Foot-candles to Centimeter-candles Converter (fc to ph)
fc × 0.001076391 = ph
Calculation: 1 fc × 0.001076391 = 0.001076391 ph
Common Foot-candle to Centimeter-candle Calculations
Quick-lookup reference table showing calculated equivalents for standard increments between Foot-candle (fc) and Centimeter-candle (ph).
| Conversion & Equivalent Value | Scientific Notation |
|---|---|
| 0.001 fc 1.076391 × 10⁻⁶ ph | 1.076 × 10⁻⁶ |
| 0.01 fc 1.076391 × 10⁻⁵ ph | 1.076 × 10⁻⁵ |
| 0.1 fc 0.000107639 ph | 1.076 × 10⁻⁴ |
| 0.5 fc 0.000538196 ph | 5.382 × 10⁻⁴ |
| 1 fc 0.00107639 ph | 1.076 × 10⁻³ |
| 2 fc 0.00215278 ph | 2.153 × 10⁻³ |
| 5 fc 0.00538196 ph | 5.382 × 10⁻³ |
| 10 fc 0.0107639 ph | 1.076 × 10⁻² |
| 20 fc 0.0215278 ph | 2.153 × 10⁻² |
| 25 fc 0.0269098 ph | 2.691 × 10⁻² |
| 50 fc 0.0538196 ph | 5.382 × 10⁻² |
| 100 fc 0.107639 ph | 1.076 × 10⁻¹ |
| 250 fc 0.269098 ph | 2.691 × 10⁻¹ |
| 500 fc 0.538196 ph | 5.382 × 10⁻¹ |
| 1000 fc 1.076391 ph | 1.076 × 10⁰ |
| Reciprocal & Equivalent Value | Scientific Notation |
|---|---|
| 1 ph 929.0304 fc | 9.29 × 10² |
| 5 ph 4645.152 fc | 4.645 × 10³ |
| 10 ph 9290.304 fc | 9.29 × 10³ |
| 50 ph 46451.52 fc | 4.645 × 10⁴ |
| 100 ph 92903.04 fc | 9.29 × 10⁴ |
Real-World Context & Everyday Benchmarks
Tap to load into converterTo help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Foot-candle (fc) and Centimeter-candle (ph):
Foot-candle References:
- Full moonlight nocturnal ambient illuminance on horizontal plane 0.025 fc
- Commercial warehouse hallway corridor minimum safety illumination 10 fc
- Standard indoor corporate office desk reading illuminance 50 fc
- Direct unobstructed noon summer sunlight illuminance 10000 fc
Centimeter-candle References:
- Night sky illumination under clear full moon light 2.5E-5 ph
- Cozy family living room ambient evening indoor illumination 0.005 ph
- Standard commercial office workspace desk illumination 0.05 ph
- Precision surgical hospital operating table light level 1 ph
How to Convert Foot-candle to Centimeter-candle
Converting Foot-candle (fc) to Centimeter-candle (ph) is a core calculation in Illuminance, which measures the total luminous flux incident and received upon a unit surface area. This calculation navigates the boundary between the International Metric System (SI) and British Imperial / US Customary engineering standards. In contemporary metrology, Imperial units are defined in terms of exact SI standards via international agreements—notably NIST SP 811 and the 1959 International Yard and Pound Agreement. Exactly 1 Foot-candle equals 0.00107639 Centimeter-candle, while 1 ph equals 929.0304 fc.
Mathematical Conversion Derivation via Coherent SI Base Unit
Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (lux (lx)) without arbitrary rounding:
1 fc = 10.76391 lux (lx)1 ph = 10000 lux (lx)V(ph) = V(fc) × ( 10.76391 / 10000 ) = V(fc) × 0.00107639Value in Centimeter-candle = Value in Foot-candle × 0.001076391Direct computational formula applied for standard conversion.To convert 120 Foot-candle (fc) to Centimeter-candle (ph): multiply 120 by 0.00107639 to get 0.129167 ph. At an industrial engineering scale, 5000 fc converts to 5.381955 ph.
Inverse check: 1 ph = 929.0304 fc.Understanding Foot-candle and Centimeter-candle
Foot-candle
fcA Foot-candle (fc) is an imperial and US customary unit for illuminance.
