Pregnancy Due Date Calculator
Estimate your baby due date from the first day of your last menstrual period using Naegele rule, the standard method that adds 280 days (40 weeks) to that date. Enter your last period date and, if you know it, your typical cycle length so the estimate can be adjusted, and the calculator returns your estimated due date along with how many weeks and days pregnant you are today and which trimester that falls in. Remember that only about one in twenty babies actually arrives on the estimated date, and this figure is an estimate, not a diagnosis. An ultrasound dating scan from your care provider is more precise. All of the calculation happens locally in your browser and no health information is stored or sent.
How to use Pregnancy Due Date Calculator
- Enter the first day of your last menstrual period.
- Read your estimated due date.
- Check your current pregnancy week and trimester.
Frequently asked questions
How is the due date estimated?
It uses Naegele rule, adding 280 days, about 40 weeks, to the first day of your last menstrual period.
What is LMP?
LMP is the first day of your last menstrual period, the standard starting point for dating a pregnancy.
Can it show my current week and trimester?
Yes. From today and your LMP it calculates your current gestational week and which trimester you are in.
What is Pregnancy Due Date Calculator?
Estimate your baby due date from the first day of your last menstrual period using Naegele rule, the standard method that adds 280 days (40 weeks) to that date. Enter your last period date and, if you know it, your typical cycle length so the estimate can be adjusted, and the calculator returns your estimated due date along with how many weeks and days pregnant you are today and which trimester that falls in.
Is Pregnancy Due Date Calculator free to use?
Yes. Pregnancy Due Date Calculator is completely free, with no sign-up and no usage limits.
Does Pregnancy Due Date Calculator work in a web browser?
Yes. Pregnancy Due Date Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Pregnancy Due Date Calculator?
Yes. Pregnancy Due Date Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/pregnancy-due-date-calculator)