Pregnancy & Baby Calculators

Estimate your baby’s due date from your last period, conception date or IVF transfer — with your current gestational age and how far along you are.

Estimate when conception likely happened — from your due date or your last period — with the fertile-window range around ovulation.

Find your estimated ovulation day, most fertile window and next period from the first day of your last period and your cycle length.

See your fertile window, ovulation day and peak days from your last period, cycle length and luteal phase.

Find out how many weeks and days pregnant you are from your last period — with your trimester, days remaining and progress to 40 weeks.

See which trimester you’re in and the exact date ranges of all three trimesters, based on your last period.

Work out your hCG doubling time and percent rise from two blood-test values and the hours between them.

See the IOM recommended pregnancy weight gain for your pre-pregnancy BMI, and roughly how much gain to expect by your current week.

Predict your next three period start dates and your next ovulation from your last period and cycle length.

Work out a premature baby’s corrected (adjusted) age from the birth date and original due date, alongside chronological age.

Plan your maternity leave dates — start, last day off and return to work — from your due date and leave length.