Crown-Rump Length Calculator

Free calculate gestational age from crown-rump length (CRL). This is an educational tool only - always consult a healthcare provider.

Ultrasound Measurement

Typically measured between 6-13 weeks

Results

Enter CRL measurement to calculate gestational age

About CRL

  • • Most accurate dating method in first trimester
  • • Formula: GA (days) = 5.2876 × CRL^0.4 + 23.687
  • • Used between 6-13 weeks gestation
  • • ±5-7 days accuracy