calculand - Light formulas
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Length formulas
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Heat formulas
Light formulas
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Logarithm
Circular functions
Elements and materials
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Impressum/Contact
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Color temperature
Color temperature shift
Exposure
Exposure index
Exposure time
Exposure value
Film speed
Illuminance
Luminance
Luminosity
Luminous efficacy
Luminous energy
Luminous flux
Luminous intensity
Refractive index
f-Number
Luminosity -
L = f · r² · Ω
aW/m² - Attowatt per square metre
BTU/ft² h - British thermal unit per square foot hour
BTU/ft² s - British thermal unit per square foot second
BTU/in² s - British thermal unit per square inch second
BTU/m² s - British thermal unit per square metre second
cal/in² s - Calorie per square inch second
cal/m² s - Calorie per square metre second
cW/m² - Centiwatt per square metre
crab - Crab
daW/m² - Decawatt per square metre
dW/m² - Deciwatt per square metre
erg/cm² s - Erg per square centimetre second
erg/in² s - Erg per square inch second
erg/m² s - Erg per square metre second
EW/m² - Exawatt per square metre
fW/m² - Femtowatt per square metre
GW/m² - Gigawatt per square metre
g/s³ - Gram per second cubed
hW/m² - Hectowatt per square metre
hp(M)/m², PS/m² - Horsepower (metric) per square metre
bhp/in², bhp/sq. in. - Horsepower per square inch
bhp/m² - Horsepower per square metre
J/cm² s - Joule per square centimetre second
J/ft² s, J/sq. ft. s - Joule per square foot second
J/in² s, J/sq. in. s - Joule per square inch second
J/m² s - Joule per square metre second
J/mm² s - Joule per square millimetre second
kcal/m² s - Kilocalorie per square metre second
kg/s³ - Kilogram per second cubed
kWh/m² s - Kilowatt hour per square metre second
kW/m² - Kilowatt per square metre
MW/m² - Megawatt per square metre
µW/m² - Microwatt per square metre
mW/m² - Milliwatt per square metre
nW/m² - Nanowatt per square metre
PW/m² - Petawatt per square metre
pW/m² - Picowatt per square metre
lb/s³ - Pound per second cubed
E₀ - Solar constant
TW/m² - Terawatt per square metre
var/m² - Var per square metre
VA/m² - Volt ampere per square metre
W/cm² - Watt per square centimetre
W/dm² - Watt per square decimetre
W/ft² - Watt per square foot
W/in² - Watt per square inch
W/km² - Watt per square kilometre
W/m² - Watt per square metre
W/mi², W/sq. mi. - Watt per square mile
W/mm² - Watt per square millimetre
yW/m² - Yoctowatt per square metre
YW/m² - Yottawatt per square metre
zW/m² - Zeptowatt per square metre
ZW/m² - Zettawatt per square metre
r α tauri - Aldebaran radius
r α cen A - Alpha Centauri A radius
r α cen B - Alpha Centauri B radius
arshin - Arshin (арши́н)
AU, UA - Astronomical unit
am - Attometre
M - Basic module
r α ori - Betelgeuse radius
aₒ - Bohr radius
bu - Bu (分, japan.)
bu - Bu (步, chin.)
cbl. - Cable
cal. - Calibre
cm - Centimetre
r ⚳ - Ceres radius
ch. - Chain
CH, Fr. - Charrière (French)
chi - Chi (市尺)
cho - Chō (町)
cubitus - Cubitus, Roman cubit
cun - Cun (市寸)
dam - Decametre
dm - Decimetre
gradus - Degreeus, Roman step
digitus - Digitus, Roman finger
diuim - Diuim (дюйм)
r ⊕, r ♁ - Earth radius
rₑ - Electron radius
Em - Exametre
ftm - Fathom (nautical)
fm - Femtometre (Fermi)
fen - Fen (市分)
ft - Foot
fur - Furlong
fut - Fut (фут)
Gly - Gigalightyear
Gm - Gigametre
Gpc - Gigaparsec
hank cotton - Hank cotton
hao - Hao (毫)
hm - Hectometre
himetric - Himetric
hu - Hu (忽)
in - Inch
r ♃ - Jupiter radius
jo - Jō (丈)
ken - Ken (間)
kly - Kilolightyear
km - Kilometre
kpc - Kiloparsec
lea cotton - Lea cotton
lea hemp - Lea hemp
lea., l. - League
li, 10 hao - Li (市厘)
li - Li (市里, 15 yin)
Ld - Lightday
Lh - Lighthour
Lm - Lightminute
Ls - Lightsecond
ly - Lightyear
ln. - Line
liniya - Liniya (линия)
li. - Link
r ♂ - Mars radius
