Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week. No signup, no uploads, no watermarks.
- 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 choose Pregnancy Due Date Calculator?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
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.
Related Tools
BMI Calculator
Calculate your Body Mass Index and healthy weight range
One Rep Max Calculator
Estimate your one-rep max from any set
BMR Calculator
Estimate basal metabolic rate and daily calorie needs
Body Fat Calculator
Estimate body fat percentage with the US Navy method
Body Surface Area Calculator
Calculate body surface area with multiple medical formulas
Daily Calorie Needs Calculator
Find maintenance calories and targets for weight goals
Calories Burned Calculator
Estimate calories burned across dozens of activities
Heart Rate Zones Calculator
Find your target heart rate zones for training