Unit Conversion Factors

Area
1 in² = 6.4516 cm²
1 ft² = 0.0929 m²

Crude Oil Volume (Liquid)
1 oz = 29.574 ml
1 gal (US) = 3.785 l
1 gal (Imp) = 4.546 l
1 barrel = 42 gal (US)

Density
1 lbf/in³ = 27.68 g/cm³

Force
1 lbf = 4.448 N
1 lbf = 32.174 poundals
1 N = 0.225 lbf
1 ton (short) = 907.2 kg
1 ton (long) = 1016.0 kg
1 lb/ft² = 47.880 N/m²

Length
1 in. = 25.4 mm
1 ft = 0.3048 m
1 fathom = 6 ft
1 mile = 1.609 km
1 nautical mile = 1.852 km

Mass
1 lbm = 0.4536 kg
1 slug = 32.174 lbm
1 slug = 1 lbf*sec²/ft

Pressure or Stress
1 psi = 6895 Pa
1 psi = 68947 dyne/cm²
1 psi = 0.0703 kg/cm²
1 psi = 0.0685 bar
1 psi = 0.0680 atm
1 psf = 47.88 Pa
1 psf = 4.882 kg/m²

Volume
1 in³ = 16.387 cm³
1 ft³ = 0.028317 m³