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Free cycle calculators
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Accurate ovulation calculator: use your own cycles, not day 14Accurate ovulation calculator: add your last period dates and luteal phase to estimate your ovulation day from your own average cycle. Free and private.
Clomid ovulation calculator: when will I ovulate on Clomid or letrozole?Free Clomid ovulation calculator: enter cycle day 1 and your first pill day to see when you'll likely ovulate and when to start LH tests. Letrozole too.
Conception calculator: when did I conceive?Conception calculator: enter your due date to find your likely conception date (due date minus 266 days) and the window of days the sex could have happened.
Cycle length calculator: is my cycle normal?Free cycle length calculator: enter the start dates of your last few periods to get your average cycle length and see whether your cycle counts as regular.
Days past ovulation calculator: how many DPO am I?Days past ovulation calculator: enter your ovulation day to see how many DPO you are today, what's happening in your body and when a pregnancy test works.
If I got pregnant this month, when would I be due? Due dates by monthIf you got pregnant in a given month, when would you be due? See a 12-month due date table by conception month, the simple math and a free calculator.Due date calculator based on ovulation: when is my baby due?Due date calculator based on ovulation: enter your ovulation or conception date to get your estimated due date (ovulation + 266 days) and weeks pregnant.Due date calculator: when is my baby due?Free pregnancy due date calculator: enter the first day of your last period and cycle length to see your estimated due date and how many weeks along you are.
Fertile window calculator: when am I most fertile?Free fertile window calculator: see the days each cycle when pregnancy is most likely, for your next 4 cycles. Private, estimates only, not contraception.
hCG doubling time calculator: how fast are my levels rising?hCG doubling time calculator: enter two beta hCG results and the hours between them to see doubling time and 48-hour rise. Your clinic interprets.
Implantation calculator: when does implantation happen?Free implantation calculator: see the days implantation would most likely happen this cycle, what implantation bleeding looks like, and when to test.IVF due date calculator: due date from your embryo transferIVF due date calculator: enter your embryo transfer date and embryo age (day 3, 5 or 6) for your estimated due date. Private, instant, nothing is stored.Luteal phase calculator: how long is my luteal phase?Free luteal phase calculator: enter your ovulation day and next period to see your luteal phase length and whether it sits in the typical 11 to 17 day range.Menstrual cycle calculator: map your whole cycleFree menstrual cycle calculator: see your period, follicular days, fertile window and luteal phase on one color-coded calendar, plus six cycles ahead.
Period mood calculator: how might I feel today?Period mood calculator: find your cycle phase today and the mood people often feel in it, then learn how to build a personal forecast from your own days.Mood tracker printable: chart your mood across your cycleA free mood tracker printable built around your cycle: one row per cycle day, a 1 to 5 mood score and a few symptoms. See your PMS pattern in two months.When is my next period? Work out the date in 10 secondsWhen is my next period? Count it by hand in one step, or let the calculator do it. Plus why the date can move and how many days late is still normal.
Ovulation after miscarriage calculator: when your cycle comes backA gentle ovulation after miscarriage calculator: see when ovulation and your first period may return after a loss or an abortion, plus signs to call a doctor.Ovulation calculator for a 21-day cycleWith a 21-day cycle you usually ovulate around day 7, fertile days 2 to 8. See your exact dates for the next three cycles, free.Ovulation calculator for a 22-day cycleWith a 22-day cycle you usually ovulate around day 8, fertile days 3 to 9. See your exact dates for the next three cycles, free.Ovulation calculator for a 23-day cycleWith a 23-day cycle you usually ovulate around day 9, fertile days 4 to 10. See your exact dates for the next three cycles, free.Ovulation calculator for a 24-day cycleWith a 24-day cycle you usually ovulate around day 10, fertile days 5 to 11. See your exact dates for the next three cycles, free.Ovulation calculator for a 25-day cycleWith a 25-day cycle you usually ovulate around day 11, fertile days 6 to 12. See your exact dates for the next three cycles, free.Ovulation calculator for a 26-day cycleWith a 26-day cycle you usually ovulate around day 12, fertile days 7 to 13. See your exact dates for the next three cycles, free.Ovulation calculator for a 27-day cycleWith a 27-day cycle you usually ovulate around day 13, fertile days 8 to 14. See your exact dates for the next three cycles, free.Ovulation calculator for a 28-day cycleWith a 28-day cycle you usually ovulate around day 14, fertile days 9 to 15. See your exact dates for the next three cycles, free.Ovulation calculator for a 29-day cycleWith a 29-day cycle you usually ovulate around day 15, fertile days 10 to 16. See your exact dates for the next three cycles, free.Ovulation calculator for a 30-day cycleWith a 30-day cycle you