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Due Date Calculator
Estimate due date from last menstrual period
due datepregnancygestational age
📖 How to Use
- Enter the first day of your last menstrual period
- Click Calculate Due Date
📐 Formula
Naegele's rule: due date = last period + 280 days (40 weeks)
❓ FAQ
How accurate is the due date?▾
It's an estimate — only about 5% of babies arrive on their exact due date.
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About Due Date Calculator
This tool is completely free, no registration required. Works directly in your browser. Supports both PC and mobile devices.
Due Date Calculator is a free online tool that works on both PC and mobile. No registration or download required — just open in your browser. Results are accurate and reliable for everyday use and professional reference.