As a rule for Boeing Aircraft, you have to be between 5'2 (about 1.58 m) and 6'4" (about 1.9m). As for weight, I don't really know. Most of the pilots I work with are normal in size, but some are 'pleasantly plump' if you know what I mean
.
For comparison I'm 5'9 1/2" ~1.76m without shoes, 5'10 1/2" or about 1.79m with shoes. Weight wise, I come in at 115 to 130 lbs. That's 52.3 kg to 59.1 kg (probably closer to the former). I'm very thin though.
-Nikki