Estimate your baby's due date.
Enter the first day of your last period and we'll estimate your due date in seconds, plus how many weeks pregnant you are today.
Your estimate will appear here.
An estimate only — your midwife will confirm your due date at your dating scan.
How is your due date calculated?
Your estimated due date is based on the first day of your last menstrual period (LMP). A full-term pregnancy typically lasts about 280 days (40 weeks) from this date.
- Start from the first day of your last period
- Add 280 days, or 40 weeks
- That's your estimated due date
This method is commonly used by healthcare professionals, although your exact due date may vary depending on individual factors and the timing of ovulation.
This calculator gives an estimate only and may not reflect the exact date your baby arrives. Baby Bloom can't give medical advice — if you have any questions about your pregnancy or your due date, talk to your midwife or GP.