Applications & Practical Context
In practical illumination terms, a full moonlight nocturnal ambient illuminance on horizontal plane equals 0.025 fc, a commercial warehouse hallway corridor minimum safety illumination equals 10 fc, a standard indoor corporate office desk reading illuminance equals 50 fc.
A physical magnitude of 1 fc corresponds to 10.76391 lx in standard SI measurement.
1 fc = 10.76391 lxCentimeter-candle
phA Centimeter-candle (ph) is a decimal multiple of the SI-derived unit for illuminance.
Applications & Practical Context
In practical illumination terms, a night sky illumination under clear full moon light equals 2.5 × 10⁻⁵ ph, a cozy family living room ambient evening indoor illumination equals 0.005 ph, a standard commercial office workspace desk illumination equals 0.05 ph.
A physical magnitude of 1 ph corresponds to 10000 lx in standard SI measurement.
1 ph = 10000 lxDomain Metrology & Engineering Applications
Photometric Inverse Square Law (E_v = Φ_v / A)
Rigorously quantified in laboratory and field settings using cosine-corrected silicon photodiode luxmeters, multi-point illuminance grid loggers, and spectral light meters.
Applied across commercial architectural lighting compliance, museum light damage prevention, greenhouse horticultural lighting, and industrial workplace safety under international metrology standard ISO 8995:2002, ISO 80000-7:2019.
Physical Orders of Magnitude & Laboratory Reference Benchmarks
| Physical Phenomenon / Engineering Reference | Reference Value | Converted to Centimeter-candle |
|---|---|---|
| Full moonlight nocturnal ambient illuminance on horizontal plane | 0.025 fc | 2.690978 × 10⁻⁵ ph |
| Commercial warehouse hallway corridor minimum safety illumination | 10 fc | 0.0107639 ph |
| Standard indoor corporate office desk reading illuminance | 50 fc | 0.0538196 ph |
| Direct unobstructed noon summer sunlight illuminance | 10000 fc | 10.76391 ph |
Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 8995:2002, ISO 80000-7:2019 and the BIPM SI Brochure (9th Edition). Governed by Photometric Inverse Square Law (E_v = Φ_v / A) under ISO 80000 dimensional vector [L⁻² J].
Illuminance to Total Incident Luminous Flux Bridge (Lumens • Millilumens • Kilolumens • MSCP)
Calculate total incident luminous flux Φ = E_v × A captured across work surfaces and architectural envelopes, bridging surface illuminance [L⁻² J] and total luminous flux [J] via surface area (A).
Φ = E_v × A
[lx] × [m²] → [lm]
-
1. Normalize Input to SI Base Unit (lx):
E_v = 1 fc × 10.76391042 = 10.76391042 lx -
2. Apply Engineering Parameter (A):
Selected condition: Commercial Office Floor (25 m²) at A = 25 m² -
3. Execute Governing Physical Law in SI Units:
Φ = E_v × A = (10.76391042 lx) × (25 m²) = 269.09776 lm -
4. Convert to Standard Engineering Units:
• lm: 269.09776 × 1 = 269.0978 lm (Lumens) • mlm: 269.09776 × 1000 = 269097.76 mlm (Millilumens) • klm: 269.09776 × 0.001 = 0.2691 klm (Kilolumens) • MSCP: 269.09776 × 0.07958 = 21.4141 MSCP (Mean Spherical Candlepower) • cp-flux: 269.09776 × 0.07958 = 21.4141 cp-flux (Candlepower Flux) • Mlm: 269.09776 × 1 × 10⁻⁶ = 0.0002691 Mlm (Megalumens)
| Engineering Substance / Operating Standard | Parameter Value (m²) | Reference State / Condition | Typical Industrial & Engineering Application |
|---|---|---|---|
| Executive Desk Work Surface (1.5 m²) | 1.5 |
1.5 m² (16 ft²) | Standard office task-plane lighting footprint |
| Commercial Office Floor (25 m²) | 25 |
25.0 m² (269 ft²) | Standard 5m × 5m open office workstation area |
| School Classroom Floor (60 m²) | 60 |
60.0 m² (646 ft²) | Standard academic lecture / study room |
| Industrial Warehouse Bay (500 m²) | 500 |
500.0 m² (5,380 ft²) | Logistics distribution racking corridor |
| FIFA Competition Football Pitch (7,140 m²) | 7140 |
7,140 m² (76,854 ft²) | Stadium tournament playing pitch (105m × 68m) |
Frequently Asked Questions
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