Mly - Megalightyear
Mm - Megametre
Mpc - Megaparsec
r ☿ - Mercury radius
m - Metre
3 M - Metric foot (basic module)
¼ M - Metric inch (basic module)
mickey - Mickey
µm - Micrometre (Micron)
mi - Mile
milia - Milia (ми́ля)
mil, thou - Milli-inch (Millesimus, Thousands of an inch)
milliarium - Milliarium, Roman mile
mm - Millimetre
r ☾ - Moon radius
mam - Myriametre
mo - Mō (毫)
nm - Nanometre
nm, sm - Nautical mile (Seamile)
r ♆ - Neptune radius
palmus - Palmus, Roman palm
pc - Parsec (Parallax second)
passus - Passus, Roman double step
pes - Pes, Roman foot
Pm - Petametre
piad - Piad (пядь)
pc. - Pica
pm - Picometre
l(P) - Planck length
r ♇ - Pluto radius
p - Point
ri - Ri (里)
rin - Rin (厘)
rd. - Rod (Perch)
sashen - Sashen (сажень)
r ♄ - Saturn radius
l(S) - Schrödinger length
sh. - Shackle
shaku - Shaku (尺)
si - Si (丝)
SU - Siegbahn unit
skein cotton - Skein cotton
r ☉ - Solar radius
spindle scotch - Spindle Scotch
spindle cotton - Spindle cotton
spindle hemp - Spindle hemp
stadium - Stadium, Roman stadium
p.p. - Stitch
l(St) - Stoney length
stopa - Stopa (стопа)
strehn cotton - Strehn cotton
sun - Sun (寸)
tchetvert - Tchetvert (четверть)
Tly - Teralightyear
Tm - Terametre
Tpc - Teraparsec
thread cotton - Thread cotton
thread hemp - Thread hemp
totchka - Totchka (то́чка)
twip - Twip
r ⛢ - Uranus radius
r ♀ - Venus radius
vershok - Vershok (вершок)
verst - Verst (верста́)
XU - X-unit
yd - Yard
yin - Yin (引)
ym - Yoctometre
Ym - Yottametre
zm - Zeptometre
Zm - Zettametre
zhang - Zhang (市丈)
Å - Ångstrøm
asr - Attosteradian
csr - Centisteradian
dasr - Decasteradian
dsr - Decisteradian
fsr - Femtosteradian
µsr - Microsteradian
msr - Millisteradian
nsr - Nanosteradian
psr - Picosteradian
4πsr - Sphere
(´)² - Square arcminute
(´´)² - Square arcsecond
(ᶜ)² - Square centesimal arcminute
(ᶜᶜ)² - Square centesimal arcsecond
cgon² - Square centigon
cm²/m² - Square centimetre per square metre
dm²/m² - Square decimetre per square metre
(°)² - Square degree
ft²/in², sq. ft./sq. in. - Square foot per square inch
ft²/m², sq. ft./m² - Square foot per square metre
gon² - Square gon
in²/ft², sq. in./sq. ft. - Square inch per square foot
in²/in², sq. in./sq. in. - Square inch per square inch
in²/m², sq. in./m² - Square inch per square metre
m²/m² - Square metre per square metre
mgon² - Square milligon
mm²/m² - Square millimetre per square metre
(´´´)² - Square tertia
sr - Steradian
ysr - Yoctosteradian
zsr - Zeptosteradian
aW - Attowatt
BTU/h - British thermal unit per hour
BTU/min - British thermal unit per minute
BTU/s, btu/s - British thermal unit per second
cal/h - Calorie per hour
cal/min - Calorie per minute
cal/s - Calorie per second
cW - Centiwatt
ch - Cheval vapeur
daNm/s - Decanewton metre per second
daW - Decawatt
dW - Deciwatt
dyncm/s - Dyne centimetre per second
dynm/s - Dyne metre per second
eV/s - Electronvolt per second
erg/s - Erg per second
EW - Exawatt
fW - Femtowatt
GW - Gigawatt
hW - Hectowatt
hp, bhp - Horsepower (Brake horsepower)
PS, hp(M) - Horsepower (metric)
J/d - Joule per day
J/h - Joule per hour
J/min - Joule per minute
J/s - Joule per second
J/y, J/a - Joule per year
kcal/h - Kilocalorie per hour
kcal/min - Kilocalorie per minute
kcal/s - Kilocalorie per second
kg m²/s³ - Kilogram square metre per second cubed
kpm/s - Kilopond metre per second
kW - Kilowatt
mp - Manpower
MW - Megawatt
mkp/s - Metre kilopond per second
µW - Microwatt
mW - Milliwatt
nW - Nanowatt
Nm/s - Newton metre per second
Ω A² - Ohm ampere squared
Pa m³/s - Pascal cubic metre per second
PW - Petawatt
pW - Picowatt
P(P) - Planck power
p - Poncelet
pm/s - Pond metre per second
lb ft²/s³ - Pound square foot per second cubed
lb in²/s³ - Pound square inch per second cubed
TW - Terawatt
var - Var (Volt Ampere Reactive)
VA - Volt ampere
V²/Ω - Volt squared per ohm
W - Watt
yW - Yoctowatt
YW - Yottawatt
zW - Zeptowatt
ZW - Zettawatt
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