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References and Literature can be found here about:

Recent Reviews

Intrauterine growth restriction: new concepts in antenatal surveillance, diagnosis, and management AJOG 2010
Customised assessment of fetal growth potential: implications for perinatal care ADC-FNN, 2012

Gestation Calculator


  • Robinson HP, Fleming JEE. A critical evaluation of sonar 'crown-rump length' measurements. Br J Obstet Gynaecol 1975, 82:702-10
  • Mul T, Mongelli M, Gardosi J A comparative analysis of second trimester ultrasound dating formulae in pregnancies conceived with artificial reproductive techniques. Ultrasound Obstet Gynecol, 1996;8:397-402
  • Altman DG, Chitty LS. New charts for ultrasound dating of pregnancy. Ultrasound Obstet Gynecol 1997;10:174-91

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Growth Charts

For detailed information including background, concepts, coefficients and references, click here
For an overview article on 'New Definition of SGA', click here
RCOG Green Top Guideline Number 31: The Investigation and Management of the Small-for-gestational-age fetus. (updated March 2013) Click here

Previous (2002) version is archived here

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Estimating Fetal Weight

The calculator is based on Campbell's (A) formula [1] and Hadlock's (H, A and F) formula [2],
where: A = Abdominal circumference; F = Femur length; H = Head circumference


  • Campbell S, Wilkin D. Ultrasonic measurement of fetal abdomen circumference in the estimation of fetal weight. Br J Obstet Gynecol 1975; 82:689-697
  • Hadlock FP, Harris RB, Sharman RS, Deter RL, Park SK. Estimation of fetal weight with the use of head, body and femur measurements - a prospective study. Am J Obstet Gynecol 1985; 151:333-337.

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Centile Calculator

For detailed information including background, concepts, coefficients and references, click here


  • Gardosi J, Chang A, Kalyan B, Sahota D, Symonds EM. Customised antenatal growth charts.
    Lancet 1992;339:283-7
  • Gardosi J, Mongelli M, Wilcox M, Chang A. An adjustable fetal weight standard.
    Ultrasound Obstet Gynecol 1995;6: 168 - 74

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