Brim Fell stands to the west of Coniston village in the Southern Fells, at an elevation of 796 m (2,612 ft) above sea level with a prominence of around 25 m (82 ft). Brim Fell’s parent peak is the Old Man of Coniston, and it is listed in its own right as a Nuttall. It is one of the peaks falling in the northern section of the Coniston (or Furness) Fells and was therefore listed by Wainwright as one of his 214 Lakelands Fells. He classified the remaining lower fells to the south as outlying fells.
The summit is strictly merely part of the ridge that runs from the Old Man of Coniston to Swirl How, and Brim Fell itself has no footing in the valley on either side. The ridge itself tends to limit the view in the foreground, but there are otherwise good views across the Lakeland district. At the summit, there is a conical slate cairn on a small grassy plateau. A second cairn lies to the north east.
Most walkers visit Brim Fell’s summit while crossing from the Old Man of Coniston to Swirl How, but there are direct routes, the easiest of which is from Coniston village, climbing via Levers Water Beck to Levers Hawse. Wainwright’s round of the Coniston Fells starts with Dow Crag and the Old Man of Coniston before ascending Brim Fell and continuing onto Swirl How and Wetherlam before returning to the village of Coniston.