Pregnancy Due Date Calculator
Estimate your due date based on the first day of your last menstrual period (LMP).
⚕️ Naegele’s rule: Due date = LMP + 280 days (40 weeks). This is an estimate; consult your healthcare provider.
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Trimester
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Weeks Remaining
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Days Passed
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Conception window (approx)
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How to use
- Enter the first day of your last menstrual period (LMP).
- The calculator adds 280 days (40 weeks) to estimate the due date.
- Results show your current week of pregnancy, trimester, days remaining, and approximate conception window.
- This is an estimate – always consult your doctor for medical advice.
- Click Copy Due Date to copy the estimated due date.
🔒 100% client‑side – your data never leaves your browser.