OhMyCalc

Conception Calculator

Estimate the date of conception from your last period date or expected due date. Find your fertile window.

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How to Use the Conception Calculator

  1. Enter your personal measurements (weight, height, age, etc.).
  2. Select any relevant options such as gender or activity level.
  3. Click Calculate or view the instant result.
  4. Review your result and the interpretation or category it falls into.

Référence rapide

DeVers
1st trimesterWeeks 1–12
2nd trimesterWeeks 13–26
3rd trimesterWeeks 27–40
Due date40 weeks (280 days)
Full term37–42 weeks
Preterm< 37 weeks

Cas d'utilisation

Formule

Conception ≈ last period + 14 days, or due date − 266 days. Fertile window: conception ± 3 days.

Questions fréquemment posées

How to use?
Enter the data and click the calculate button.
Calculation accuracy?
Calculations are performed with high precision.
Is it free?
Yes, all calculators are completely free.