All tools
Due date calculator
A baby's due date from the last period and cycle length, conception, an IVF transfer or a scan, as ACOG counts it. Free, with no account or uploads.
When your baby is due
Type the first day of your last period and your usual cycle length, or count from conception, IVF or a scan.
Counting from
Last periodConceptionIVF transferA scan
From the first day of one period to the first day of the next.
Type a date to see the answer.
This is arithmetic on your numbers, not medical advice; ask a doctor, nurse or midwife about your own health. Worked out in your browser; nothing you type is sent anywhere or kept, and this page has no adverts.
A little help along the way
Follow these steps. Every option is explained underneath. Everything runs in your browser; nothing is sent anywhere or kept.
- Say what you want to work outA due date, how far along you are, the conception date, or your fertile days.
- Say what you are counting fromYour last period, a due date you were given, conception, an IVF transfer or a scan.
- Type the dateWith your usual cycle length for a period, the embryo's age for IVF, or the age a scan gave.
- Read the answerIn words, with the rule it was counted by; add a due date to your calendar.
Questions people ask
- How is the due date worked out?
- 280 days from the first day of your last period (Naegele's rule, as ACOG counts it), moved by your cycle's length less 28 days.
- What if an early scan gives another date?
- Under More options, type the scan's date and the age it gave; the page says whether the gap is larger than ACOG's margin for that week, when the scan's date is used.
- Is anything I type kept?
- No. Nothing is sent anywhere or kept, and the page has no adverts.
This page is the Pregnancy calculator, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Pregnancy calculator's own page.
Read the step-by-step guide