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Medically reviewed on 5 October 2026 by Dr. Taimoor Asghar.

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Women's Health Calculators

All Women's Health calculators

Medically reviewed by , physician.

In short: Women's health calculators: ovulation, due date, preeclampsia risk, VBAC score, PCOS, EPDS, menopause rating scale and more. Browse the calculators below, each with an interpretation guide.

Women's health spans the reproductive life course, from the first menstrual cycles through fertility, pregnancy, breastfeeding and menopause, along with conditions that disproportionately affect women such as endometriosis, polycystic ovary syndrome and iron deficiency anaemia. The 25 calculators in this library follow that journey: cycle tracking and ovulation prediction, fertility assessment, early pregnancy monitoring, antenatal risk assessment, labour planning, postnatal mental health screening, breastfeeding medication safety, cancer risk estimation, and the menopause transition. They are built for clinicians, midwives and students, and for informed women who want to understand their own results before a clinic appointment.

What women's health covers and which questions these tools answer

Women's health as a field covers reproductive medicine, obstetrics, gynaecology and the sex-specific aspects of general medicine. Its clinical questions are often about timing and risk: when is the fertile window, is this pregnancy progressing normally, what is the chance of preeclampsia, is induction likely to succeed, is a vaginal birth after caesarean likely to be successful, and is this medication safe in pregnancy or breastfeeding. The calculators here give structured answers to those questions.

Fertility and cycle tools form the first group. The menstrual cycle tracker and ovulation calculator predict the fertile window from cycle history; the LH to FSH ratio and the PCOS risk score support the workup of polycystic ovary syndrome; the AMH calculator places anti-Mullerian hormone results in age context for ovarian reserve assessment; and the endometriosis risk estimator combines symptoms and history into a score that guides referral. These tools serve women planning pregnancy, clinicians investigating subfertility or menstrual disorders, and students learning reproductive endocrinology.

Pregnancy tools form the largest group, mirroring antenatal care itself. The due date calculator establishes gestation, the hCG doubling calculator checks early pregnancy rise, the pregnancy weight gain tracker follows Institute of Medicine guidance by pre-pregnancy BMI, and the thyroid interpreter applies pregnancy-specific TSH ranges. Risk assessment is covered by the preeclampsia tool, the HELLP syndrome diagnostic aid, the teratogenic drug checker and the lactation safety checker. Labour planning uses the Bishop score for induction readiness, the VBAC score for counselling about trial of labour after caesarean, and the methotrexate dose calculator for ectopic pregnancy management. Beyond pregnancy, the library covers the Gail-style breast cancer risk models, the RMI for adnexal masses, the EPDS for postnatal depression screening, the FSFI for sexual function, the menopause rating scale for the perimenopause transition, and calcium, vitamin D and iron needs across the life stages.

When clinicians and students reach for these calculators

In general practice and gynaecology clinics, the cycle, fertility and menstrual disorder tools structure the first consultation. A woman presenting with irregular cycles can arrive with tracked data that makes the history taking faster and more accurate; the clinician can then use the PCOS risk score and LH to FSH ratio alongside examination and ultrasound to decide whether Rotterdam criteria are met. The endometriosis estimator helps the GP decide whose pelvic pain warrants gynaecology referral rather than continued watchful waiting, addressing the well-recognised diagnostic delay in endometriosis.

In antenatal care, the pregnancy calculators are used at booking and at every subsequent visit. The due date calculator sets the gestational age that every other decision depends on. The preeclampsia risk assessment at booking identifies women who should start aspirin prophylaxis; the weight gain tracker and thyroid interpreter guide ongoing management; the teratogenic drug checker is consulted whenever a pregnant woman needs a new prescription. In early pregnancy units, the hCG doubling calculator helps interpret serial levels in pregnancies of unknown location, and the methotrexate tool supports the medical management of ectopic pregnancy with correct weight-based dosing and follow-up scheduling.

Labour ward and postnatal settings use the planning and screening tools. The Bishop score is assessed before induction to counsel the woman about the likelihood of success and the possible need for cervical ripening; the VBAC score structures the antenatal discussion about trial of labour versus repeat caesarean, balancing the woman's preferences against her individual chance of success. After birth, the EPDS is the standardised screen for postnatal depression used by midwives, health visitors and GPs, and the lactation checker answers the daily question of whether a needed medication is compatible with breastfeeding. In midlife clinics, the menopause rating scale quantifies symptoms to guide discussion of hormone therapy and alternatives, and the breast cancer risk and RMI tools support screening and referral decisions.

Reading the results: what the scores change in practice

Fertility and cycle results change planning. A clearly defined fertile window focuses timed intercourse or insemination; a PCOS risk score in the high range prompts the full Rotterdam workup and metabolic screening, since PCOS carries risks of insulin resistance and endometrial hyperplasia beyond subfertility; an AMH result interpreted in age context informs how urgently fertility treatment should be pursued and what response to stimulation might be expected. None of these results alone diagnoses anything, but each moves the woman one step along a defined pathway.

Antenatal results change surveillance and prophylaxis. A high preeclampsia risk at booking leads to aspirin prophylaxis from 12 weeks, enhanced blood pressure and growth surveillance, and delivery planning; a HELLP pattern in laboratory results triggers urgent obstetric and sometimes critical care involvement, because HELLP can deteriorate rapidly. An hCG rise slower than expected prompts closer follow-up and ultrasound rather than reassurance, keeping ectopic pregnancy in mind until an intrauterine pregnancy is seen. A teratogen flag changes prescribing to a safer alternative or prompts specialist fetal medicine input where no alternative exists.

