Luminance Converter — cd/m² (Nits) & Foot-Lamberts

Convert luminance between candela per square meter (nits), foot-lamberts, stilbs, and lamberts.

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How this conversion works. Luminance is converted through cd/m² (the nit); lambert-family units carry the exact 1/π relation per NIST Special Publication 811.

How to use

  1. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

Frequently asked questions

How do I convert candela per square meter / nit to foot-lambert?

1 candela per square meter / nit = 0.291864 foot-lambert. Choose "Candela per square meter / Nit (cd/m²)" as From and "Foot-lambert (fL)" as To, type a value, and the result updates instantly.

How many nits is a foot-lambert?

1 fL = 3.4263 cd/m² (nits). Cinema screens target 14–16 fL (48–55 nits); HDR monitors reach 1,000+ nits (292 fL).

Why do the lambert units divide by π?

Lambert-family units describe a perfectly diffuse surface, where luminance = emitted flux density ÷ π. The π converts between the two viewpoints exactly.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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