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Convert Skots to Apostilbs

Skot (sk) to Apostilb (asb) luminance conversion — enter any value below to get an instant result, or use the table for common values.

Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.

The numeric value you want to convert. Decimals are accepted.

Result

1 sk = 0.001 asb

1 Skot = 0.001 Apostilbs

1 Apostilb = 999.99996 Skots

1 sk in every supported unit

Conversion chart: Skot to Apostilbs

Conversion table

Skot (sk) Apostilb (asb)
0.01 sk 1E-05 asb
0.1 sk 0.0001 asb
1 sk 0.001 asb
2 sk 0.0020000001 asb
3 sk 0.0030000001 asb
5 sk 0.0050000002 asb
10 sk 0.01 asb
20 sk 0.020000001 asb
50 sk 0.050000002 asb
100 sk 0.1 asb
1000 sk 1 asb

Skot (sk)

Definition: A luminance unit for very low, near-threshold brightness levels — one skot equals one-thousandth of an apostilb — used specifically in scotopic (night/dim-light) vision research.

History: Derived from the Greek "skotos" ("darkness"), introduced by vision scientists to give scotopic-range luminance measurements a unit scaled appropriately to the eye's dark-adapted sensitivity rather than forcing tiny fractional lambert or apostilb values.

Current use: Used in ophthalmology, night-vision research, and low-light visual perception studies to quantify luminance levels near or below the threshold of human rod-cell vision.

Apostilb (asb)

Definition: A CGS-system luminance unit defined so that a perfectly diffusing surface illuminated at one lux has a luminance of one apostilb — related to the lambert by a factor of 10,000.

History: Introduced in early 20th-century European photometry (the name from Greek "apo-" plus "stilb") as a more conveniently scaled alternative to the stilb for typical illuminated, rather than self-luminous, surfaces.

Current use: Still used in some European ophthalmology and vision science literature, particularly in perimetry equipment that measures visual field sensitivity in apostilbs.

Supported Units

Unit Symbol In cd/m²
Candela per Square Meter cd/m² 1 cd/m²
Candela per Square Centimeter cd/cm² 10000 cd/m²
Candela per Square Foot cd/ft² 10.76391 cd/m²
Candela per Square Inch cd/in² 1550.0031 cd/m²
Kilocandela per Square Meter kcd/m² 1000 cd/m²
Stilb sb 10000 cd/m²
Lumen per Square Meter per Steradian lm/m²/sr 1 cd/m²
Lumen per Square Centimeter per Steradian lm/cm²/sr 10000 cd/m²
Lumen per Square Foot per Steradian lm/ft²/sr 10.76391 cd/m²
Watt per Square Centimeter per Steradian (at 555 nm) W/cm²/sr 6830000 cd/m²
Nit nt 1 cd/m²
Millinit mnt 0.001 cd/m²
Lambert L 3183.0989 cd/m²
Millilambert mL 3.1830989 cd/m²
Foot-Lambert fL 3.4262591 cd/m²
Apostilb asb 0.31830989 cd/m²
Blondel bd 0.31830989 cd/m²
Bril bril 3.1831E-08 cd/m²
Skot sk 0.0003183099 cd/m²

About These Parameters

Value
The luminance value you want to convert, expressed in the "From" unit. Accepts decimals, so you can enter anything from a faint scotopic reading in skots to a display's rated brightness in nits.
From Unit
The unit your input value is currently measured in — a monitor spec sheet's nits, a cinema calibration report's foot-lamberts, or a scientific instrument's candela per square meter.
To Unit
The unit you want the result converted into. Use the swap button to flip From and To instantly and compare figures across display, cinema, and scientific contexts.

How Luminance Conversion Works

The Formula

Every unit here is defined by a fixed multiplier relative to candela per square meter. To convert a value from one unit to another:

result = value × (factor of "From" unit ÷ factor of "To" unit)

For Skot → Apostilb: multiply by 0.001. For example, 1 sk × 0.001 = 0.001 asb.

