Countries using Imperial pounds and ounces:
USA, UK, Eire, South Africa, India, Canada, Australia and the some Commonwealth of Nations. inpounds and stobe and stons with klg and onzes much ounches and gramms
A rough guide when you are measuring liquids: 1 ml of water equals 1 gram, 1 litre of water weighs approx 1 kilogram - other liquids may differ.
Wikipedia links covering units of mass show/hide