If you have a 35 day cycle you ovulate on day 21, if you have a 34 day cycle you ovulate on day 20, if you have a 33 days cycle you ovulate on day 19, if you have a 32 day cycle you ovulate on day 18, if you have a 31 day cycle you ovulate on day 17, if you have a 30 day cycle you ovulate on day 16, if you have a 29 day cycle you ovulate on day 15, if you have a 28 day cycle you ovulate on day 14, if you have a 27 day cycle you ovulate on day 13, if you have a 26 day cycle you ovulate on day 12, if you have a 25 days cycle you ovulate on day 11, if you have a 24 day cycle you ovulate on day 10 I like to give baby dust to all women who are trying to conceive god bless you