Longitud
1 m = 3.28 ft = 39.36 in
1ft = 12 in = 0.305 m
1 in = 25.4 mm

Superficie
1 m2 = 10.764 sq.ft
1 sq.in = 6.45 cm2 = 645 mm2

Peso
1 kg = 2.205 lb
1 lb (pound) = 0.454 kg = 16 oz

Presión
1 kg/cm2 = 1 at = 10 m di H2O = 14.2 psi
1 psi = 0.0703 kg/cm2

Momento de torsión
1 kgm = 7.233 ft.lb
1 lb.ft = 0.138 kgm

Nota: Mt in kgm (N in Hp, n in g/min)

Trabajo
1 kWh = 860 kcal
1 kcal = 0.0011627 kWh
1 kcal = 3.968 B.T.U.
1 B.T.U. = 0.252 kcal =107.65 kgm
1 B.T.U. = 0.0049 kWh
1 kcal = 427 kgm

Potencia
1 Hp = 75 kgm/s
1 Hp = 0.736 kW
1 kW = 1.36 Hp
1 kW = 102 kgm/s

Calor
1 B.T.U. = 0.252 kcal
1 kWh = 860 kcal
1 kcal = 3.968 B.T.U.

Densidad
1 lb./cu.ft. = 0.01602 kg/dm2
1 kg/dm2 = 62.43 lb./cu.ft.