How much weight can an ant lift?
Ants can lift anywhere from 20 to 50 times their body weight. The smallest ant that I know of weighs about 0.00001 g, or 0.000000022 lbs. An average ant weighs about 0.004 grams, or 0.0000088 lbs. The largest ant measures up to 3.3 cm and (complete guess) weighs about 0.4 g. So figure that an ant can lift, for smallest, average, largest, can lift at least 0.002 g, 0.08 g and 8 g, respectively; and at most 0.005 g, 0.2 g, 20 g, respectively. Sources: http://ant.edb.miyakyo-u.ac.jp and http://www.ewebtribe.