Pregnancy Due Date Calculator - LMP, Conception, or Ultrasound

Estimate your due date from LMP, conception date, or ultrasound scan (Naegele's rule)

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Note : L'interface de l'outil ci-dessous n'est actuellement disponible qu'en anglais. On traduit les UI une par une. Voir cet outil en anglais →
Estimated due date
Sat Jun 12 2027
Current gestation: 0 weeks 0 days
Based on Naegele's rule (280 days from LMP). This is an estimate - only ~5% of babies are born on their exact due date. This tool is not medical advice; consult your healthcare provider for a clinical estimate.
Estimations uniquement. Les résultats sont générés par des formules générales à partir des données que tu saisis, uniquement à titre informatif. Ce ne sont pas des conseils financiers, fiscaux, juridiques, médicaux ou professionnels, et ils ne tiennent pas compte de ta situation individuelle, juridiction, taxes, frais ou état de santé. Vérifie toujours les chiffres importants avec un professionnel qualifié. En utilisant cet outil, tu acceptes nos Conditions & Avertissement.

Comment ça marche

  1. 1
    Pick a method

    LMP (last menstrual period), conception date, or ultrasound scan.

  2. 2
    Enter the date

    For LMP, add your average cycle length if not 28 days. For ultrasound, add the reported weeks + days.

  3. 3
    Read your due date

    See the estimated due date and your current gestational age in weeks + days.

À propos de Pregnancy Due Date Calculator - LMP, Conception, or Ultrasound

Free pregnancy due date calculator using Naegele's rule (280 days from LMP). Choose from three input methods - last menstrual period (with cycle length adjustment), known conception date, or an ultrasound scan with the reported gestational age. Also shows your current gestation in weeks and days. Runs entirely in your browser. Pregnancy Due Date Calculator - LMP, Conception, or Ultrasound sur 712 Tools tourne entièrement dans ton browser via des APIs JavaScript natives - aucun server ne voit jamais tes données. Résultats instantanés, privacy complète, et aucune limite d'upload.

Que ce soit pour une session de debug, un sanity check rapide ou un incident en prod, cet outil est gratuit à utiliser autant que tu veux. Pas de watermarks, pas de signup et pas d'ads dans l'outil.

Questions fréquentes

How accurate is a due date estimate?

Only about 5% of babies are born on their exact due date. Most arrive within two weeks either side.

Which method is most accurate?

An early ultrasound (before 13 weeks) is usually the most accurate. LMP is close if your cycles are regular.

Is this medical advice?

No - this is informational only. Consult your healthcare provider for a clinical estimate and prenatal care.

Is my data uploaded?

No. All calculations run entirely in your browser.

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