👶 Pregnancy Due Date Calculator
Estimated due date and current gestational age from your last menstrual period (LMP), using the standard Naegele's rule.
This is a general estimate based on the standard Naegele's rule formula (LMP + 280 days), not medical advice or a diagnosis. Actual due dates vary — only around 5% of babies arrive on the estimated date, and cycle length or ultrasound dating can shift the estimate. Please confirm timing with a healthcare provider.
1. Last menstrual period
Naegele's rule assumes a 28-day cycle. If yours is longer or shorter, the estimate is adjusted by the difference from 28.
Estimated result
Estimated due date
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Gestational age today
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| LMP | — |
|---|---|
| Naegele's rule | LMP + 280 days (40 weeks), adjusted for cycle length |
| Today's date | — |
| Trimester | — |