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Women's Health Calculators
Predict your next periods and fertile days, and estimate a pregnancy due date, week and trimester from published guidance.
Nothing you enter leaves your device.
Results are estimates for general information only, not medical advice.
All women's health tools
- Women's Health
Period Calculator
Predict your next periods and today's cycle day from your last period.
- Women's Health
Ovulation Calculator
Estimate ovulation and your fertile window for the next three cycles.
- Women's Health
Pregnancy Due Date Calculator
Estimate your due date, pregnancy week and trimester.
- Women's Health
Conception Date Calculator
Estimate when a pregnancy began from the due date or the last period.
- Women's Health
Pregnancy Weight Gain Calculator
See the recommended weight gain for your pregnancy from your weight before it.
Good to know
Frequently asked questions
Can I use these calculators to avoid pregnancy?
No. Cycle, ovulation and fertile-day estimates are not a method of contraception.
Which due date counts, this one or the scan?
An early ultrasound date is more accurate and takes priority. Your midwife or doctor will use that one.
Are these calculators medical advice?
No. They give estimates for general information, using the published formulas named on each page. For decisions about your health, talk to a doctor or another qualified professional.
Is anything I enter stored or sent?
No. Every calculator runs in your browser. Nothing you type is saved, sent to a server or used for advertising.
Can I use these calculators on a phone?
Yes. Every calculator works in a phone browser, with metric or imperial units where it applies, and with the number format of your language.