Pregnancy Due Date Calculator
Estimate due date from last period with trimester milestones. Get the 40-week roadmap instantly — free, local, informational only.
How to Use the Pregnancy Due Date Calculator
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Frequently Asked Questions
How is the due date computed?
LMP plus 280 days, adjusted by (cycle length − 28): LMP January 1, 2026 with a 28-day cycle gives October 8, 2026. Only ~5% arrive exactly on it — two weeks either side is normal.
Irregular cycles?
Early ultrasound dating beats LMP math when cycles vary. Bring both dates to the first appointment.
Trimester breakdown?
Weeks 1–13, 14–27, 28–birth with milestone markers. The tool maps current week to what to expect next.
Do due dates upload?
No — math runs locally in your browser. Health data never leaves your device.
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Last updated October 2026