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Carey had for many years had an interest in worldwide mission and his avocation of the sending of missionaries to convert the heathen was unusual in an age when much of the church believed that missions had died with the apostles. His interest in mission once led him to make an inventory naming every place in the world and its religion. From that he calculated there were 731million people in the world, of which 421 million were pagans.
Carey achieved much in India, he founded mission schools, conceived the idea for a college to train native church leaders and campaigned against widow burning, infanticide and assisted suicide. In addition he developed a vast library system, printed the first Indian language newspaper, and introduced the idea of saving banks. He is considered to be a pioneer of the modern missionary movement and laid the foundation for many succeeding missionaries in India. A legacy of his trailblazing work, is that by the end of the nineteenth century there were over half a million native Indian Protestants.