Cul Beag is a Corbett of 769.4 m in Highland. Its drop of 546 m is 71% of its height: the col linking it to higher ground is only 223 m above sea level.
It stands 157 m above its nearest neighbour, Stac Pollaidh, 3.8 km to the north-west. On the Corbetts height ladder it sits between Carn Dearg (Highland, NN357948) (769.6 m) and Meallach Mhor (769 m). Its nearest higher summit, Creag nan Calman (829.2 m, 3.2 km north-east), is a listed top not profiled here. The highest point is recorded as rock, not a cairn.