Conception Date Calculator

Estimate the conception date from your last period. Free conception date calculator.

cycle

Result

220

Breakdown

Weeks Pregnant
8.6
Trimester
1

Frequently Asked Questions

How is a due date calculated?▼
Most calculators use Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. Only about 5% of babies arrive on the exact date.
How accurate are due dates?▼
Due dates are estimates with a normal full-term window of 37-42 weeks. Ultrasound in the first trimester can refine the estimate.

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