Use this calculator to estimate pregnancy due dates, ovulation dates, fertile windows, and related timeline information based on the dates you enter.
This tool can be helpful for general planning and education, but pregnancy and fertility timing can vary from person to person. A healthcare professional should confirm pregnancy dating and medical decisions.
Most cycles are 21–35 days. Default is 28.
Count from the first day of one period to the first day of the next.
Results are estimates based on the dates and average cycle length you provide. Actual ovulation, conception, and delivery dates vary from person to person and cycle to cycle. This tool is not a substitute for medical advice — for confirmation of pregnancy, fertility planning, or due-date dating, consult a qualified healthcare professional.
How to Use This Tool
- Choose the calculation method.
- Enter the first day of your last menstrual period, conception date, ultrasound information, or IVF transfer date if available.
- Enter your average cycle length if using ovulation or period-based estimates.
- Click calculate.
- Review the estimated due date, fertile window, ovulation day, or pregnancy timeline.
What This Tool Does
Depending on the inputs, this calculator may estimate:
- Pregnancy due date
- Estimated conception date
- Estimated ovulation day
- Fertile window
- Trimester timeline
- Days remaining until estimated due date
- Expected next period
Common Uses
You can use this calculator to:
- Estimate a due date
- Understand a general pregnancy timeline
- Estimate ovulation timing
- Estimate fertile window dates
- Compare different dating methods
- Prepare questions for a healthcare provider
Limitations
Ovulation and conception timing can vary. Cycle length may change from month to month. Ultrasound dating, IVF transfer dates, and medical history may affect due date estimates.
This calculator cannot confirm pregnancy, diagnose fertility issues, or replace medical care.
Frequently Asked Questions (FAQs)
Is the due date exact?
No. A due date is an estimate. Many babies are born before or after the estimated due date.
Can this calculator confirm pregnancy?
No. It cannot confirm pregnancy. Use a pregnancy test and consult a healthcare professional.
Is ovulation always on the same cycle day?
No. Ovulation can vary depending on cycle length, stress, health, hormones, and other factors.
Should I use this for IVF?
This tool may provide an estimate if IVF transfer information is entered, but IVF dating should be confirmed by a fertility specialist or healthcare provider.
Disclaimer
Results are estimates based on the dates and average cycle length you provide. Actual ovulation, conception, and delivery dates vary from person to person and cycle to cycle. This tool is not a substitute for medical advice. For confirmation of pregnancy, fertility planning, or due-date dating, consult a qualified healthcare professional.