Pregnancy & Fertility Calculators
Plan and track pregnancy from trying to conceive through the third trimester. Every tool is unit-tested and explained with cited sources.
Due Date Calculator Your estimated due date from your last period, conception, or IVF transfer, with gestational age. Pregnancy Calculator How far along you are, week by week — with a dated timeline of every milestone. Ovulation Calculator Your fertile window and ovulation day from your last period and cycle length. Period Calculator Forecast your next several periods, plus each cycle’s ovulation and fertile window. Conception Calculator Work back from a due date or last period to your likely conception date and window. Pregnancy Weight Gain Calculator Your recommended pregnancy weight gain by pre-pregnancy BMI, on the IOM 2009 guidelines.
Which calculator do you need?
- Trying to conceive — the Ovulation Calculator finds your fertile window; the Period Calculator forecasts your cycle.
- Newly pregnant — the Due Date Calculator estimates your due date and gestational age; the Conception Calculator works backward to when you conceived.
- During pregnancy — the Pregnancy Weight Gain Calculator shows your recommended gain on the IOM guidelines.
These tools give general information and estimates, not medical advice. A first-trimester dating ultrasound is the most accurate way to date a pregnancy — always follow your midwife or doctor's guidance.