Rüschegg has an area of 57.3 km² (22.12 sq mi).
As of 2012, a total of 23.83 km² (9.20 sq mi) or 41.6% is used for agricultural purposes, while 28.51 km² (11.01 sq mi) or 49.8% is forested.
The rest of the municipality is 1.73 km² (0.67 sq mi) or 3.0% is settled (buildings or roads), 0.84 km² (0.32 sq mi) or 1.5% is either rivers or lakes and 2.5 km² (0.97 sq mi) or 4.4% is unproductive land.

During the same year, housing and buildings made up 1.4% and transportation infrastructure made up 1.3%.
A total of 45.7% of the total land area is heavily forested and 3.8% is covered with orchards or small clusters of trees.
Of the agricultural land, 2.2% is used for growing crops and 11.5% is pasturage and 27.6% is used for alpine pastures.
All the water in the municipality is flowing water.
Of the unproductive areas, 3.2% is unproductive vegetation and 1.1% is too rocky for vegetation.

The municipality is located in the Alpenvorland between the Schwarzwassergraben (elevation 714 m [2,343 ft]) and Ochsen peak (elevation 2,188 m [7,178 ft]) which is part of the Stockhorn chain.
The Ochsen, Bürglen (2,165 m (7,103 ft)) and Gantrisch (2,175 m (7,136 ft)), form the southern border of the municipality.
It includes the villages Heubach, Hirschhorn, Gambach and Graben.

The neighboring municipalities are Rüeggisberg, Rüti bei Riggisberg, Därstetten, Oberwil im Simmental, Guggisberg and Wahlern.

On 31 December 2009 Amtsbezirk Schwarzenburg, the municipality's former district, was dissolved.
On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Bern-Mittelland.
Rüschegg has an area of 57.3 km² (22.12 sq mi). As of 2012, a total of 23.83 km² (9.20 sq mi) or 41.6% is used for agricultural purposes, while 28.51 km² (11.01 sq mi) or 49.8% is forested. The rest of the municipality is 1.73 km² (0.67 sq mi) or 3.0% is settled (buildings or roads), 0.84 km² (0.32 sq mi) or 1.5% is either rivers or lakes and 2.5 km² (0.97 sq mi) or 4.4% is unproductive land.
During the same year, housing and buildings made up 1.4% and transportation infrastructure made up 1.3%. A total of 45.7% of the total land area is heavily forested and 3.8% is covered with orchards or small clusters of trees. Of the agricultural land, 2.2% is used for growing crops and 11.5% is pasturage and 27.6% is used for alpine pastures. All the water in the municipality is flowing water. Of the unproductive areas, 3.2% is unproductive vegetation and 1.1% is too rocky for vegetation.
The municipality is located in the Alpenvorland between the Schwarzwassergraben (elevation 714 m [2,343 ft]) and Ochsen peak (elevation 2,188 m [7,178 ft]) which is part of the Stockhorn chain. The Ochsen, Bürglen (2,165 m (7,103 ft)) and Gantrisch (2,175 m (7,136 ft)), form the southern border of the municipality. It includes the villages Heubach, Hirschhorn, Gambach and Graben.
The neighboring municipalities are Rüeggisberg, Rüti bei Riggisberg, Därstetten, Oberwil im Simmental, Guggisberg and Wahlern.
On 31 December 2009 Amtsbezirk Schwarzenburg, the municipality's former district, was dissolved. On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Bern-Mittelland.
Rüschegg