Nits vs. Candela per Square Meter

A nit and a candela per square meter are exactly the same physical quantity — "nit" is simply the shorter, everyday name adopted by the display and consumer electronics industry. When a phone, TV, or monitor spec sheet quotes "1,000 nits," that number is identical to 1,000 cd/m² in a scientific paper. The two names exist for context, not physics: engineers and physicists tend to write cd/m², while marketing copy, review sites, and display datasheets almost universally write nits.

CGS vs. SI Luminance Units

Several units on this page — the stilb, lambert, apostilb, blondel, bril, and skot — predate the modern SI system and come from the centimeter-gram-second (CGS) system of photometric units used in early 20th-century physics. They were built around the idea of a perfectly diffusing ("Lambertian") surface rather than the candela directly, which is why their conversion factors to cd/m² involve π-related constants (a lambert, for instance, equals 1/π candela per square centimeter). Most of these CGS units have been superseded by candela-per-square-meter and its nit alias in modern engineering, but they still surface in legacy scientific literature, older photometric instruments, and specialized fields like vision research that never fully migrated to SI.

Example

A luminance of 1 sk equals 0.001 asb. For scale, a typical smartphone screen runs around 500-1,000 nits, a calibrated cinema screen is set to roughly 14-16 foot-lamberts, an overcast sky reads around 2,000-4,000 cd/m², and the full moon's surface luminance is only about 2,500 cd/m² despite looking far brighter against a dark night sky.

Frequently Asked Questions

How many Apostilbs are in 1 Skot?

1 Skot (sk) equals exactly 0.001 Apostilbs (asb).

What's the difference between luminance and brightness?

Luminance is the objective, physically measured quantity — candela per square meter, or nits — while "brightness" is often used loosely to describe the subjective perception of how light a surface looks, which also depends on surrounding contrast and the viewer's eye adaptation. Luminance is what a light meter measures; brightness is what a person reports seeing.

Is a nit the same as a candela per square meter?

Yes — a nit and a candela per square meter (cd/m²) are exactly the same unit under two different names. "Nit" is the informal name used throughout the display and consumer electronics industry, while cd/m² is the formal SI name used in scientific and engineering contexts.

Why do cinema screens use foot-lamberts instead of nits?

The film and projection industry standardized on foot-lamberts decades before nits became common in consumer electronics, and SMPTE calibration standards for theatrical and home-theater screens (typically 14-16 foot-lamberts) are still written in that unit today. Converting to nits (1 fL ≈ 3.43 cd/m²) shows that cinema screens are actually much dimmer than a modern smartphone or TV display, which is intentional for a dark viewing room.

Why are there so many old CGS luminance units like the stilb and apostilb?

Before the SI system standardized photometry around the candela and candela-per-square-meter in the mid-20th century, different countries and scientific traditions developed their own luminance units within the centimeter-gram-second (CGS) system — the stilb and lambert in general use, the apostilb and its French-system twin the blondel for illuminated surfaces, and the extremely small bril and skot for vision research into low-light perception. Most have fallen out of everyday use but still appear in older instruments, legacy literature, and specialized scientific fields.

How accurate are these conversions?

Every conversion factor used here is the exact, internationally recognized relationship between the underlying luminance units — results are limited only by floating-point display precision, not by rounded conversion constants.

Convert Skot to Other Luminance Units

Skot to Candela per Square Meter Skot to Candela per Square Centimeter Skot to Candela per Square Foot Skot to Candela per Square Inch Skot to Kilocandela per Square Meter Skot to Stilbs Skot to Lumens per Square Meter per Steradian Skot to Lumens per Square Centimeter per Steradian Skot to Lumens per Square Foot per Steradian Skot to Watts per Square Centimeter per Steradian (at 555 nm) Skot to Nits Skot to Millinits Skot to Lamberts Skot to Millilamberts Skot to Foot-Lamberts Skot to Apostilbs Skot to Blondels Skot to Brils

