Use this ovulation predictor to determine the best time to get pregnant. Results for the next four calendar months are generated, showing your range of most fertile days.

First Day of Last Menstrual Period JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember  12345678910111213141516171819202122232425262728293031  2008200920102011 Average Length of Cycle 20 day cycle 21 day cycle 22 day cycle 23 day cycle 24 day cycle 25 day cycle 26 day cycle 27 day cycle 28 day cycle 29 day cycle 30 day cycle 31 day cycle 32 day cycle 33 day cycle 34 day cycle 35 day cycle 36 day cycle 37 day cycle 38 day cycle 39 day cycle 40 day cycle 41 day cycle 42 day cycle 43 day cycle 44 day cycle 45 day cycle

Already pregnant? Use our due date calculator to predict your child's birth date, along with tons of fun birthday facts about your baby!

First Day of Last Menstrual Period JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember  12345678910111213141516171819202122232425262728293031  2008200920102011

Know your due date? Enter it here to follow your baby's development from conception to birth. Find out exactly what's going on with your body, week by week, trimester by trimester. Our pregnancy calculator also provides tips on helping you have a healthy pregnancy, as well as advice on what to expect when baby arrives. Calendar will be based upon a 42-week pregnancy, beginning at LMP. Enter Your Due Date: JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember  12345678910111213141516171819202122232425262728293031  2008200920102011