The church has a circular plan, with a worship space said to measure roughly eighteen metres square and a maximum ceiling height of around ten metres. Sources differ slightly on seating capacity, with figures of 240 and 350 both recorded, so visitors should not rely on either as definitive. The floor slopes gently towards the altar, echoing the arrangement found in Linköping Cathedral.
A free-standing limestone altar stands against the south wall, overhung by a large iron corona created by the sculptor Elis Nordh, its arms symbolising the four evangelists. Behind the altar is a wooden altarpiece centred on a figure of Christ, with scenes from his life carved on the side panels, and a sacrament cupboard set beneath.
Other notable furnishings include a limestone font decorated with an incised dove, a woodcut altar painting, and a round stained-glass window by the artist Bo Beskow. A crucifix carved by an Åland sculptor takes a medieval crucifix as its model, while a chancel carpet from 2002 carries symbols of the dove, olive branch and fish. The church's mechanical organ, built by Nils Hammarberg of Gothenburg, was the building's first organ.
A free-standing bell tower holds two bells cast at the Bergholtz foundry in Sigtuna. Before the present church was built, a temporary 'travelling church', designed to be easily assembled and dismantled, stood on the site through the 1960s and into the 1970s; once Berga kyrka opened, it was relocated and re-consecrated as Vidingsjö church later in 1978.