Divide by 1,000. Hence 1000 ma = 1A.
http://wiki.answers.com/Q/What_is_the_formula_to_c...

500 milliamps is equal to .5
http://www.chacha.com/question/whatis500milliam...

There are 100 milliamps in an amp. Amps are units used to measure electric current. A normal circuit in a house averages 15 to 50 amps.
http://answers.ask.com/Reference/Other/how_many_mi...
