Area
1 in² = 645.2 mm²
1 ft² = 144 in² = 0.09290 m²

Acceleration
1 ft/s² = 0.3048 m/s²
1 g = 32.17 ft/s² = 9.807 m/s²
  (average at earth's surface)

Mass
1 slug = 14.59 kg

Force
1 lb = 4.448 N
1 kip = 1000 lb = 4448 N
1 ton = 2000 lb = 8896 N

Power
1 ft-lb/s = 1.356 W
1 hp = 550 ft-lb/s = 746 W

Time
1 min = 60 s
1 hr = 60 min = 3600 s
1 day = 24 hr = 86,400 s

Density
1 slug/ft³ = 515.4 kg/m³

Temperature
T_F = (9/5) T_C + 32
T_R = T_F + 459.67 (Rankine)

Pressure
1 lb/in² (psi) = 144 lb/ft² = 6895 Pa
1 lb/ft² = 0.006944 lb/in² = 47.88 Pa
1 ksi = 1,000 psi = 6,895 kPa = 6.895 MPa
1 msi = 1×10⁶ psi = 6,895 MPa = 6.895 GPa
1 atm = 14.70 psi = 760 mmHg

Length
1 ft = 12 in. = 0.3048 m
1 mi = 5280 ft = 1.609 km
1 nautical mile = 6076 ft = 1.852 km

Volume
1 in³ = 16,390 mm³ =1.639×10^-5 m³
1 ft³ = 0.02832 m³
1 gal = 3.7854 liter = 0.1337 ft³

Velocity
1 mi/hr = 1.467 ft/s = 1.609 km/hr = 0.4470 m/s
1 knot = 1 nautical mile/hr = 1.689 ft/s = 0.5144 m/s

Work/Energy
1 ft-lb = 1.356 J = 1.356 N-m

Angle
1 rad = 180/π deg = 57.30 deg
1 deg = π/180 rad = 0.01745 rad
1 rev = 2π rad = 360 deg
1 rev/min (rpm) = 0.1047 rad/s