Pregnancy Due Date Calculator
Estimate a pregnancy due date from a start date or conception date.
Estimate a pregnancy due date from a start date or conception date.
Due date estimate
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Tool guide
Free Online Pregnancy Due Date Calculator
Estimate a pregnancy due date from a last menstrual period, conception date, or IVF transfer date. The browser-based calculator uses a fixed offset for the selected method and shows an estimated pregnancy week for informational use.
Steps
How it works
- Choose Last menstrual period, Conception date, or IVF transfer date.
- Enter the corresponding date.
- Calculate the estimated due date and pregnancy week.
- Use the result as general information and discuss clinical dating with a healthcare professional.
Highlights
Key features
- Supports LMP, conception-date, and IVF-transfer methods.
- Uses 280 days from LMP, 266 days from conception, or 263 days from IVF transfer.
- Displays the estimated due date in a readable format.
- Shows an estimated current pregnancy week.
- Processes the entered date in the browser.
Use cases
Common uses
- Estimate a due date from the first day of the last menstrual period.
- Estimate from a known or assumed conception date.
- Create a general IVF transfer-date estimate.
- Prepare questions for a prenatal appointment.
Notes
Limitations to know
- A due date is an estimate and not a guaranteed delivery date.
- The LMP method uses a fixed 280-day assumption and does not adjust for cycle length.
- The IVF option uses one fixed 263-day offset and does not distinguish embryo age or transfer protocol.
- Ultrasound dating and clinical corrections are not supported.
- The pregnancy-week result uses the current browser time and fixed method assumptions.
- This tool is informational and is not medical advice or a substitute for professional care.
FAQ
Frequently asked questions
Is the calculated due date guaranteed?
No. Pregnancy length varies, and the displayed date is only an estimate based on the selected method.
Can I calculate from my last menstrual period?
Yes. Select Last menstrual period and enter its first date; the tool adds 280 days.
Can I calculate from conception?
Yes. The conception method adds 266 days to the entered date, although conception dates can themselves be estimates.
Does cycle length change the result?
No. Custom cycle-length adjustment is not implemented.
Does the tool replace a clinician's estimate?
No. Use it for general information and consult a healthcare professional for clinical dating and care.