Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week
How to Use Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week No signup, and nothing gets uploaded for most use.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why you might like it
- Nothing to upload — the work happens on your device.
- Free with no signup, no watermarks, and no daily limits.
- Works in any modern browser on any device — nothing to install.
- Usually done in a few seconds, so it doesn't get in your way.
Frequently Asked Questions
Why is the due date based on the last menstrual period?▾
Pregnancy is dated from the first day of the last menstrual period (LMP), which is approximately 40 weeks (280 days) before the expected delivery. This is the standard clinical method.
Can my due date change?▾
Yes. An ultrasound scan in the first trimester is the most accurate way to date a pregnancy and may revise the LMP-based estimate if they differ by more than a few days.
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