This is one of the smallest of the Wainwrights, being the 210th out of his 214 fells in the Pictorial Guide to the Lakeland Fells. Its elevation is 355 m (1,165 ft) above sea level and its prominence is around 70 m as it rises from Buttermere Valley in the North Western Fells. It is a satellite of Crag Hill.
At the summit is a small cairn on the highest of the rocky outcrops here. While the higher fells surrounding Rannerdale Knotts limit much of the wider view of the Lake District, there is a beautiful view of Buttermere Lake and village, with Great Gable providing an impressive backdrop. A few steps to the west will allow a view of Crummock Water.
Because of its close proximity to other, larger fells, it is often ascended as part of the Rannerdale Round, a route which starts or ends at Rannerdale Knotts and includes four other Wainwright peaks: Grasmoor, Eel Crag, Wandop and Whiteless Pike. This round of fells can be completed in a long half a day. If wishing to ascend Rannerdale Knotts in isolation, it is a relatively quick and easy walk by following a direct route to the top from Hause Point at Rannerdale on the eastern shore of Crummock Water. A slightly longer route begins at Buttermere, beginning on the path up Whiteless Pike before diverting west-north-west at the col at around 290 m (950 ft).