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Pregnancy Due Date Calculator

Calculate exactly what you need with our free Pregnancy Due Date Calculator. Calculate estimated due date based on last period. Join thousands of users...

Decision summary

Pregnancy Due Date Calculator estimates Estimated Due Day of Year from First Day of Last Period (Day of Year). Use it as a directional estimate, then verify current quotes, rates, rules, or professional advice before acting.

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Change these first: First Day of Last Period (Day of Year).
Watch these outputs: Estimated Due Day of Year.
Sanity check: compare at least two scenarios before using the estimate for a quote, purchase, or planning decision.
Pregnancy Due Date Calculator
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Configure parametersUpdated: Feb 2026
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0 - 200

Estimated Due Day of Year

0
Assumptions used
These are the live inputs behind the result. Change one at a time before acting on the estimate.

First Day of Last Period (Day of Year)

100

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Expert Analysis & Methodology

Pregnancy Due Date Calculator

Calculate estimated due date based on last period.

How to Use

Enter your values in the fields below and the calculator will automatically compute the results.

FAQ

Is this calculator accurate? This calculator provides estimates based on industry-standard formulas. For precise figures, consult a professional.

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Disclaimer

This calculator is provided for educational and informational purposes only. It does not constitute professional legal, financial, medical, or engineering advice. While we strive for accuracy, results are estimates based on the inputs provided and should not be relied upon for making significant decisions. Please consult a qualified professional (lawyer, accountant, doctor, etc.) to verify your specific situation. CalculateThis.ai disclaims any liability for damages resulting from the use of this tool.