Medidas = Mesures ( Poids = Peso )

Poids- Peso - Weight

1000 kg = 1 tonelada = 1 tonne = 1 metric ton
1 kg = 1000 g
1  g  = 1000 mg

1 grain = 0.0022857143 ounces (avoirdupois')
1 grain = 0.0647981 g
1 g = 15.432358 grains

1 ounce (oz) (avoirdupois') = 16 drams (dr) (avoirdupois weight) = 7.291666 drams (apothecaries' weight) = 28.349523 g
1 ounce (apothecaries' or troy) (oz t) = 8 drams (apothecaries') = 17.554286 drams (avoirdupois') = 31.1034768 g
1 g = 0.035273962 oz (avoirdupois')
1 g = 0.0321507 oz (apothecaries' or troy)

1 pound (1 lb) = 16 ounces = 0.45359237 kg
1 pound (avoirdupois') = 0.45359237 kg = 453.59237 g
1 pound (apothecaries' or troy) = 0.37324172 kg = 373.24172 g
1 kg = 2.2046226 lb (avoirdupois')

1 stone (14 lb) = 0.14 centals = 6.35029318 kg

1 hundredweight (Brit. cwt.) = 1 hundredweights (long) = 112 pounds = 50.802345 kg
1 U.S. centerweight (U.S. cwt.) = 1 hundredweights (short) = 100 pounds = 45.359237 kg

1 long ton = 2240 lb (England) = 1016.0469 kg
1 short ton = 2000 lb (USA) = 907.18474 kg
1 ton (Sweden) = 1000 kg = 1 tonnes (t) = 1 metric tons

source : http://www.drskantze.com/measurements.htm