List of known Units     (the (*) indicates non-standard units)
—   
A AmpereA a year3.15576×10^+7^s a0 (Bohr radius)5.29177×10^-11^m
al light-year9.46053×10^+15^m
alpha (fine structure constant)7.29735×10^-3^
Angstroem Angstroem(0.1nm) (*)10^-10^m
Angstrom Angstroem(0.1nm) (*)10^-10^m
arcm minute of arc4.62963×10^-5^
arcmin minute of arc4.62963×10^-5^
arcs second of arc7.71605×10^-7^
arcsec second of arc7.71605×10^-7^
atm atmosphere1.01325×10^+5^Pa (kg⋅m^-1⋅^s^-2^)
AU astronomical unit1.49598×10^+11^m
au astronomical unit1.49598×10^+11^m
bar bar(10^+5^Pa) (*)10^+5^Pa (kg⋅m^-1⋅^s^-2^)
barn barn(10^-28^m2)10^-28^m^+2^
beam beam 
bit binary information unit 
byte byte(8bits) 
C CoulombC (s⋅A)
c c(speed_of_light)2.99792×10^+8^m⋅s^-1^
cal calorie (*)4.1854J (kg⋅m^+2⋅^s^-2^)
cd candela(lumen/sr)cd
cKayser centi-Kayser(cm^-1^) (*)m^-1^
Crab Crab (X-ray) flux1.43×10^-11^kg⋅s^-3^
ct count 
D Debye (dipole)3.33333×10^-30^m⋅s⋅A
d day8.64×10^+4^s
deg degree2.77778×10^-3^
degC CelsiusK
degF Fahrenheit (*)5.55556×10^-1^K
degree degree2.77778×10^-3^
dyn dyne(10^-5^N) (*)10^-5^N (kg⋅m⋅s^-2^)
e e(electron_charge)1.60218×10^-19^C (s⋅A)
Earth Earth (geo) unit 
eps0 (electric constant)8.85419×10^-12^kg^-1⋅^m^-3⋅^s^+4⋅^A^+2^
erg erg(10^-7^J) (*)10^-7^J (kg⋅m^+2⋅^s^-2^)
eV electron-Volt1.60218×10^-19^J (kg⋅m^+2⋅^s^-2^)
F FaradF (kg^-1⋅^m^-2⋅^s^+4⋅^A^+2^)
G G(gravitation constant)6.673×10^-11^kg^-1⋅^m^+3⋅^s^-2^
g gram10^-3^kg
gauss Gauss(10^-4^T) (*)10^-4^T (kg⋅s^-2⋅^A^-1^)
geoMass Earth mass5.9742×10^+24^kg
H HenryH (kg⋅m^+2⋅^s^-2⋅^A^-2^)
h hour3.6×10^+3^s
h hour3.6×10^+3^s
\h hbar(Planck constant)1.05457×10^-34^kg⋅m^+2⋅^s^-1^
hr hour(use 'h') (*)3.6×10^+3^s
Hz HerzHz (s^-1^)
inch inch (*)2.54×10^-2^m
J JouleJ (kg⋅m^+2⋅^s^-2^)
JD Julian Day8.64×10^+4^s
jovMass Jupiter mass1.8986×10^+27^kg
Jup Jupiter (jovian) unit 
Jy Jansky(10^-26^W/m2/Hz)10^-26^kg⋅s^-2^
K KelvinK
k k(Boltzmann)1.38065×10^-23^kg⋅m^+2⋅^s^-2⋅^K^-1^
kg kilogramkg
l litre (*)10^-3^m^+3^
lm lumen7.95775×10^-2^cd
Lsun solar luminosity3.826×10^+26^W (kg⋅m^+2⋅^s^-3^)
lx lux(lm/m2)7.95775×10^-2^m^-2⋅^cd
lyr light-year (c*yr) (*)9.46053×10^+15^m
m metrem
mag magnitudemag
mas milli-second of arc7.71605×10^-10^
me me(electron_mass)9.10938×10^-31^kg
Mgeo Earth mass5.9742×10^+24^kg
min minute6×10^+1^s
MJD Mod. Julian Date (JD^-2400000.5^)8.64×10^+4^s
Mjup Jupiter mass1.8986×10^+27^kg
