Is Luminance Converter free to use?

Yes, Luminance Converter is completely free. No subscription, no credit card, and no account required — ever.

Do I need to create an account to use Luminance Converter?

No account is needed. Luminance Converter works instantly in your browser — just open the page and start using it.

Is Luminance Converter safe? Does it store my data?

Luminance Converter processes your data locally in your browser. Nothing is sent to or stored on our servers.

How do I use Luminance Converter?

Open the tool, enter or paste your input, and your result appears instantly. Use the copy button to save it. The whole process takes under a minute.

Luminance Converter

Convert luminance between candela/m², foot-lambert, nit, and other luminance units.

Convert Units

From:

To:

Result:

Convert luminance measurements between different units including candela per square meter, foot-lambert, nit, stilb, and more.

What is Luminance Converter?

Luminance is the intensity of light emitted from a surface per unit area in a given direction.

Understanding the Units

Candela per Square Meter (cd/m²)

SI unit of luminance. Also called nit.

Common Uses: Display brightness, lighting

Nit

Same as cd/m². Common in display specifications.

Common Uses: TV and monitor brightness

Foot-lambert (fL)

Imperial unit of luminance.

Common Uses: Cinema projection

Conversion: 1 fL = 3.426 cd/m²

Common Conversions

Smartphone screen: 400–600 nits (cd/m²)
Standard computer monitor: 250–350 nits
HDR TV peak brightness: 1,000–10,000 nits
Cinema projection screen: ~48 nits = 14 foot-lamberts

Conversion Formulas

Luminance = Luminous Intensity ÷ Projected Area (L = I/A)
cd/m² to foot-lambert: fL = cd/m² ÷ 3.426
Foot-lambert to cd/m²: cd/m² = fL × 3.426
cd/m² and nit are identical units (1 nit = 1 cd/m²)

Practical Examples

Reading under direct sunlight: ~120,000 cd/m² surface luminance

Standard office monitor at max brightness: 300–400 nits

Smartphone outdoor mode: 800–2,000 nits for sunlight readability

Movie projector (IMAX): 14 foot-lamberts = ~48 nits (industry standard)

When to Use Each Unit

cd/m² (Nits): Display and monitor brightness specs, TV and phone ratings

Foot-lamberts (fL): Cinema projection standards, especially in the US

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