Pregnancy Calculator Free Due Date & Pregnancy Week Calculator Online
Wondering how many weeks pregnant you are, or when your baby is due? This free pregnancy calculator is one of the most accurate due date calculators online it works out your estimated due date, current pregnancy week and day, trimester, and conception date in seconds. Use your last menstrual period (LMP), an ultrasound dating scan, a known conception date, an IVF embryo transfer date, or a due date your doctor already confirmed. No signup, no app download just an instant, free online pregnancy due date calculator that runs right in your browser.
鱗 Calculate My Due Date NowHow Does This Due Date Calculator Work?
Most pregnancy due date calculators use Naegele’s rule the same method doctors and midwives use at your first prenatal visit. Since conception typically happens about two weeks after the first day of your last menstrual period, a full-term pregnancy is counted as 280 days, or 40 weeks, from that LMP date. This pregnancy week calculator applies the same rule automatically, and adjusts your due date if your average menstrual cycle is longer or shorter than the typical 28 days.
Don’t remember your last period, or have irregular cycles? Use the ultrasound due date calculator method instead enter your scan date and the gestational age from your ultrasound report (for example, “8 weeks 3 days”), and the tool works backward to estimate your LMP and due date. If you conceived through IVF, this also works as an IVF due date calculator: choose the transfer date method and select day 3 or day 5 transfer for a precise estimate.
What Does the Pregnancy Calculator Show You?
- Estimated due date: a full calendar date, not just a week number.
- Current week and day of pregnancy, updated to today’s date so you always know exactly how far along you are.
- Trimester calculator result: first, second, or third trimester.
- Conception date calculator estimate, useful for records or curiosity.
- Days remaining until your due date.
- A full pregnancy milestones calendar first prenatal visit, end of first trimester, anatomy scan window, viability, and full term each mapped to a real calendar date.
How Accurate Is an Estimated Due Date?
Only a small share of babies are born on their exact estimated due date. The World Health Organization considers a pregnancy full term anywhere between 37 and 42 weeks, so treat your due date estimate as a helpful planning target rather than a guarantee. Your doctor may refine this pregnancy due date further after an early ultrasound, which is generally the most accurate dating method in the first trimester.
Frequently Asked Questions About the Pregnancy Calculator
280 days (40 weeks) are added to the first day of your last menstrual period. If your cycle is longer or shorter than 28 days, the estimated due date shifts a little later or earlier to reflect when you likely ovulated.
Yes. Choose the “Ultrasound” method and enter your scan date along with the gestational age from your ultrasound report, or use a known conception date or IVF transfer date instead.
Yes. Select “IVF Transfer Date”, choose day 3 or day 5 transfer, and enter your transfer date for a due date estimate built around your specific IVF timeline.
Once you enter your dates, the calculator instantly shows your current week and day of pregnancy along with your trimester, so you always know exactly where you stand.
Completely free, with no signup and no limit on how many times you use it. All calculations run instantly in your browser.
This tool provides a general estimate for planning purposes only and is not a substitute for medical advice. Always confirm your due date and pregnancy milestones with your doctor or midwife.
鱗 Open the Pregnancy Due Date Calculator