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Fuel Conversion Factors, NZ CAA

# Conversion Factors

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.

 Convert from: To: Multiply by: m3 ft3 35.315 in3 cm3 16.387 US Gal liters 3.785 UK Gal (Imperial) liters 4.546 US Gal m3 3.785 x 10-3 UK Gal (Imperial) m3 4.546 x 10-3

 Convert from: To: Multiply by: kg lb 2.2046 lb g 4.536 x 102

 Convert from: To: Multiply by: N/m2 (pa) bar 10-5 lbf/in2 (psi) N/m2 (pa) 6.895 x 103 lbf/in2 hPa (mbar) 68.948 kgf/cm2 N/m 9.807 x 104 inHg hPa (mbar) 33.864 Bar Pa (N/m2) 105

 Convert from: To: Multiply by: hp kW 0.7457 ft.lbf/s W 1.3558 Btu/hr W 0.2931 kWh MJ 3.6 cal J 4.1868 Btu kJ 1.055 Btu kWh 2.9307 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 where it should be k (lower case). The table below shows them with their factor.

 Prefix Symbol Factor Yotta Y 1024 Zeta Z 1021 Exa E 1018 Peta P 1015 Tera T 1012 Giga G 109 Mega M 106 kilo k 103 hecto h 102 deca da 101 deci d 10-1 centi c 10-2 milli m 10-3 micro μ 10-6 nano n 10-9 pico p 10-12 femto f 10-15 atto a 10-18 zepto z 10-21 yocto y 10-24

More common conversions can be found on webistes as onlineconversion.com and wikipedia.