1 subcategory · 21 calculators
Use this hub when the question is about fertile windows, due dates, or pregnancy timing. It helps users choose the right calculator for ovulation, natural-conception due dates, and IVF-based timelines before they rely on an estimate.
Featured calculators
Start with these tools if you want the fastest route into the most common decisions in this topic.
Use this ovulation calculator to estimate ovulation day, fertile window, most fertile days, LH-testing start, milestone dates, common-cycle comparisons.
Why click this one
The best first stop when the user needs a fertile-window estimate from cycle timing.
Estimate pregnancy due date from last period, conception date, a known estimated due date, or a dating scan, with gestational age, trimester.
Why click this one
Best for LMP- or conception-based due-date estimates and pregnancy-week context.
Calculate an IVF transfer-based due date from embryo transfer date and embryo age, then review gestational age, gestational age at transfer, equivalent LMP.
Why click this one
Useful when embryo transfer timing changes the assumptions behind the estimate.
Health / Women's Health / Fertility & Pregnancy
Use this birth control calculator to compare birth control effectiveness, pregnancies per 100 users per year, multi-year pregnancy risk, STI notes.
Health / Women's Health / Fertility & Pregnancy
Use this basal body temperature calculator to adjust a BBT reading for wake-time differences, compare it with ovulation chart ranges.
Health / Women's Health / Fertility & Pregnancy
Estimate likely ovulation timing, OPK start, fertile days.
Health / Women's Health / Fertility & Pregnancy
Estimate conception date and fertile window from last menstrual period, cycle length, luteal phase, known due date, known conception date.
Health / Women's Health / Fertility & Pregnancy
Estimate how many mature eggs may need to be frozen for one or more future births, with age-based success assumptions, confidence-target planning.
Body Metrics
BMI, body-fat, body-size, and screening-ratio calculators.
Nutrition
Calories, macros, hydration, and body-composition planning tools.
Hydration
Water intake and hydration target calculators.
Fitness
Performance, exercise output, heart-rate, and pacing calculators.
Women's-health timing searches often sound similar even when the user needs a different model. Ovulation calculators work from cycle timing. Due-date calculators work from last period, conception date, or embryo transfer timing. Pregnancy timeline tools help users orient around milestones once the date is set. This hub separates those use cases so the user can choose the method that matches the underlying timeline question.
Which fertility or pregnancy calculator should I use?
These are for planning around the cycle, not for confirming pregnancy.
They work best when the user needs an estimated due date and gestational timeline.
Embryo-transfer timing can shift the logic enough that a standard due-date calculator is the wrong choice.
Timing-tool comparisons
They solve different parts of the fertility and pregnancy journey.
The starting assumptions are different enough that using the wrong tool can shift the result.
They are useful for milestones and planning, not for confirming gestational age clinically.
Guides for this topic
Use these guides when you want context, not just a result box.
From ovulation to due date — use our calculators to track your pregnancy week by week and understand healthy weight gain along the way.
Why this guide matters
Adds milestone context once the user has an estimated due date.
Track your menstrual cycle with more confidence, understand what counts as normal, estimate ovulation, and learn when symptoms deserve medical advice.
Why this guide matters
Useful background when the user needs cycle context before trusting an ovulation estimate.
Common questions
Due date calculation from LMP (last menstrual period) uses Naegele's rule — adding 280 days to the first day of the last period. This assumes a 28-day cycle and ovulation on day 14. Only about 4–5% of babies are born on their exact estimated due date. First-trimester ultrasound is the most accurate method for confirming gestational age.
No. These calculators estimate dates and windows based on your cycle inputs — they cannot determine whether conception has occurred or confirm a pregnancy. For a pregnancy test, use a home test kit or see a healthcare provider.
Yes. Standard due date calculation assumes a 28-day cycle. If your cycle is consistently shorter or longer, the due date calculator adjusts the ovulation estimate accordingly, shifting the due date by the difference. A cycle length input field allows you to customise this.
