Enter LMP date to estimate due date.
This is an estimate and actual due dates may vary. Consult a healthcare professional for medical advice.
Estimate expected due date from LMP and see current pregnancy week using a standard 40-week method.
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Estimates for planning—not medical advice.
Enter LMP date to estimate due date.
This is an estimate and actual due dates may vary. Consult a healthcare professional for medical advice.
Estimate expected due date from LMP and see current pregnancy week using a standard 40-week method.
Estimate pregnancy due date from the first day of your last menstrual period (LMP) with a simple 40-week calculation.
Provide the values required by the tool.
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The common Naegele-style estimate adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). Ultrasound dating may adjust this in clinical care.
Only about 4–5% of babies are born on the exact estimated date. LMP dating assumes a regular 28-day cycle; irregular cycles or late ovulation can shift the true due date.
LMP dates stay on your device for due-date calculations.
Estimates for planning—not medical advice.
Educational estimates only—not a substitute for clinical care. Health information is for educational purposes only and is not medical advice. Consult a qualified healthcare provider before making health decisions.
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Reviewed by EverydayTools Editorial Team on 2026-05-19.