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Fuel Conversion Factors, NZ CAAFuel Conversion
Fuel Conversion Factors, NZ CAA

Conversion Factors, SI Units

The pilot will perform a number of calculations during preflight planning and the one we used on the site are listed below for convenient access. Sometimes the use of a special aviation calculator (E6B models or electronic Jeppesen) is required.

Previous article discussed the formula's used in aviation calculations but sometimes we need to convert between different systems be that volumes, densities or mass. The table below shows some of the common ones used. For common fuel conversion see the image to the right. We also provide the most commonly used prefixes that are used with these base units.

Conversion tables

Using these conversions is quite simple. For example: to convert 150 US gal to liters is 150 x 3.785 = 567.75 liters. If you want to convert from liters to US gal then divide the number of liters by the conversion factor.

Volume, SI unit cubic meter (m3)
Convert from: To: Multiply by:
m3ft335.315
in3cm316.387
US Galliters3.785
UK Gal (Imperial)liters4.546
US Galm33.785 x 10-3
UK Gal (Imperial)m34.546 x 10-3



Mass (Weight), SI unit kilogram (kg)
Convert from: To: Multiply by:
kglb2.2046
lbg4.536 x 102



Pressure, SI unit Newton/square meter (N/m2)
Convert from: To: Multiply by:
N/m2 (pa)bar10-5
lbf/in2 (psi)N/m2 (pa)6.895 x 103
lbf/in2hPa (mbar)68.948
kgf/cm2N/m9.807 x 104
inHghPa (mbar)33.864
BarPa (N/m2)105



Energy / Power / Heat flow SI unit Watt (W)
Convert from: To: Multiply by:
hpkW0.7457
ft.lbf/sW1.3558
Btu/hrW0.2931
kWhMJ3.6
calJ4.1868
BtukJ1.055
BtukWh2.9307 x 10-4

Prefixes

Sometimes I see these prefixes not being used in the correct way. For example: the use of the kilo prefix is being mistakenly written as K (which is Kelvin) where it should be k (lower case). The table below shows them with their factor.

Commonly used Metric prefixes with SI base units
Prefix Symbol Factor
YottaY1024
ZetaZ1021
ExaE1018
PetaP1015
TeraT1012
GigaG109
MegaM106
kilok103
hectoh102
decada101
decid10-1
centic10-2
millim10-3
microμ10-6
nanon10-9
picop10-12
femtof10-15
attoa10-18
zeptoz10-21
yoctoy10-24

More commonly used conversions can be found on websites like onlineconversion.com and wikipedia.

Written by EAI.


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