Labour and postnatal results change counselling and care. A favourable Bishop score supports proceeding with induction with honest optimism; an unfavourable score prompts discussion of cervical ripening methods or, where induction is elective, of waiting. A high VBAC success score supports trial of labour for a woman who wants it, while a low score leads to a frank discussion of the higher chance of emergency caesarean. An EPDS above the threshold does not diagnose depression but mandates a clinical assessment, because postnatal depression is common, treatable and dangerous when missed. A menopause rating scale total gives the clinician and the woman a shared measure of symptom burden against which hormone therapy or alternatives can later be judged.

Limitations and pitfalls to respect

Risk models in women's health are population-specific. The Gail-style breast cancer models were developed and validated in women undergoing regular screening in the United States, and they estimate risk less accurately in other populations and in women with strong inherited risk such as BRCA mutations, who need genetics referral rather than a calculator. The RMI for adnexal masses is a triage tool for referral, not a diagnosis: a low RMI does not exclude malignancy and a high RMI does not confirm it, and the final assessment needs specialist ultrasound and clinical judgement.

Screening instruments measure symptoms, not diseases. The EPDS can be influenced by language, culture and the baby's age, and a score below the threshold does not rule out depression in a woman who is clearly struggling. The PCOS risk score and LH to FSH ratio support a workup but cannot diagnose polycystic ovary syndrome, which requires the Rotterdam criteria applied properly with exclusion of mimics such as thyroid disease and hyperprolactinaemia. AMH reflects ovarian reserve, the quantity of remaining follicles, but it is a poor predictor of natural fertility in an individual woman and should not be used to advise for or against attempting pregnancy.

Pregnancy calculators depend on accurate dating and honest histories. A due date from an uncertain last menstrual period can be wrong by weeks, and every downstream tool inherits that error, which is why first-trimester ultrasound dating takes precedence. hCG kinetics cannot rule out ectopic pregnancy on their own. The Bishop score is a subjective examination finding with inter-observer variation, and VBAC prediction models were derived in specific obstetric populations and fit less well where caesarean techniques and populations differ. The teratogenic drug checker summarises available evidence, but for essential medicines in pregnancy the decision needs fetal medicine input, weighing the risk of the drug against the risk of untreated maternal disease.

How to use this library

Begin from the life stage and the question. For cycle and fertility questions, track at least two to three cycles before trusting predictions, since every tool here assumes reasonably regular data. For pregnancy questions, confirm gestational age by the best available method before using any downstream calculator. Use screening tools such as the EPDS, PCOS score and endometriosis estimator as prompts for clinical assessment, not as verdicts, and bring printed or saved results to appointments: a tracked cycle history, a completed symptom scale or a dated risk score makes the consultation faster and more productive for both the woman and the clinician.

Related specialities

Frequently asked questions

Can an ovulation calculator be relied on for contraception?

No. Ovulation calculators predict the fertile window from past cycle lengths, but cycles vary, ovulation can shift, and sperm survive for days, so calendar methods alone have a substantial failure rate. They are reasonable aids for planning pregnancy, not reliable contraception; anyone wishing to avoid pregnancy should use a proven contraceptive method.

What does a slow hCG rise mean in early pregnancy?

In a viable early intrauterine pregnancy, hCG classically rises substantially every 48 to 72 hours, though slower rises can still be normal. A slower than expected rise warrants closer follow-up with repeat levels and ultrasound, and keeps ectopic pregnancy and non-viable pregnancy in the differential until an intrauterine pregnancy is confirmed. A single hCG value cannot diagnose anything on its own.

Who should be offered aspirin to prevent preeclampsia?

Women identified as high risk for preeclampsia at booking, for example those with chronic hypertension, kidney disease, diabetes, autoimmune disease or previous preeclampsia, and those with multiple moderate risk factors, are commonly advised to take low-dose aspirin daily from 12 weeks of pregnancy. The risk assessment calculator identifies these women so prophylaxis is not missed.

Does a high EPDS score mean I have postnatal depression?

Not necessarily. The Edinburgh Postnatal Depression Scale is a screening instrument, and a score above the threshold means a clinical assessment is needed, not that depression is diagnosed. Many women with raised scores turn out to need support rather than treatment, but because postnatal depression is common and treatable, a raised score should always be followed up, never ignored.

Are these calculators a substitute for antenatal or gynaecology care?

No. They organise information and quantify risk so that consultations are better informed, but pregnancy and gynaecological care require clinical examination, ultrasound, laboratory testing and professional judgement. Any concerning result, including bleeding in pregnancy, severe headache, visual changes or reduced fetal movements, needs urgent clinical assessment regardless of what a calculator says.

How often are these tools reviewed and updated?

Each calculator page is reviewed against current obstetric, gynaecological and general medical guidance and the original scoring definitions, and rechecked whenever guidance changes. The review date shown on each page reflects the most recent check by Dr. Taimoor Asghar.

Medical disclaimer: These calculators are educational tools for clinicians, students and informed readers. They are not medical advice and do not replace the judgement of a qualified health professional. If you are unwell, concerned about a result, or facing a treatment decision, seek care from your doctor, midwife or local health service promptly.

Further reading

  1. American College of Obstetricians and Gynecologists
  2. WHO: Women's Health