1 ph equals 929.0304 fc.
How many ph are in 1 fc?
1 fc equals 0.001076391 ph.
Is 1 ph = 929.0304 fc an exact conversion?
The factor is shown rounded to 7 significant figures (929.0304). The calculator above uses more digits.
What is a phot (ph)?
The phot, 10,000 lx.
How can I estimate phots to foot-candles in my head?
Quick estimate: multiply by about 930 to get foot-candles from phots; this is within 0.2% of the exact factor.
What is 3 ph in foot-candles?
3 ph = 2,787.091 fc (since 3 × 929.0304).
What is 30 ph in foot-candles?
30 ph = 27,870.91 fc (since 30 × 929.0304).
What is 150 ph in foot-candles?
150 ph = 139,354.6 fc (since 150 × 929.0304).
How many decimals should I keep when converting ph to fc?
Match the precision of your original measurement. For example, 9,290.304 fc rounds to 9,290 fc at 3 significant figures; keep more digits only for engineering or scientific work.
More in Illuminance converters
- Foot-candles to Kilolux Converter
- Lux to Foot-candles Converter
- Foot-candles to Lux Converter
- Kilolux to Phots Converter
- Kilolux to Lux Converter
- Kilolux to Foot-candles 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)