5 calculatorsDue date, ovulation, cycles
Pregnancy & Fertility
Pregnancy and fertility calculators turn a date, such as the first day of your last period, into an estimate: your due date, how many weeks pregnant you are, a likely conception date, your fertile window and ovulation day, or when your next period may start. Each one explains its method and assumptions, such as cycle length. Cycles vary, so your doctor or midwife will confirm dates with an exam or ultrasound.
- Ovulation Calculator Free ovulation calculator: enter the first day of your last period and cycle length to estimate ovulation, your fertile window and the next six cycles.
- Pregnancy Week Calculator Pregnancy week calculator: find how many weeks and days pregnant you are, your trimester and due date from your last period, conception or IVF transfer.
- Pregnancy Due Date Calculator Pregnancy due date calculator: estimate your due date from your last period, conception, IVF transfer or an ultrasound, plus weeks pregnant and trimesters.
- Conception Calculator Conception calculator: work back from a due date, a last period or a birth date to the likely date of conception and the fertile window around it.
- Period Calculator Period calculator: predict when your next period starts and ends, see your cycle day, days late and next six periods, with a range for irregular cycles.