Estimate the date of conception based on a known due date
Assumes a 28-day cycle with ovulation on day 14. Actual conception can fall several days either side (sperm survive up to 5 days), and only a minority of babies arrive on the due date. Ultrasound dating is more accurate. Educational estimate, not medical advice.
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Conception Calculator is built on published formulas and reference ranges from established health sources. We revisit it periodically as guidance evolves; the "Last reviewed" date above shows when that last happened. If something looks wrong, tell us with the feedback button in the bottom-right corner.