Glas-charn is a Graham of 633.3 m in Highland. All four of its nearest neighbours are higher, up to Sgurr an Utha at 796 m.
It sits below Sgurr an Utha, only 3.9 km to the east and 162.7 m higher. On the Grahams height ladder it sits between Beinn Ghobhlach (634.9 m) and Tullich Hill (633.1 m). Its nearest higher summit, Sgurr an Ursainn West Top (745.6 m, 3.6 km north-east), is a listed top not profiled here. It is 232.4 m below the average height of the 427 register hills in Highland.