Petroleum Engineering Database including abbreviations and dictionary
You are here Home » Oil & Gas Unit Converter
▶ Convertor of 'Length' units:
mm
( Millimeter )
Millimeter is a unit of length in the metric system, equal to one thousandth of a meter or one
tenth of a centimeter.
cm
( Centimeter )
Centimeter is a unit of length in the metric system, equal to one hundredth of a meter.
m
( Meter )
Meter is the base unit of length in the International System of Units SI.
km
( Kilometer )
Kilometer is a unit of length in the metric system, equal to one thousand meters.
in
( Inch )
Inch is a unit of length in the British-imperial and United States customary systems
of measurement. It is now formally equal to 1⁄36 yard but usually understood as 1⁄12 of a foot.
ft
( Feet )
Foot is a unit of length in the imperial and US customary systems of measurement. Since 1959, both
units have been defined by international agreement as equivalent to 0.3048 meters exactly. In
both systems, the foot comprises 12 inches and three feet equal a yard.
Feet plus inches...
Yard
( yd )
Yard is an English unit of length, in both the British imperial and US customary systems of
measurement, that comprises 3 feet or 36 inches. It is by international agreement in 1959
standardized as exactly 0.9144 meters.
Mile
( Land mile - Statute mile - SM )
Mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and
standardized as exactly 1,609.344 meters by international agreement in 1959.
Nautical mile
( Nautical mile NM - shipping mile )
A nautical mile is a unit of measurement defined as 1,852 meters. Historically, it was defined
as one minute of latitude, which is equivalent to one sixtieth of a degree of latitude. It is a
non-SI unit accepted for use with the SI, and rounded to an even number of meters for its continued
use in both air and marine navigation, and for the definition of territorial waters.
1/64th of inch
( 1/64th of an inch )
This unit is used to express the size of chokes or bean sizes.

▶ Convertor of 'Area' units:

▶ Convertor of 'Volume' units:

▶ Convertor of 'Mass or Weight' units:

▶ Convertor of 'Pressure' units:

▶ Convertor of 'Temperature' units:

▶ Convertor of the most common units of 'Density & Fluid gradients' in the oil industry.
The ranges of fluid gradients at reservoir conditions are summerized in the 'info' buttons:
g/cm³ - g/cc
( Gram per cubic centimeter )
Fluid gradient range at reservoir conditions in g/cm³: - Gas: 0.12 ~ 0.35 - Sour Gas: 0.2 ~ 0.6
- Condensate: 0.2 ~ 0.55 - Oil: 0.67 ~ 0.95 - Water/filtrate: 0.95 ~ 1.05 - Heavy Oil/Bitumen: 0.98 ~ 1.10
- Mud Fluids: 1.00 ~ 2.00
g/ml
( Gram per milliliter )
kg/l
( Kilogram per liter )
SG (liquid)
( Specific gravity )
g/lit
( Gram per liter )
kg/m³
( Kilogram per cubic meter )
lb/in³ - pci
( Pound per cubic inch )
lb/gal - ppg
( Pound per gallon )
lb/ft³ - pcf
( Pound per cubic feet )
lb/bbl
( Pound per Barrel )
deg API
( deg API )
API is a measure of how heavy or light a petroleum liquid is compared to water: if its API gravity is greater than 10,
it is lighter and floats on water; if less than 10, it is heavier and sinks. API gravity is an inverse measure of a
petroleum liquid's density relative to that of water. The heavier the oil, the lower the API value is and vice versa.
Oil with API greater than 30 is termed light; between 22 and 30, medium; below 22, heavy; and below 10, extra heavy.
Asphalt on average has an API gravity of 8°, Brent Crude of 35.5°, and gasoline of 50°.
Brent Crude has an API gravity of approximately 35-38 which is equivalent to a specific gravity of 0.835. West Texas
Intermediate is a light crude oil, with an API gravity of around 39.6, which is lighter than Brent Crude.
psi/ft
( Gradient: psi per foot )
Fluid gradient range at reservoir conditions in psi/ft: - Gas: 0.05 ~ 0.15 - Sour Gas: 0.10 ~ 0.26
- Condensate: 0.11 ~ 0.24 - Oil: 0.29 ~ 0.41 - Water/filtrate: 0.41 ~ 0.45 - Heavy Oil/Bitumen:
0.42 ~ 0.47 - Mud Fluids: 0.43 ~ 0.87
kPa/m
( Gradient: kilo pascal per meter )
Fluid gradient range at reservoir conditions in kPa/m: - Gas: 1.0 ~ 3.4 - Sour Gas: 2.0 ~ 6.0
- Condensate: 2.0 ~ 5.5 - Oil: 6.5 ~ 9 - Water/filtrate: 9.2 ~ 10.6 - Heavy Oil/Bitumen:
9.5 ~ 10.7 - Mud Fluids: 9.5 ~ 20
bar/m
( Gradient: bar per meter )
Fluid gradient range at reservoir conditions in bar/m: - Gas: 0.011 ~ 0.034 - Sour Gas: 0.024 ~ 0.059
- Condensate: 0.024 ~ 0.055 - Oil: 0.065 ~ 0.093 - Water/filtrate: 0.093 ~ 0.102 - Heavy Oil/Bitumen:
0.095 ~ 0.107 - Mud Fluids: 0.095 ~ 0.21

▶ Unit conversion of the fluid ratios has been sometimes dificult. With this convertor, an engineer can
convert the units of 'Gas Oil Ratio' , 'Solution Gas Oil Ratio' , 'Gas Liquid Ratio' , 'Condensate Gas Ratio' and
'Water Gas Ratio' :

▶ Dynamic Viscosity unit convertor: