Estimate a due date and pregnancy timeline from the dating method selected in the form.
Pregnancy Due Date Calculator
Form
Results
Estimated Due Date is
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Table of Contents
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What is Pregnancy Due Date?
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How to Use This Calculator
- Enter or select Method, The first day of your last period, Cycle Length, I conceived on.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
LMP estimate = first day of last period+280 days, with the page’s cycle adjustment; conception estimate = conception+266 days.
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Variables Explained
| Input | What it means |
|---|---|
| Method | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| The first day of your last period | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Cycle Length | The measured end-to-end distance of the section being calculated. |
| I conceived on | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
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Worked Example
A conception-date estimate adds 38 weeks, while a standard last-period estimate adds 40 weeks.
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Why Use This Calculator?
Use the calculation to make the method and its inputs easier to check with a healthcare professional. Its meaning depends on the clinical setting and on whether the underlying method is appropriate for that person.
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Common Mistakes
- Clinical dating can be revised using ultrasound and assisted-reproduction details; an estimated due date is not a guaranteed delivery date.
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Frequently Asked Questions
Is this result a diagnosis or treatment instruction?
No. It describes a calculation or score from the supplied information. A qualified clinician must check the measurements, the method’s applicability and the wider clinical picture.
Can I enter the units from any lab report?
Use the units specified in the form and select a conversion only where the page provides one. Different substances need different conversion factors; a mismatch can produce a plausible but incorrect result.
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Sources & References
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