usually ovulate around day 16, fertile days 11 to 17. See your exact dates for the next three cycles, free.Ovulation calculator for a 31-day cycleWith a 31-day cycle you usually ovulate around day 17, fertile days 12 to 18. See your exact dates for the next three cycles, free.Ovulation calculator for a 32-day cycleWith a 32-day cycle you usually ovulate around day 18, fertile days 13 to 19. See your exact dates for the next three cycles, free.Ovulation calculator for a 33-day cycleWith a 33-day cycle you usually ovulate around day 19, fertile days 14 to 20. See your exact dates for the next three cycles, free.Ovulation calculator for a 34-day cycleWith a 34-day cycle you usually ovulate around day 20, fertile days 15 to 21. See your exact dates for the next three cycles, free.Ovulation calculator for a 35-day cycleWith a 35-day cycle you usually ovulate around day 21, fertile days 16 to 22. See your exact dates for the next three cycles, free.Ovulation calculator for a 36-day cycleWith a 36-day cycle you usually ovulate around day 22, fertile days 17 to 23. See your exact dates for the next three cycles, free.Ovulation calculator for a 37-day cycleWith a 37-day cycle you usually ovulate around day 23, fertile days 18 to 24. See your exact dates for the next three cycles, free.Ovulation calculator for a 38-day cycleWith a 38-day cycle you usually ovulate around day 24, fertile days 19 to 25. See your exact dates for the next three cycles, free.Ovulation calculator for a 39-day cycleWith a 39-day cycle you usually ovulate around day 25, fertile days 20 to 26. See your exact dates for the next three cycles, free.Ovulation calculator for a 40-day cycleWith a 40-day cycle you usually ovulate around day 26, fertile days 21 to 27. See your exact dates for the next three cycles, free.
Ovulation calculator boy or girl: what timing can (and can't) doOvulation calculator boy or girl: see the Shettles timing dates for your cycle, and what the research says about choosing your baby's sex. Kind and honest.
Ovulation calculator for irregular periods: find your real windowOvulation calculator for irregular periods: enter your last period dates to see the full range of days you could ovulate, plus how to narrow it down. Free.Ovulation calculator: when do I ovulate?Free ovulation calculator: enter your last period and cycle length to see your likely ovulation day for the next 4 cycles. Private, instant, estimates only.Ovulation calendar calculator: your next 3 months at a glanceFree ovulation calendar calculator: see your ovulation day and fertile window for the next 3 cycles on a color-coded calendar. Private, no sign-up, instant.
Ovulation test calculator: when to start testingFree ovulation test calculator: enter your last period and cycle length to see the day to start LH tests, plus the best time of day to test. Any brand.Perimenopause quiz: am I in perimenopause?Perimenopause quiz: a 15-point self-check of cycle, body and mood changes, what your answers might mean, and how to bring them to your doctor.
Period and ovulation calculator: both dates in one placeFree period and ovulation calculator: see your next 6 periods plus this cycle's ovulation day and fertile window on one calendar. Private, nothing is stored.Period calculator: when is my next period?Free period calculator: enter the first day of your last period and your cycle length to see your next 6 periods. Private, instant, nothing is stored.How late is my period? Check in secondsHow late is my period? Enter your last period and cycle length to see exactly how many days late you are, whether that's normal, and what to do next.Printable period tracker: a simple layout you can copyA free printable period tracker layout: what columns to include, how to fill it in, and how to read your chart after three months. Print this page or copy it.
PMDD test: a self-check before you talk to a doctorFree PMDD test: check your premenstrual symptoms against the pattern doctors look for, then learn how a real PMDD diagnosis works and what to bring.
PMS test: do my symptoms follow my cycle?Free PMS test: rate 11 common premenstrual symptoms and see whether yours look like mild PMS, typical PMS or something worth raising with a doctor.
PMS symptom diary: what to track for your doctorHow to keep a PMS symptom diary doctors can use: the daily items, the 1 to 6 rating scale, how long to track, and how to read the chart before your visit.Pregnancy calculator: how far along am I?Pregnancy calculator: enter your last period or due date to see how many weeks and days pregnant you are, your trimester and the days to go. Free and private.Chances of getting pregnant calculator: your odds, day by dayFree chances of getting pregnant calculator: pick the day you had sex and see the odds by day of your cycle, from the classic Wilcox study. Private, instant.When to take a pregnancy test: find your most accurate dayWhen to take a pregnancy test: enter your last period and cycle length to see the earliest testing day and the day a result is most reliable.
Safe days calculator: why calendar safe days can't prevent pregnancyLooking for a safe days calculator? Here's why calendar safe days are unreliable as contraception, what the numbers say, and what works instead.What phase of my cycle am I in? Free phase finderWhat phase of my cycle am I in? Enter your last period to see your cycle day, today's phase and how people often feel in it. Private and instant.