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Very common unit conversion factors in oil & gas activities sectors

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barrels (oil) = 158.987 liter
bushels (UK) = 36.368 liter
bushels (US) = 35.239 liter
centilitres = 0.01 liter
cubic centimetres = 0.001 liter

gallons (UK) = 4.546 liter
gallons, dry (US) = 4.405 liter
gallons, liquid (US) = 3.785 liter

1 bbl Crude Oil = 5.6MMbtu
1 bbl crude Oil = 5600 cf (cubic feet) natural gas
1 cf natural gas =1000Btu

1 m³ = 35 cf
1MMBtu =28.53 m³ natural gas
1 quadrillion = 10^15 BTU

1 Btu =1055.0558 J
1 cal = 4.1840 J
1 equiv. m³ of crude oil = 37162.1693 MJ =0.3522E+08 Btu
1 equiv. bbl of crude oil =5908.312 MJ = 0.560E+07 Btu =1641.2 kWh
1 equiv. bbl of crude oil =5600.00 equiv. ft³ of Natural Gas
1 equiv. bbl of crude oil =158.5743 equiv. m³ of Natural Gas
1 equiv. bbl of crude oil =0.22857 equiv. ton of coal
1 equiv. m³ of Natural Gas =35314.6667 Btu
1 equiv. m³ of Natural Gas =37.2589 MJ
1 equiv. m³ of Natural Gas =8905.1018 kcal
1 equiv. m³ of Natural Gas =0.0063 equiv. bbl of crude oil
1 equiv. m³ of Natural Gas =35.314666721 equiv. ft³ of Natural Gas
1 million Btu/h =0.2931 MW
1 hp (Metric) =0.7355 kW
1 kW = 1.3596 hp (Metric)
1 Btu/h =0.000398465627 hp (Metric)
1 Btu/h =0.000293071070 kW

1 lbf/in² (psi) =6.894757293 kPa
1 lbf/in² (psi) =703.069579639 mm H2O
1 lbf/in² (psi) =0.0680459639 atm
1 lbf/in² (psi) =0.0689475729 bar

Energyانرژی

1 joule (J) is equal to one newton metre (N.m)
electronvolt (eV) to J: 1.6021892E-19 (1e*1V)
erg to J: 1E-7
foot pound-force (ft.lbf) to J: 1.35582
calorie (cal) to J: 4.1868
kilogram-force metre (kgf.m) to J: 9.80665
British Thermal Unit (Btu) to J: 1.05506E3
watt hour (W.h) to J: 3.6E3
kilowatt hour (kW.h) to J: 3.6E6
therm to J: 1.05506E8 (1E5 Btu)

Temperature دما

Kelvin (K): x K
= (x-273.15) °C
= (5/4)(x-273.15) °Réaumur
= (9/5)x-459.67 °F
= (9/5)x °Rankine
Celcius (also centigrade) (°C): x °C
= (x+273.15) K
= (5/4)x °Réaumur
= (9/5)x+32 °F
= (9/5)(x+273.15) °Rankine
Réaumur (°R): x °Réaumur
= (4/5)x °C
Fahrenheit (°F): x °F
= (5/9)(x+459.67) K
= (5/9)(x-32) °C
= (25/36)(x-32) °Réaumur
= (x+459.67) °Rankine
Rankine (°R): x °Rankine
= (5/9)x K
= (5/9)(x-491.67) °C
= (25/36)(x-491.67) °Réaumur
= (x-459.67) °F

Volumeحجم

mm³ to m³: 1E-9
cm³ / ml to m³: 1E-6
dm³ / l to m³: 1E-3
km³ to m³: 1E9

in³ to m³: 1.6387064E-5
ft³ to m³: 2.8316846E-2 (1728 in3)
yd³ to m³: 7.64554858E-1 (27 ft3)
mile³ to m³: 4.168181825E9 (5451776000 yd3)

UK
minim (UKmin) to m3: 5.91939E-8
fluid drachm (UK fl dr) to m3: 3.55163E-6 (60 UKmin)
fluid ounce (UK fl oz) to m3: 2.84131E-5 (8 UK fl dr)
gill to m3: 1.42065E-4 (5 UK fl oz)
pint (UKpt) to m3: 5.68261E-4 (4 gill)
quart (UKqt) to m3: 1.13652E-3 (2 UKpt)
gallon (UKgal) to m3: 4.54609E-3 (4 UKqt)
peck to m3: 9.09218E-3 (2 UKgal)
bushel to m3: 3.63687E-2 (4 peck)

