The Protestant Church in West Indonesia is a Reformed Church, its theology based on the teaching of John Calvin. It was established in October 31, 1948. It was called the De Protestantse Kerk in Westelijk Indonesie. In its formative years it consisted of seven classes: Jabar, Java, Jatim, Sumatra, Bangka, Borneo, Sulawesi. It is a member of the World Communion of Reformed Churches the World Council of Churches and the Christian Conference in Asia.
The denomination has 600 000 members and 300 congregations and 430 pastors in 2006. It is a national multi-ethnic church, scattered over 25 out of the 32 provinces of Indonesia.
The denomination is one of the biggest Protestant churches in Indonesia and is part of the Protestant Church in Indonesia.
According to the recent statistics the church is growing rapidly, has 1,305,000 adherents and members. The Synod Office is located in Jakarta.