Due date calculator
Estimate a due date from your last period or an IVF embryo transfer.
- , -Your receipt will appear hereFix the value in red to update the result.
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How does it work?
Step 1Choose last menstrual period or IVF.
Step 2Enter the date and cycle length or embryo age.
Step 3Review the estimate with your maternity care team.
LMP + 280 + (cycle − 28) days · IVF: transfer + 266 − embryo age
Frequently asked questions
Last menstrual period + 280 days, adjusted relative to a 28-day cycle. Irregular cycles make this less reliable.
Add 266 days minus the embryo age to the transfer date: 261 days for a 5-day embryo.
No. Ultrasound and your care team determine clinical dating. This estimate does not replace pregnancy care.