Due Date Calculator
Estimate your pregnancy due date and current gestational age from your last menstrual period.
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Estimated due date
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How far along
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Trimester
How to use
- Enter the first day of your last menstrual period (LMP).
- Adjust your average cycle length if it differs from 28 days.
- See your estimated due date, how far along you are, and the trimester.
Frequently asked questions
How is the due date calculated?
It uses Naegele's rule: 280 days (40 weeks) from the first day of your last menstrual period, adjusted for cycle length. Only about 4% of babies arrive on the exact date.
Is this a substitute for medical advice?
No. This is an estimate for general information only. Always confirm dates with your healthcare provider, who may adjust them based on an ultrasound.
🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.
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