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Pregnancy Due Date Calculator
Estimate a due date from LMP, conception, or ultrasound gestational age.
Estimates only. A clinician establishes the obstetric due date. LMP assumes a 28-day cycle; conception adds 266 days, not 280. Dates remain in this tab and are not saved.
Enter a valid calendar date
How to use Pregnancy Due Date Calculator
Enter your inputs above, choose the available mode, and review the results. Copy or download options appear where supported. These tools process your inputs in your browser.
Estimates only. A clinician establishes the obstetric due date. LMP assumes a 28-day cycle; conception adds 266 days, not 280. Dates remain in this tab and are not saved.
Health results are general estimates and cannot establish a diagnosis or an individual treatment plan. Review important decisions with a qualified clinician.
Dating reference: ACOG: Methods for Estimating the Due Date.
Frequently asked questions
Are my inputs uploaded?+
No. These tools process entered text, numbers and selected files locally in your browser. Invoice templates are saved on your device only when you explicitly choose to save them.
Can I use this tool for free?+
Yes. No account is required. Estimates depend on your inputs and the assumptions explained on this page.