Area
1 mm² = 0.001550 in²
1 m² = 10.76 ft² = 1550 in²

Acceleration
1 m/s² = 3.281 ft/s² = 39.37 in/s²
1 g = 32.17 ft/s² = 9.807 m/s²
  (average at earth's surface)

Mass
1 kg = 0.0685 slug
1 t (metric tonne) = 1,000 kg = 68.5 slug

Force
1 N = 0.2248 lb
1 kN = 0.2248 kip = 224.8 lb

Power
1 W = 1 N-m/s = 0.7376 ft-lb/s
1 W = 0.001341 hp

Time
1 min = 60 s
1 hr = 60 min = 3,600 s
1 day = 24 hr = 86,400 s

Density
1 kg/m³ = 0.001940 slug/ft³

Temperature
T_C = (5/9) (T_F - 32)
T_K = T_C + 273.15 (Kelvin)

Pressure
1 Pa = 1 N/m² = 0.0209 lb/ft² = 1.45×10^-4 psi
1 bar = 100,000 Pa
1 MPa = 1,000 kPa = 0.1450 ksi
1 GPa = 1,000 MPa = 0.1450 msi
1 atm = 101.3 kPa = 760 mmHg

Length
1 m = 3.281 ft = 39.37 in.
1 km = 0.6214 mi

Volume
1 mm³ = 6.102×10^-5 in³ = 3.531×10^-8 ft³
1 m³ = 6.102×10⁴ in³ = 35.31 ft³
1 liter = 0.2642 gal
1,000 liter = 1 m³

Velocity
1 m/hr = 3.281 ft/hr
1 km/hr = 0.2778 m/s = 0.6214 mi/hr = 0.9113 ft/s

Work/Energy
1 J = 1 N-m = 0.7376 ft-lb

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