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Results: 7
Conception Calculator
Estimate a possible fertile window from cycle history and explore menstrual, conception, ultrasound or IVF pregnancy-dating methods.
Due Date Calculator
Estimate a due date from the last period, conception date, IVF transfer or ultrasound dating, using the selected method's inputs.
Ovulation Calculator
Estimate ovulation timing and a possible fertile window from cycle length and luteal-phase assumptions, without confirming ovulation.
Period Calculator
Project a next-period date from menstrual history and assumed cycle length, with associated cycle estimates and their limitations.
Pregnancy Calculator
Estimate pregnancy dates from menstrual history, conception, ultrasound, IVF transfer or a known due date, with dating assumptions explained.
Pregnancy Conception Calculator
Estimate conception timing from a known due date or other pregnancy-dating information, while keeping the uncertainty of dates explicit.
Pregnancy Weight Gain Calculator
Compare pregnancy weight gain with BMI-specific singleton or twin reference guidance, without prescribing an exact week-by-week target.
Understanding pregnancy and cycle timelines
Pregnancy dating can start from menstrual information, an IVF transfer, ultrasound dating, or an already known due date. Cycle tools instead extend a reported cycle pattern to estimate future dates. Choose the method that matches the information available rather than treating those starting points as interchangeable.
Calendar estimates do not confirm ovulation, conception, or an exact birth date. Cycle predictions are not a reliable method of contraception. Review the selected method's uncertainty and seek individualized maternity care for clinical dating or health concerns.
Compare the questions
| Choose a method | Inputs | Method |
|---|---|---|
| Pregnancy Calculator Last menstrual period |
| Estimated due date = LMP + 280 days + (cycle length−28). How it works |
| Due Date Calculator Last menstrual period |
| Estimated due date = LMP + 280 days + (cycle length−28). How it works |