IlluminancePhot to Foot Candles

Phot to Foot-candles

Snapshot

1 Phot equals 929.0304 Foot-candles. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This conversion uses exact lux-based illuminance definitions.
Example: For 10 Phot, the result equals 9,290.304 Foot-candles.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

929.0304 Foot-candles (fc)

Switch

Machine access

Available to apps and AI agents

Phot to Foot-candles can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

Conversion family: illuminance
Source unit: phot
Target unit: foot_candles

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "illuminance",
  "value": 1,
  "from": "phot",
  "to": "foot_candles"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "illuminance",
    "value": 1,
    "from": "phot",
    "to": "foot_candles",
    "result": {
      "raw": 929.0304,
      "display": "929.0304"
    },
    "canonicalPath": "/illuminance/phot-to-foot-candles/"
  }
}

Full API documentation

Explanation

Formula: Foot-candles = Phot × 929.0304. Why: phot is tied exactly to lux through the square-centimeter to square-meter area relationship, so the route normalizes through lux before applying the target unit.

Phot (ph): a CGS illuminance unit equal to one lumen per square centimeter, which is exactly 10,000 lux.

Foot-candles (fc): an imperial illuminance unit based on lumens per square foot, common in lighting design, building standards, and photographic exposure references.

This route is useful when translating illuminance values between lux-based and foot-candle scales for architectural lighting, workplace standards, and exposure measurements.

This conversion is purely multiplicative because both units reduce through lux using fixed illuminance definitions with no offset.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Phot = 929.0304 Foot-candles (using exact lux-based illuminance definitions).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Phot (ph)	Foot-candles (fc)
1	929.0304
10	9,290.304
50	46,451.52
100	92,903.04
300	278,709.12
500	464,515.2
1,000	929,030.4
10,000	9,290,304

Questions & answers

Frequently Asked Questions

What is 1 phot in foot-candles?

1 Phot equals 929.0304 Foot-candles on this page.

Does this Phot to Foot-candles page use the fixed lux equivalent for foot-candles?

Yes. Foot-candle routes use one fixed lux equivalent on this page, so architectural lighting and exposure values stay aligned across the direct answer, calculator, and table.

When would I convert phot to foot-candles?