16 oz. in a pound. 500 gms in a pound. 8 oz. is half a pound. 250 gms. is a half pound. 4oz. is a quarter of a pound. 125 gms is a quarter of a pound. 2 oz is a third of a pound.
http://wiki.answers.com/Q/How_many_grams_is_a_half...

1 ounce is equal to 28.3495231 grams, so a half of an ounce is equal
http://www.chacha.com/question/whatdoesahalfou...

There are 28.3 grams in one ounce. However, 1 fluid ounce of water weighs 29.6 grams.
http://www.kgbanswers.com/howmanygramsareinan...

There are 14.1747615625 grams in a half ounce of weed. An ounce has 28.349523125 grams. One quarter of an ounce of weed has 7 grams and 1/8 of an ounce has 3.5 grams.
http://answers.yahoo.com/question/index?qid=201307...
