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Due Date Calculator

Estimate a pregnancy due date from the first day of the last menstrual period.

My tools →
days

Estimated due date

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Pregnancy dating estimate only. Confirm dating with a qualified prenatal care professional.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Due Date Calculator

  1. 1 Enter the requested details.
  2. 2 Review the estimate and the limitations shown with it.

How the estimate works

The estimate counts 280 days from the first day of the last menstrual period, adjusted for the entered cycle length relative to 28 days. This assumes a regular cycle and is not a confirmation of pregnancy or a medical due date. A clinician may revise dating using ultrasound. Source: American College of Obstetricians and Gynecologists.

How to use this calculator

Enter the requested values and review the result alongside the limits of the estimate.

Important limitations

This result is for general information. Individual circumstances can change what is appropriate; consult a qualified professional when making health decisions.

Frequently asked questions

How does this calculator work?

The estimate counts 280 days from the first day of the last menstrual period, adjusted for the entered cycle length relative to 28 days. This assumes a regular cycle and is not a confirmation of pregnancy or a medical due date. A clinician may revise dating using ultrasound. Source: [American College of Obstetricians and Gynecologists](https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2017/05/methods-for-estimating-the-due-date).

Is this a diagnosis or personalized advice?

No. This is an informational estimate and does not replace professional advice.

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