Due Date Calculator

Yes. Early ultrasound, cycle updates, or a clearer conception date can shift the estimate.

Either can be used. The last period method is common, while conception or IVF can give a more specific reference.

You can use ovulation timing to narrow the estimate when you know the cycle more precisely.

Use it when you want to check the best timing for testing rather than the full pregnancy timeline.

The calculator starts from the first day of your last period and adds a typical pregnancy length, then adjusts for cycle length if needed.

The estimate shifts a little so it matches the cycle length you entered instead of assuming a 28-day cycle for everyone.

Yes. If you know the likely conception date, that method usually gives a more direct estimate than starting from your last period.

Yes. The estimate can change if cycle information is updated or if clinical dating provides a more precise reference.

Often yes, especially early in pregnancy, because ultrasound can date the pregnancy more directly than a calendar estimate.

Full term is commonly described as the range from 39 weeks to 40 weeks and 6 days.

You can use it as a rough guide, but irregular cycles make calendar estimates less reliable.

Yes. IVF usually uses the transfer date and embryo age, which gives a more specific starting point for the estimate.