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APPENDIX A

Unit Conversion Factors

To U.S.
Quantity U.S. Field Unit To SI Unit Field Unit SI Unit
Length feet (ft) 0.3084 3.2808 meter (m)
mile (mi) 1.609 0.6214 kilometer (km)
inch (in) 25.4 0.03937 millimeter (mm)
Mass ounce (oz) 28.3495 0.03527 gram (g)
pound (lb) 0.4536 2.205 kilogram (kg)
lbm 0.0311 32.17 slug
3 3
Volume gallon (gal) 0.003785 264.172 meter (m )
3
3
3
cu. ft (ft ) 0.028317 35.3147 meter (m )
3
3
barrel (bbl) 0.15899 6.2898 meter (m )
3
Mcf (60°F, 28.317 0.0353 Mm 15°C
4.7 psia) (101.325 kPa)
(M = 1,000)
2
2
Area acre 4.0469 × 10 3 2.471 × 10 −4 meter (m )
2
2
2
sq. ft (ft ) 9.29 × 10 −2 10.764 meter (m )
sq. mile 2.59 0.386 (km) 2
2
Pressure lb/in (psi) 6.8948 0.145 kPa (1,000 Pa)
psi 0.0680 14.696 atm
psi/ft 22.62 0.0442 kPa/m
inch (Hg) 3.3864 × 10 3 0.2953 × 10 −3 Pa
Temperature Fahrenheit (°F) 0.5556 (°F – 32) 1.8C + 32 Celsius (°C)
Rankine (°R) 0.5556 1.8 Kelvin (K)
Energy (work) Btu 252.16 3.966 × 10 −3 cal
Btu 1.0551 0.9478 kilojoule (kJ)
ft-lbf 1.3558 0.73766 joule (J)
hp-hr 0.7457 1.341 kW-hr
Viscosity cp 0.001 1,000 Pa·s
lb/ft-sec 1.4882 0.672 kg/(m-sec) or
(Pa·s)
2 2
lbf-s/ft 479 0.0021 dyne-s/cm
(poise)
2
Thermal Btu-ft/hr-ft -°F 1.7307 0.578 W/(m·K)
conductivity
Specific heat Btu/(lbm-°F) 1 1 cal/(g-°C)
Btu/(lbm-°F) 4.184 × 10 3 2.39 × 10 −4 J (kg-K)
Density lbm/ft 3 16.02 0.0624 kg/m 3

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