Other than Rhythm, NFP is 96% - 99% method effective in avoiding a pregnancy. NFP is up to 99% method successful in spacing or limiting pregnancy when couples understand the method, are motivated to follow the method, and are taught by competent teachers. Archdiocese of Detroit NFP teachers are certified according to the Standards for Diocesan Natural Family Planning Ministry with a program of the committee for Pro-Life Activities with the United States Conference of Catholic Bishops.
It is necessary for couples to carefully follow the rules of the NFP method to achieve their family planning intention. Those who are strongly motivated to avoid pregnancy, and who follow the method strictly, find NFP very effective.