Possible Luminance Conversions

Lumen per Square Meter per Steradian to Candela per Square Inch Nit to Stilbs Stilb to Watts per Square Centimeter per Steradian (at 555 nm) Lumen per Square Meter per Steradian to Kilocandela per Square Meter Millinit to Candela per Square Inch Candela per Square Meter to Skots Millinit to Lumens per Square Foot per Steradian Millilambert to Blondels Apostilb to Lumens per Square Centimeter per Steradian Skot to Lumens per Square Foot per Steradian Candela per Square Foot to Lumens per Square Centimeter per Steradian Skot to Candela per Square Inch Watt per Square Centimeter per Steradian (at 555 nm) to Blondels Skot to Brils Stilb to Millinits Watt per Square Centimeter per Steradian (at 555 nm) to Candela per Square Inch Millilambert to Candela per Square Foot Candela per Square Centimeter to Apostilbs Lumen per Square Foot per Steradian to Blondels Watt per Square Centimeter per Steradian (at 555 nm) to Foot-Lamberts Apostilb to Candela per Square Centimeter Candela per Square Foot to Lamberts Candela per Square Foot to Candela per Square Inch Lumen per Square Meter per Steradian to Skots Lumen per Square Foot per Steradian to Kilocandela per Square Meter Apostilb to Millilamberts Candela per Square Inch to Lumens per Square Foot per Steradian Kilocandela per Square Meter to Nits Candela per Square Meter to Millilamberts Candela per Square Meter to Nits Candela per Square Centimeter to Foot-Lamberts Watt per Square Centimeter per Steradian (at 555 nm) to Lumens per Square Meter per Steradian Candela per Square Foot to Millilamberts Candela per Square Meter to Lumens per Square Meter per Steradian Foot-Lambert to Lumens per Square Centimeter per Steradian Candela per Square Foot to Lumens per Square Foot per Steradian Candela per Square Meter to Blondels Blondel to Kilocandela per Square Meter Candela per Square Inch to Stilbs Lumen per Square Foot per Steradian to Lumens per Square Meter per Steradian Apostilb to Stilbs Nit to Foot-Lamberts Lumen per Square Foot per Steradian to Brils Watt per Square Centimeter per Steradian (at 555 nm) to Candela per Square Meter Lumen per Square Meter per Steradian to Millilamberts Candela per Square Meter to Lumens per Square Foot per Steradian Bril to Skots Stilb to Foot-Lamberts Lumen per Square Centimeter per Steradian to Foot-Lamberts Lambert to Candela per Square Centimeter Candela per Square Centimeter to Candela per Square Meter Stilb to Kilocandela per Square Meter Nit to Brils Apostilb to Nits Stilb to Nits Blondel to Lamberts Foot-Lambert to Kilocandela per Square Meter Kilocandela per Square Meter to Candela per Square Foot Kilocandela per Square Meter to Candela per Square Meter Stilb to Lumens per Square Foot per Steradian Skot to Candela per Square Centimeter Millinit to Blondels Candela per Square Inch to Blondels Lumen per Square Meter per Steradian to Lamberts Skot to Candela per Square Foot Nit to Skots Candela per Square Centimeter to Candela per Square Inch Lambert to Nits Candela per Square Foot to Watts per Square Centimeter per Steradian (at 555 nm) Bril to Kilocandela per Square Meter Candela per Square Centimeter to Kilocandela per Square Meter Apostilb to Skots Lumen per Square Meter per Steradian to Apostilbs Bril to Apostilbs Apostilb to Lamberts Nit to Candela per Square Foot Lumen per Square Meter per Steradian to Nits Bril to Nits Skot to Millilamberts Watt per Square Centimeter per Steradian (at 555 nm) to Stilbs Lambert to Skots Millilambert to Lumens per Square Meter per Steradian Lumen per Square Foot per Steradian to Stilbs Skot to Candela per Square Meter Apostilb to Millinits Millilambert to Brils Bril to Lamberts Candela per Square Foot to Candela per Square Meter Candela