Tools
Free calculators
Quick, private estimates for every stage, from your next period to your due date. Nothing you enter leaves your browser.
Updated
In short
What do the Gyne calculators do?
Gyne's 15 free calculators cover your cycle, early pregnancy and pregnancy: your next period, cycle phases and regularity, ovulation, implantation, when to test, hCG doubling time, conception and due dates, pregnancy weeks, IVF and ultrasound dating, weight gain and contractions. Each runs in your browser, explains its method, cites its sources and gives estimates, not a diagnosis or birth control.
Your cycle and periods
- Period calculatorPredict your next 6 periods, how many days until the next one and whether it's late, from your last period and cycle length. Free and private.
- Menstrual cycle phase calculatorSee the dates of your menstrual, follicular, ovulation and luteal phases and where you are today in your cycle. Free, private, method explained.
- Ovulation and fertile window calculatorEstimate your ovulation day, fertile window and next three periods from your last period and cycle length. Free, private, method explained.
- Cycle length and regularity calculatorEnter your last period start dates to see your average cycle length, how much it varies and whether it falls in the normal range. Free, private.
Fertility and early pregnancy
- Implantation calculatorEstimate when a fertilised egg may implant, 6 to 12 days after ovulation, from your last period or ovulation date. Free, private, sources cited.
- When to take a pregnancy testFind out when a home pregnancy test is reliable, from your last period or the date you had sex. Free and private, following NHS guidance.
- Beta hCG doubling time calculatorWork out the doubling time and 48-hour rise between two blood hCG results, compared with what research found in early pregnancies. Free, private.
- Conception date calculatorEstimate your likely conception date and the days sex most likely led to pregnancy, from your last period or your due date. Free and private.
Pregnancy
- Due date calculatorEstimate your due date, how many weeks pregnant you are and your trimester from the first day of your last period. Free and private.
- How many weeks pregnant am I?Find out how many weeks pregnant you are, your trimester, month and days to go, from your last period or due date. Free, private, method explained.
- Pregnancy weeks to months calculatorConvert weeks of pregnancy into months and trimesters, with a full week-by-week chart and how much time is left until 40 weeks. Free and private.
- IVF and FET due date calculatorCalculate your IVF or FET due date from your embryo transfer date and embryo age, or from egg retrieval or IUI, as ACOG recommends. Free, private.
- Due date by ultrasound calculatorWork out your due date from a scan, using the age on the report or crown-rump length, and see if ACOG would change your date. Free and private.
- Pregnancy weight gain calculatorSee the recommended pregnancy weight gain for your BMI, for one baby or twins, and how your gain so far compares by week. IOM guidelines. Free.
- Contraction timerTime your contractions with one button and see their length, how far apart they are and when NHS guidance says to call your midwife. Free.
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