Free Pregnancy Due Date Calculator
Estimate a pregnancy due date and current gestational age from your last period, conception date, or IVF transfer date, instantly in your browser.
Enter a date to estimate a due date.
This gives a standard estimate (Naegele's rule and its conception/IVF-adjusted variants), not a medical diagnosis. Only about 1 in 20 births happen exactly on the estimated due date — always confirm with your doctor or midwife, especially if your cycle is irregular.
How to use this due date calculator
- Choose how you want to calculate: last period, conception date, or IVF transfer date.
- Enter the relevant date.
- Read your estimated due date, current gestational age, and trimester.
Medical disclaimer
This tool provides a standard mathematical estimate (Naegele's rule and its conception/IVF-adjusted variants), not a medical diagnosis. Only about 1 in 20 babies are born exactly on their estimated due date, and estimates are less reliable with irregular cycles. Always confirm timing with your doctor or midwife, especially once ultrasound dating is available.
Common use cases
- Estimate a due date from the first day of your last menstrual period
- Estimate a due date from a known conception date
- Estimate a due date from an IVF embryo transfer date
Frequently asked questions
Is this due date calculator free?
Yes. It is completely free, with no signup and no limits.
How accurate is the estimated due date?
It's a standard statistical estimate, not a guarantee — only around 5% of babies arrive exactly on their estimated due date. An early ultrasound is generally considered more accurate than date-based estimates alone.
What if my cycle isn't 28 days?
For the last-period method, enter your average cycle length and the estimate adjusts accordingly. If your cycles are very irregular, a conception-date or ultrasound-based estimate from your doctor will be more reliable.
Is my information stored anywhere?
No. This calculation happens entirely in your browser and nothing is sent to Inqita or stored.