per Square Foot to Skots Millilambert to Skots Lumen per Square Centimeter per Steradian to Apostilbs Candela per Square Inch to Foot-Lamberts Lumen per Square Centimeter per Steradian to Candela per Square Centimeter Bril to Millinits Millinit to Skots Lumen per Square Centimeter per Steradian to Watts per Square Centimeter per Steradian (at 555 nm) Candela per Square Foot to Lumens per Square Meter per Steradian Watt per Square Centimeter per Steradian (at 555 nm) to Candela per Square Centimeter Millilambert to Candela per Square Inch Millinit to Stilbs Candela per Square Inch to Kilocandela per Square Meter Foot-Lambert to Candela per Square Centimeter Blondel to Millinits Apostilb to Candela per Square Inch Lumen per Square Foot per Steradian to Lumens per Square Centimeter per Steradian Watt per Square Centimeter per Steradian (at 555 nm) to Millilamberts Bril to Lumens per Square Meter per Steradian Candela per Square Foot to Apostilbs Millinit to Candela per Square Foot Bril to Millilamberts Blondel to Candela per Square Foot Lambert to Lumens per Square Foot per Steradian Nit to Millinits Lambert to Blondels Kilocandela per Square Meter to Foot-Lamberts Nit to Watts per Square Centimeter per Steradian (at 555 nm) Lambert to Apostilbs Blondel to Nits Lambert to Millilamberts Candela per Square Centimeter to Stilbs Lumen per Square Centimeter per Steradian to Stilbs Bril to Blondels Candela per Square Foot to Kilocandela per Square Meter Millinit to Watts per Square Centimeter per Steradian (at 555 nm) Foot-Lambert to Nits Candela per Square Centimeter to Lumens per Square Centimeter per Steradian Lumen per Square Centimeter per Steradian to Nits Candela per Square Inch to Lumens per Square Centimeter per Steradian Stilb to Apostilbs Kilocandela per Square Meter to Millinits Candela per Square Centimeter to Candela per Square Foot Apostilb to Foot-Lamberts Lumen per Square Meter per Steradian to Stilbs Watt per Square Centimeter per Steradian (at 555 nm) to Lumens per Square Foot per Steradian Bril to Stilbs Skot to Lumens per Square Meter per Steradian Candela per Square Inch to Skots Lumen per Square Centimeter per Steradian to Candela per Square Inch Lumen per Square Meter per Steradian to Candela per Square Foot Lambert to Millinits Lumen per Square Centimeter per Steradian to Lamberts Lumen per Square Foot per Steradian to Lamberts Lumen per Square Foot per Steradian to Candela per Square Foot Millinit to Lumens per Square Centimeter per Steradian Stilb to Skots Blondel to Brils Candela per Square Centimeter to Brils Lumen per Square Centimeter per Steradian to Candela per Square Meter Kilocandela per Square Meter to Brils Lumen per Square Foot per Steradian to Millilamberts Stilb to Blondels Lumen per Square Foot per Steradian to Candela per Square Meter Candela per Square Meter to Apostilbs Lumen per Square Foot per Steradian to Candela per Square Inch Kilocandela per Square Meter to Lumens per Square Foot per Steradian Lambert to Foot-Lamberts Lambert to Candela per Square Meter Nit to Candela per Square Inch Stilb to Candela per Square Centimeter Blondel to Stilbs Stilb to Lamberts Nit to Apostilbs Candela per Square Inch to Brils Lumen per Square Meter per Steradian to Lumens per Square Centimeter per Steradian Apostilb to Watts per Square Centimeter per Steradian (at 555 nm) Stilb to Lumens per Square Centimeter per Steradian Nit to Lumens per Square Centimeter per Steradian Millilambert to Apostilbs Candela per Square Foot to Millinits Lumen per Square Meter per Steradian to Millinits Millilambert to Millinits Millinit to Candela per Square Meter Lumen per Square Meter per Steradian to Brils Millinit to Lamberts Skot to Watts per Square Centimeter per Steradian (at 555 nm) Candela per Square Inch to Candela per Square Meter Skot to Blondels Lumen per Square Foot per Steradian to Candela per Square Centimeter Foot-Lambert to Lumens per Square Foot per Steradian Bril to Candela per Square Centimeter Nit to Millilamberts Candela per Square Foot to Stilbs Foot-Lambert to Skots Candela per Square Meter to Millinits Lambert to Candela per Square Foot Skot to Stilbs Bril to Lumens per Square Centimeter per Steradian Foot-Lambert to Lumens per Square Meter per Steradian Foot-Lambert to Brils Lambert to Watts per Square Centimeter per Steradian (at 555 nm) Bril to Candela per Square Meter Blondel to Watts per Square Centimeter per Steradian (at 555 nm) Lumen per Square Centimeter per Steradian to Brils Lumen per Square Centimeter per Steradian to Blondels Stilb to Candela per Square Meter Watt per Square Centimeter per Steradian (at 555 nm) to Kilocandela per Square Meter Candela per Square Meter to Brils Millilambert to Watts per Square Centimeter per Steradian (at 555 nm) Watt per Square Centimeter per Steradian (at 555 nm) to Skots Candela per Square Inch to Millilamberts Millilambert to Foot-Lamberts Apostilb to Brils Skot to Foot-Lamberts Blondel to Candela per Square Centimeter Lumen per Square Centimeter per Steradian to Skots Kilocandela per Square Meter to Candela per Square Centimeter Skot to Lamberts Foot-Lambert to Millinits Watt per Square Centimeter per Steradian (at 555 nm) to Brils Lumen per Square Centimeter per Steradian to Kilocandela per Square Meter Watt per Square Centimeter per Steradian (at 555 nm) to Candela per Square Foot Candela per Square Meter to Lumens per Square Centimeter per Steradian Kilocandela per Square Meter to Apostilbs Skot to Millinits Millinit to Nits Lumen per Square Meter per Steradian to Lumens per Square Foot per Steradian Candela per Square Centimeter to Watts per Square Centimeter per Steradian (at 555 nm) Millilambert to Stilbs Kilocandela per Square Meter to Watts per Square Centimeter per Steradian (at 555 nm) Candela per Square Foot to Foot-Lamberts Millinit to Apostilbs Kilocandela per Square Meter to Millilamberts Candela per Square Meter to Candela per Square Inch Candela per Square Inch to Lamberts Blondel to Candela per Square Meter Stilb to Millilamberts Candela per Square Inch to Millinits Lumen per Square Meter per Steradian to Candela per Square Centimeter Millilambert to Lamberts Foot-Lambert to Stilbs Nit to Kilocandela per Square Meter Candela per Square Inch to Apostilbs Candela per Square Centimeter to Skots Candela per Square Meter to Kilocandela per Square Meter Bril to Candela per Square Inch Millinit to Kilocandela per Square Meter Lambert to Kilocandela per Square Meter Skot to Lumens per Square Centimeter per Steradian Kilocandela per Square Meter to Lumens per Square Meter per Steradian Millilambert to Candela per Square Meter Nit to Blondels Lumen per Square Meter per Steradian to Blondels Candela per Square Inch to Candela per Square Foot Watt per Square Centimeter per Steradian (at 555 nm) to Lamberts Apostilb to Blondels Candela per Square Inch to Nits Kilocandela per Square Meter to Blondels Lambert to Lumens per Square Centimeter per Steradian Candela per Square Centimeter to Nits Millinit to Millilamberts Candela per Square Inch to Candela per Square Centimeter Foot-Lambert to Blondels Blondel to Lumens per Square Foot per Steradian Foot-Lambert to Lamberts Candela per Square Meter to Foot-Lamberts Nit to Candela per Square Centimeter Apostilb to Lumens per Square Foot per Steradian Foot-Lambert to Candela per Square Inch Candela per Square Foot to Blondels Millinit to Foot-Lamberts Skot to Nits Watt per Square Centimeter per Steradian (at 555 nm) to Lumens per Square