A ampere amp ampere amu atomic_mass_unit AU astronomical_unit bbl barrel btu british_thermal_unit C coulomb c speed_of_light cal calorie cd candela centuries century cm centimeter ev electron_volt feet foot fl_oz fluid_ounce ft foot F farad gev 1e9 ev g gram G gravitational_constant h Planck_constant hp horsepower hr hour henries henry H henry Hz hertz in inch inches inch J joule km kilometer kph kilometer / hour kw kilowatt kwh kilowatt hour l liter lb pound light speed_of_light litre liter lm lumen lx lux m meter megohm 1000000 ohm metre meter mev 1000000 electron_volt mho siemens microhm 0.000001 ohm microsecond 0.000001 second milligram 0.001 gram millisecond 0.001 second min minute mol mole mm millimeter mph mile / hour ms millisecond N newton qt quart pc parsec pi 3.14159265358979323846 psi pound_force / inch^2 pt pint rpm revolution / second S siemens s second sec second tbsp tablespoon tsp teaspoon T tesla us microsecond V volt W watt Wb weber yd yard yr year acre 43560 foot^2 apoth_dram 60 grain apoth_ounce 480 grain apoth_pound 5760 grain are 100 meter^2 angstrom 0.0000000001 meter astronomical_unit 149600000000 meter atomic_mass_unit dalton atmosphere 101325 pascal bar 100000 pascal barn 1e-28 meter^2 barrel 31.5 gallon baryl dyne / centimeter^2 baud bit / second bolt 40 yard british_gallon 1.20095 gallon british_thermal_unit 1055.06 joule bucket 18180 centimeter^3 bushel 4 peck byte 8 bit cable 720 foot carat 200 milligram caliber 0.001 inch calorie 4.1868 joule candle candela centare 0.01 are centimeter 0.01 meter century 100 year chain 66 foot chronon 1e-24 second coulomb ampere second cup pint / 2 curie 3.7037e10 becquerel dalton 1.6605654e-24 gram daraf 1/ farad day 24 hour decade 10 year degree radian /pi dozen 12 dram 0.00390625 pound dry_barrel 105 dry_quart dry_pint 0.5 dry_quart dry_quart 67.2 inch^3 dyne 0.00001 newton electron_volt 1.60218925e-19 joule ell 45 inch em 0.167 inch en 0.5 em erg 0.000001 joule faraday 96490 coulomb farad coulomb / volt fathom 6 foot fermi 1e-15 meter fluid_dram fluid_ounce / 8 fluid_ounce cup / 8 flux_unit 1e-26 watt/meter^2/Hz foot 12 inch fortnight 2 week free_acceleration 9.80665 meter / second^2 furlong 40 rod gallon 231 inch^3 gauss 0.0001 tesla gilbert ampere turn gill pint / 4 grain pound / 7000 gram 0.001 kg grav free_acceleration gravitational_constant 6.67259e-11 newton meter^2 / kg^2 gross 12 dozen hectare 100 are henry weber / ampere hertz 1 / second hand 4 inch hogshead 63 gallon horsepower 550 foot pound_force / second hour 60 minute inch 0.02539954113 meter joule kg meter^2 / second^2 kilogram kg kilogram_force kg free_acceleration kilometer 1000 meter kilowatt 1000 watt knot nautical_mile / hour lambert 3.142 candela / centimeter^2 league 3 mile light_year 9406910000000000 meter link 7.92 inch liter 1000 centimeter^3 long_ton 2240 pound lumen candela steradian lux lumen / meter^2 maxwell 0.00000001 weber metric_ton 1000 kg micron 0.000001 meter mil 0.001 inch mile 8 furlong miles 1 mile millenium 10 century millimeter 0.001 meter minute 60 second mole 6.02253e23 nautical_mile 1.15078 mile newton joule / meter ohm volt / ampere oil_barrel 42 gallon ounce 0.0625 pound parsec 30856770000000000 meter pascal newton / meter^2 Planck_constant 6.626076e-34 joule second peck 8 dry_quart pennyweight 24 grain pica 12 point pint 0.5 quart point 0.013837 inch poise 0.1 pascal / second pound 0.45359237 kg pound_force pound free_acceleration poundal foot pound / second^2 quadrant 90 degree quart 0.25 gallon revolution 4 quadrant reyn 68947.6 poise rod 16.5 foot rood 0.25 acre rope 20 foot scruple 20 grain section mile^2 siemens ampere / volt skein 360 foot slug 32.1740 pound span 9 inch speed_of_light 299792445.8 meter / second stadion 622 foot stadium 202 yard stokes 0.0001 meter^2 / second survey_mile 320 rod tablespoon fluid_ounce / 2 teaspoon tablespoon / 3 tesla weber / meter^2 therm 1e5 btu ton 2000 pound torr 0.001315789473684210526 atmosphere township 36 section troy_ounce 20 pennyweight troy_pound 12 troy_ounce volt joule / coulomb watt joule / second weber volt second week 7 day yard 3 foot year 365 day deci 1e-1 centi 1e-2 milli 1e-3 micro 1e-6 nano 1e-9 pico 1e-12 femto 1e-15 atto 1e-18 zepto 1e-21 yocto 1e-24 deca 1e1 hecto 1e2 kilo 1e3 myria 1e4 mega 1e6 giga 1e9 tera 1e12 peta 1e15 exa 1e18 zetta 1e21 yotta 1e24