Photometry & ImagingFoot Lamberts to Nits

Foot-Lamberts to Nits

Snapshot

1 Foot-Lamberts equals 3.426259 Nits. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This conversion uses fixed luminance constants anchored to candela per square meter.
Example: For 5 Foot-Lamberts, the result equals 17.131295 Nits.
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

3.426259 Nits (nit)

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Machine access

Available to apps and AI agents

Foot-Lamberts to Nits 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: photometry-imaging
Source unit: foot_lamberts
Target unit: nits

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": "photometry-imaging",
  "value": 1,
  "from": "foot_lamberts",
  "to": "nits"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "photometry-imaging",
    "value": 1,
    "from": "foot_lamberts",
    "to": "nits",
    "result": {
      "raw": 3.4262590996,
      "display": "3.426259"
    },
    "canonicalPath": "/photometry-imaging/foot-lamberts-to-nits/"
  }
}

Full API documentation

Explanation

This page converts Foot-Lamberts into Nits using fixed luminance constants anchored to candela per square meter. The direct answer, calculator, and common values table all follow the same factor.

Formula: Nits = Foot-Lamberts × 3.426259. Why: legacy luminance units such as foot-lamberts, lamberts, apostilbs, and stilbs each use fixed cd/m² equivalents, so the calculator normalizes through candela per square meter before applying the target unit.

Foot-Lamberts (fL): a legacy luminance unit often used in projection and cinema display contexts.

Nits (nit): a common display-brightness term numerically equal to candela per square meter.

This route is useful when comparing modern display-brightness values with legacy luminance units used in projection, cinema, and older photometric references.

Because the route stays inside one cd/m2-based luminance model, the mirror page reverses the same constants without changing the underlying assumptions.

Method & Luminance Basis

Method basis: both units reduce through candela per square meter, then apply the fixed target-unit luminance relationship.
Applied factor: 1 Foot-Lamberts = 3.426259 Nits.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Foot-Lamberts (fL)	Nits (nit)
1	3.426259
5	17.131295
10	34.262591
25	85.656477
50	171.312955
100	342.62591
250	856.564775
500	1,713.12955
1,000	3,426.2591

Questions & answers

Frequently Asked Questions

How many nits are in 1 foot-lamberts?

1 Foot-Lamberts equals 3.426259 Nits on this page.

Why is Foot-Lamberts to Nits useful in display and projection work?

This route is useful when comparing modern display-brightness values with legacy luminance units used in cinema, projection, calibration, and older imaging references.

When would I convert foot-lamberts to nits?

This route is useful when comparing modern display-brightness values with legacy luminance units used in projection, cinema, and older photometric references.

How do I reverse Foot-Lamberts to Nits?

Use the mirror Nits to Foot-Lamberts route; it applies the inverse relationship with the same cd/m²-based luminance assumptions.