mmHg mercury_mm (*)1.33322×10^+2^Pa (kg⋅m^-1⋅^s^-2^)
mol molemol
month month (*) 
mp mp(proton_mass)1.67266×10^-27^kg
Msun solar mass1.989×10^+30^kg
mu0 (magnetic constant)1.25664×10^-6^kg⋅m⋅s^-2⋅^A^-2^
muB (Bohr magneton)9.27401×10^-28^m^+2⋅^A
N NewtonN (kg⋅m⋅s^-2^)
Ohm Ohm(V/A)Ohm (kg⋅m^+2⋅^s^-3⋅^A^-2^)
Pa PascalPa (kg⋅m^-1⋅^s^-2^)
pc parsec3.0857×10^+16^m
ph photon 
pi pi(=3.14...)3.14159
pix pixel 
ppm part per million10^-6^
R R(gas_constant)8.3143kg⋅m^+2⋅^s^-2⋅^K^-1⋅^mol^-1^
rad radian1.59155×10^-1^
Rgeo Earth radius (eq)6.3781×10^+6^m
Rjup Jupiter radius (eq)7.1492×10^+7^m
Rsun solar radius6.9599×10^+8^m
Ry Rydberg(13.6eV)2.17989×10^-18^J (kg⋅m^+2⋅^s^-2^)
S Siemens(A/V)S (kg^-1⋅^m^-2⋅^s^+3⋅^A^+2^)
s seconds
sec second (use 's') (*)s
solLum solar luminosity3.826×10^+26^W (kg⋅m^+2⋅^s^-3^)
solMass solar mass1.989×10^+30^kg
solRad solar radius6.9599×10^+8^m
sr steradian7.95775×10^-2^
Sun Solar unit 
T TeslaT (kg⋅s^-2⋅^A^-1^)
t ton (*)10^+3^kg
u atomic mass unit1.66054×10^-27^kg
uas micro-second of arc7.71605×10^-13^
V VoltV (kg⋅m^+2⋅^s^-3⋅^A^-1^)
W WattW (kg⋅m^+2⋅^s^-3^)
Wb Weber(V⋅s)Wb (kg⋅m^+2⋅^s^-2⋅^A^-1^)
yr year3.15576×10^+7^s
° degree2.77778×10^-3^
°C CelsiusK
°F Fahrenheit (*)5.55556×10^-1^K
µ0 (magnetic constant)1.25664×10^-6^kg⋅m⋅s^-2⋅^A^-2^
µas micro-second of arc7.71605×10^-13^
Å Angstroem(0.1nm) (*)10^-10^m
"d:m:s" degree arcminute arcsecond (sexagesimal angle from degree)2.77778×10^-3^
"date" Fully qualified date8.64×10^+4^s
"datime" Fully qualified date/time8.64×10^+4^s
"day" Day of month number8.64×10^+4^s
"h:m:s" hour minutes seconds (sexagesimal time from hours)3.6×10^+3^s
"h:m" hour minutes (sexagesimal time from hours)3.6×10^+3^s
"HH:MM:SS" hour minutes seconds (sexagesimal time)3.6×10^+3^s
"HHMMSS" hour minutes seconds (sexagesimal time without separator)3.6×10^+3^s
"m:s" minutes seconds (sexagesimal time from minutes)6×10^+1^s
"MM/YY" Month/Year(from 1900)2.6298×10^+6^s
"MM/yy" Month/Year(from 2000)2.6298×10^+6^s
"month" Month name or number2.6298×10^+6^s
"Y-M-D,h:m:s" Fully qualified date/time8.64×10^+4^s
f Kniwn Conversions
— => s Angle to time
m => Hz Wavelength to frequency
Hz => J Frequency to Energy
m => J Wavelength to Energy
K => J Temperature to Energy
kg => J Mass to Energy
m => cKayser Wavelength tp Wavenumber
cKayser => Hz Wavenumber to frequency
cKayser => J Wavenumber to Energy