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7.10 Conversion Factors
7.10.1

If dual units are provided for all units used in an article, paper, or
book, (including those in figures and tables) no conversion factor table
is needed.

7.10.2

If only one system of units is used (customary or metric) then a
conversion factor table must be included at the end of the article, paper,
or each chapter of the book. The table should include conversion factors
for all units used, including those used in figures and tables.

Example Conversion Table

SI Metric Conversion Factors


bbl x 1.589 873 E-01 = m3 
ft x 3.048* E-01 = m 
hp x 7.460 43 E-01 = kW 
*Conversion factor is exact.
7.10.3

The list below includes SI Metric conversion factors for common
engineering units. The SI Metric System of Units and SPE Metric Standard,
the Society's official standard, is available from SPE Book Order Dept.,
P.O. Box 833836, Richardson, TX 75083-3836.


acre x 4.046 873 E + 03 = m2 
acre x 4.046 873 E - 01 = ha 
acre-ft x 1.233 489 E + 03 = m3 
ampere-hr x 3.6* E + 03 = C 
Å x 1.0* E - 01 = nm 
ºAPI 141.5/(131.5+ºAPI)= g/cm3 
atm x 1.013 250* E + 05 = Pa 
bar x 1.0* E + 05 = Pa 
bbl x 1.589 874 E - 01 = m3 
Btu x 1.055 056 E + 00 = kJ 
Ci x 3.7* E + 10 = Bq 
cp x 1.0* E - 03 = Pas 
cycles/sec x 1.0* E + 00 = Hz 
dyne x 1.0* E - 02 = mN 
eV x 1.602 19 E - 19 = J 
ft x 3.048* E - 01 = m 
ft2 x 9.290 304* E - 02 = m2 
ft3 x 2.831 685 E - 02 = m3 
ºF (ºF - 32)/1.8= ºC 
ºF (ºF + 459.67)/1.8= K 
gal x 3.785 412 E - 03 = m3 
hp x 7.460 43 E - 01 = kW 
hp-hr x 2.684 520 E + 00 = MJ 
in. x 2.54* E + 00 = cm 
in.2 x 6.451 6* E + 00 = cm2 
in.3 x 1.638 706 E + 01 = cm3 
kip x 4.448 222 E + 03 = N 
knot x 5.144 444 E - 01 = m/s 
ksi x 6.894 757 E + 03 = kPa 
kW-hr x 3.6* E + 00 = J 
lbf x 4.448 222 E + 00 = N 
lbm x 4.535 924 E - 01 = kg 
mL x 1.0* E + 00 = cm3 
mho x 1.0* E + 00 = S 
mile x 1.609 344* E + 00 = km 
oz x 2.957 353 E + 01 = cm3 
psi x 6.894 757 E + 00 = kPa 
psi2 x 4.753 8 E + 01 = kPa2 
sq mile x 2.589 988 E + 00 = km2 
stokes x 1.0* E - 04 = m2/s 
ton x 9.071 847 E - 01 = Mg 
ton (metric) x 1.0* E + 00 = Mg 
tonf x 8.896 444 E + 03 = N 
tonne x 1.0* E + 00 = Mg 
*Conversion factor is exact