Centimeter per Steradian Watt per Square Centimeter per Steradian (at 555 nm) to Apostilbs Candela per Square Centimeter to Lumens per Square Foot per Steradian Nit to Lamberts Candela per Square Inch to Watts per Square Centimeter per Steradian (at 555 nm) Millinit to Candela per Square Centimeter Lambert to Stilbs Lambert to Lumens per Square Meter per Steradian Stilb to Candela per Square Inch Candela per Square Centimeter to Lamberts Stilb to Lumens per Square Meter per Steradian Millilambert to Nits Watt per Square Centimeter per Steradian (at 555 nm) to Millinits Stilb to Candela per Square Foot Candela per Square Inch to Lumens per Square Meter per Steradian Lumen per Square Foot per Steradian to Watts per Square Centimeter per Steradian (at 555 nm) Blondel to Skots Candela per Square Meter to Lamberts Candela per Square Meter to Stilbs Lumen per Square Meter per Steradian to Candela per Square Meter Lumen per Square Meter per Steradian to Watts per Square Centimeter per Steradian (at 555 nm) Millilambert to Candela per Square Centimeter Candela per Square Centimeter to Blondels Bril to Candela per Square Foot Kilocandela per Square Meter to Stilbs Lumen per Square Centimeter per Steradian to Lumens per Square Foot per Steradian Foot-Lambert to Candela per Square Foot Foot-Lambert to Apostilbs Candela per Square Centimeter to Millinits Stilb to Brils Millinit to Lumens per Square Meter per Steradian Nit to Lumens per Square Meter per Steradian Candela per Square Centimeter to Millilamberts Candela per Square Meter to Candela per Square Foot Lumen per Square Foot per Steradian to Apostilbs Foot-Lambert to Millilamberts Nit to Candela per Square Meter Candela per Square Foot to Candela per Square Centimeter Bril to Lumens per Square Foot per Steradian Bril to Watts per Square Centimeter per Steradian (at 555 nm) Blondel to Apostilbs Apostilb to Kilocandela per Square Meter Lumen per Square Centimeter per Steradian to Millilamberts Blondel to Lumens per Square Meter per Steradian Lumen per Square Foot per Steradian to Skots Lambert to Candela per Square Inch Candela per Square Foot to Nits Millilambert to Kilocandela per Square Meter Candela per Square Meter to Candela per Square Centimeter Candela per Square Centimeter to Lumens per Square Meter per Steradian Skot to Kilocandela per Square Meter Watt per Square Centimeter per Steradian (at 555 nm) to Nits Millinit to Brils Skot to Apostilbs Lumen per Square Meter per Steradian to Foot-Lamberts Blondel to Foot-Lamberts Candela per Square Foot to Brils Kilocandela per Square Meter to Skots Lumen per Square Foot per Steradian to Nits Kilocandela per Square Meter to Candela per Square Inch Lumen per Square Foot per Steradian to Foot-Lamberts Bril to Foot-Lamberts Kilocandela per Square Meter to Lumens per Square Centimeter per Steradian Lumen per Square Foot per Steradian to Millinits Blondel to Millilamberts Nit to Lumens per Square Foot per Steradian Blondel to Candela per Square Inch Candela per Square Meter to Watts per Square Centimeter per Steradian (at 555 nm) Foot-Lambert to Candela per Square Meter Apostilb to Lumens per Square Meter per Steradian Apostilb to Candela per Square Meter Kilocandela per Square Meter to Lamberts Lumen per Square Centimeter per Steradian to Lumens per Square Meter per Steradian Millilambert to Lumens per Square Centimeter per Steradian Lambert to Brils Millilambert to Lumens per Square Foot per Steradian Blondel to Lumens per Square Centimeter per Steradian Lumen per Square Centimeter per Steradian to Candela per Square Foot Apostilb to Candela per Square Foot Lumen per Square Centimeter per Steradian to Millinits Foot-Lambert to Watts per Square Centimeter per Steradian (at 555 nm)

See also