< < < Back to Main Page SI METRIC CONVERSION FACTORS Society of Petroleum Engineers
The list below includes SI Metric conversion factors for common engineering units.

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
A 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 1.589 873 E - 01 = m3
Btu x 1.055 056 E + 00 = kJ
Ci x 3.7* E + 10 = Bq
cp x 1.0* E - 03 = Pa.s
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
oF (oF - 32)/1.8 = oC
oF (oF + 459.67)/1.8 = K
gal(U.S. liq) 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 + 06 = 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 (U.S. fl) 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
Courtesy: JPT, Journal of Petroleum Technology
*Conversion factor is exact.
These conversion factors are from The SI Metric System of Units and SPE Metric Standard, SPE, Richardson, Texas (1984).
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