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Pregnancy Due Date Calculator
Calculate expected due date from last menstrual period.
days
Estimated Due Date
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Remaining
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Current Progress
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Trimester
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Est. Conception
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About This Calculator
The CalcWise Pregnancy Due Date Calculator gives you instant, accurate results right in your browser. All calculations happen locally — we never store or transmit your data. Whether you're on desktop or mobile, this free tool is always available with no signup required.
Frequently Asked Questions
Add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is Naegele's rule.
Only about 5% of babies are born on their due date. Most arrive within 2 weeks before or after.
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