US (liquid)
minim (USmin) to m3: 6.16115E-8
fluid dram (US fl dr) to m3: 3.69669E-6 (60 USmin)
liquid ounce (US liq oz) to m3: 2.95735E-5 (8 US fl dr)
gill (gi) to m3: 1.18294E-4 (4 US liq oz)
liquid pint (US liq pt) to m3: 4.73176E-4 (4 gi)
liquid quart (US liq qt) to m3: 9.46353E-4 (2 US liq pt)
gallon (USgal) to m3: 3.785411784E-3 (4 US liq qt)
barrel to m3: 1.58987E-1 (42 USgal)

US (dry)
dry pint (dry pt) to m3: 5.50610E-4
dry quart (dry qt) to m3: 1.10122E-3 (2 dry pt)
peck (pk) to m3: 8.80977E-3 (8 dry qt)
bushel (bu) to m3: 3.52391E-2 (4 pk)
dry barrel (bbl) to m3: 1.15627E-1 (210 dry pt?)

Mass جرم

milligram (mg) to kilogram (kg): 1E-6
gram (g) to kg: 1E-3
tonne to kg: 1E3 (1 megagram or Mg)

UK (Avoirdupois)
dram (dr) to kg: 1.77185E-3 (7000/256 grain)
ounce (oz) to kg: 2.83495E-2 (16 dr)
pound (lb) to kg: 0.45359237 exactly (16 oz and 7000 grain)
stone to kg: 6.35029 (14 lb)
slug (also gee pound) to kg: 1.45939E1
quarter (qr) to kg: 1.27006E1 (2 stone)
hundredweight (cwt) to kg: 5.08023E1 (4 qr and 112 lb)
ton (UK) (UKton) to kg: 1.016047E3 (20 cwt and 1.12 short ton)

US
dram (dr) to kg: 1.77185E-3 (as UK)
ounce (oz) to kg: 2.83495E-2 (as UK)
pound (lb) to kg: 0.45359237 (as UK)
short hundredweight (sh cwt) to kg: 4.53592E1 (100 lb)
short ton (sh tn / USton) to kg: 9.07185E2 (20 sh cwt)

Apothecaries
grain (gr in UK, no US symbol) to kg: 6.479891E-5 (1/7000 lb)
scruple to kg: 1.29598E-3 (20 grain)
drachm (dram in US) to kg: 3.88793E-3 (3 scruple)
apothecaries ounce (oz apoth in UK, oz ap in US) to kg: 3.11035E-2 (8 drachm and 1 oz tr)

Troy
grain to kg: as Apothecaries
pennyweight (dwt) to kg: 1.55517E-3 (24 grain)
troy ounce (oz tr) to kg: 3.11035E-2 (20 dwt)
troy pound (lb tr) to kg: 3.73242E-1 (12 oz tr)

Speed سرعت

km/h to m/s: 2.77778E-1
mph to m/s: 4.4704E-1
knots (international) (kn) to m/s: 5.14444E-1

Pressure فشار

1 pascal (Pa) is equal to one newton per square metre (Nm-2 or kgm-1s-2)
pound-force per square foot (lbf/ft2) to Pa: 4.78803E1
millimetre of mercury (mmHg) to Pa: 1.33322E2 (1.00000 torr)
torr to Pa: 1.33322E2 (=101325/760) (1.00000 mmHg)
inch of water (inH20) to Pa: 2.49089E2
inch of mercury (inHg) to Pa: 3.38639E3
pound-force per square inch (lbf/in2) to Pa: 6.89476E3 (144 lbf/ft2)
bar to Pa: 1E5
standard atmosphere (atm) to Pa: 1.01325E5 (760 torr)

Power توان

1 watt (W) is equal to one joule per second (J/s or m2kgs-3)
foot pound-force per second (ft.lbf/s) to W: 1.35582
kilogram-force metre per second (kgf.m/s) to W: 9.80665
horsepower (metric) to W: 7.35499E2 (75 kgf.m/s)
horsepower (hp) to W: 7.45700E2 (550 ft.lbf/s)

Force نیرو

dyne (dyn) to newton (N): 1E-5
poundal (pdl) to N: 1.38255E-1
pound-force (lbf) to N: 4.44822
kilogram-force (kgf) or kilopond (kp) to N: 9.80665
sthène (sn) to N: 1E3

Radiation تابش

Activity
becquerel (Bq) is the SI unit of activity (of radionuclide), (equivalently s-1)
curie (Ci) to Bq: 3.7E10 (37 GBq)
Dose
sievert (Sv) is the SI unit of dose equivalent (equivalently m2/s2, J/kg, Nm/kg)
rem to Sv: 1E-2 (rem is Röntgen Equivalent Man)
Exposure
coulomb per kilogram (C/kg) is the SI unit of radiation exposure
röntgen to C/kg: 2.58E-4