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Oilfield Conversion Factors

Download our Oilfield Conversion Factors PDF
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Important Disclaimer: Conversion Factors are provided as a reference only. Accuracy is not guaranteed.

Length
1 inch = 25.4 millimetres*
1 foot = 12 inches = 0.3048 metre*
1 yard = 3 feet = 0.9144 metre*
1 mile = 1,760 yard = 1.609344 kilometres*
1 British nautical mile = 1.8532 kilometres*
1 international nautical mile = 1.852 kilometres
Area
1 square inch = 6.4516 cm2*
1 square foot = 929.0304 cm2*
1 square yard = 0.83612736 cm2*
1 acre = 4046.8654 m2* = 0.40468564 hectare
1 hectare (ha) = 2.4710538 acres
1 square mile = 2.5899881 km2
Volume
1 bbl (petroleum U.S.) = 42 gallons (U.S) = 0.158987 m3
1 cubic foot = 28.316847 dm3
1 cubic yard = 0.76455486 m3
1 acre foot = 1.233.4818 m3
1 gallon (Imperial) = 4.54609 L*
1 gallon (U.S.) = 3.785412 L
1 quart (Imperial) = 1.136522 L
1 quart (U.S.) = 0.94635264 L
Natural Gas Volume
1 cubic foot (14.73 psia. 60oF) = 0.02832784 m3 (101.325 kPa 15oC)
Natural Gas Liquid Volume
Ethane: 1 bbl = 0.157976 m3
Propane: 1 bbl = 0.15873 m3
Butane: 1 bbl = 0.15881 m3
Propane, butane and ethane converted from 60°F to 15°C, at equilibrium pressure.
Oil Volume Correction Factors
1 bbl (60°F) = (0.1589873 x CF) m3 (15°C)
API Gravity Correction Factor (CF)
0-6 0.9997
7-35 0.9996
36-51 0.9995
52-64 0.9994
65-78 0.9993
79-91 0.9992
92-99 0.9991
Speed
1 mile per hour = 1.609344 km/hr*
1 foot per second 0.3048 m/s*
Mass
1 pound (avoirdupois) = 0.45359237 kg
1 ounce (avoirdupois) = 28.349523 g
1 grain = 64.79891 mg*
1 tonne (t) = 1.000 kg*
1 long ton = 1.016.0469 kg
1 short ton = 907.18474 kg
Density
1 pound per cubic foot = 16.01846 kg/m3
1 pound per cubic inch = 27.67990 Mg/m3
1 long ton per cubic yard = 1,328.939 kg/m3
1 short ton per cubic yard = 1,186.553 kg/m3
Force
1 kilogram (force) = 1 kilopond = 9.80665 newtons*
1 pound (force) = 4.448222 newtons
Pressure
1 psi = 6.894757 kPa
1 standard atmosphere = 101.325 kPa*
1 bar = 100 kPa*
Pipe Pressure
psig MPa
200 1.378951
400 2.757903
600 4.136854
800 5.515806
1,000 6.894757
1,200 273708
1,500 0.342136
Energy
1 Btu 60/61°F = 1,054.615 J
1 Btu (IT) = 1,055.06 J
1 foot-pound = 1.355818 J
1 horsepower-hour = 2.684520 MJ
1 kilowatt-hour = 3.6 MJ* = 3,414 Btu (Int)
Power
1 Btu60/61 per hour = 0.2929486 W
1 foot-pound per hour = 0.3766161 mW
1 horsepower (boiler) = 9.0950 kW
1 horsepower (electric) = 746 W*
1 horsepower (hydraulic) = 746.043 W
1 horsepower (brake) = 745.69999 W
Tempurature
Degrees Fahrenheit (°F) = (°C x 9/5) + 32*
Degrees Centigrade/Celsius (°C) = (°F – 32) x 5/9
Degrees Kelvin (°K) = °C + 273.15*
Degrees Rankine (°R) = °F + 459.67
Degrees Rankine (°R) = °K x 9/5
Specific Gravity
ammonia = 0.77
asphaltic bitumens = 1.00-1.10
aviation gasolines = 0.70-0.78
benzene = 0.879
butane = 0.599
crude oils = 0.80-0.97
diesel oils = 0.82-0.92
ethane = 0.446
ethylene = 0.610
fuel oils = 0.92-0.99
gas oils = 0.82-0.90
kerosenes = 0.78-0.84
lubricating oils = 0.85-0.95
methanol = 0.7924
motor gasolines = 0.71-0.79
naphtha = 0.885
n-pentane = 0.62624
propane = 0.531
propylene = 0.5139
sulfur = 2.06
toluene = 0.866
xylene = 0.86
Petroleum Specific Gravity (15.6°C)
°API Specific Gravity bbl/tonne
25 0.904 6.98
26 0.898 7.02
27 0.893 7.06
28 0.887 7.22
29 0.882 7.15
30 0.876 7.19
31 0.871 7.24
32 0.865 7.28
33 0.86 7.33
34 0.855 7.37
35 0.85 7.42
36 0.845 7.46
37 0.84 7.51
38 0.835 7.55
39 0.83 7.6
40 0.825 7.64
41 0.82 7.69
42 0.816 7.73
Heating Values
ammonia = 22.315 GJ/tonne
aviation gasoline = 33.518 MJ/L
aviation turbo fuel = 35.934 MJ/L
benzene = 41.914 GJ/tonne
butane (liquid) = 29.475 GJ/m3
coal = imported bituminous – 29.527 GJ/tonne = Canadian bituminous – 29.993 GJ/tonne = sub-bituminous – 19.763 GJ/tonne = lignite – 15.345 GJ/tonne
coke = 28.830 GJ/tonne
coke oven gas = 18.614 MJ/L
crude oil = 5.81 MMbtu/bbl = 38.512 MJ/L = 38.512 GJ/m3
diesel fuel = 38.675 MJ/L
electricity = 3.6 MJ/kWh
ethane (liquid) = 18.36 GJ/m3
ethylene = 49.469 GJ/tonne
heavy fuel oil = 41.727 MJ/L
kerosene = 37.676 MJ/L
light fuel oil = 38.675 MJ/L
methanol = 22.322 GJ/tonne
motor gasoline = 34.656 MJ/L
naphtha = 34.656 GJ/m3
natural gas – 1 MMBtu/Mcf = 37.229 kJ/L =37.229 MJ/m3
pentanes-plus = 35.17 GJ/m3
petroleum coke = 42.376 MJ/L
propane (liquid) = 25.53 GJ/m3
propylene = 25.53 GJ/m3
still gas = 41.727(1) MJ/L
sulfur = 9.337 GJ/tonne
toluene = 42.433 GJ/tonne
xylene = 42.987 GJ/tonne

* denotes exact conversion measurements

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