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GROW Centile Calculator
UK v2.1.6.1

Information ethnicity
'Ethnic Origin' describes where the family originates from, as distinct from place of birth. The categories listed below have coefficients based on supplied databases, and correspond to those listed in the NHS national maternity notes.
British European England, Northern Ireland, Scotland, Wales
Irish European Ireland (Republic of)
North European Denmark, Finland, Iceland, Norway, Sweden,
East EuropeanAlbania, Bulgaria, Hungary, Latvia, Poland, Romania, Slovakia, Ukraine
South European Cyprus, Greece, Italy, Malta, Portugal, Spain
West European Austria, Belgium, France, Germany, Netherlands, Switzerland
North AfricanAlgeria, Egypt, Libya, Morocco, Sudan, Tunisia
East AfricanEritrea, Ethiopia, Kenya, Madagascar, Mauritius, Somalia, Tanzania, Uganda
Central AfricanCameroon, Central African Republic, Chad, Congo, South Sudan
South African (Black)Angola, Botswana, Mozambique, Namibia, South Africa, Zambia, Zimbabwe
South African (Euro)South African of European origin
West AfricanGhana, Ivory Coast, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone
Middle EasternIraq, Israel, Jordan, Lebanon, Saudi Arabia, Syria, Turkey
IndianIndia, Sri Lanka
ChineseChina, Hong Kong, Taiwan
Other Far EastJapan, Korea, Mongolia
South East AsianBrunei, Cambodia, Indonesia, Malaysia, Myanmar, Phillipines, Thailand
CaribbeanBarbados, Cuba, Jamaica, Puerto Rico
Mixed African European 
Mixed Asian European 
Mixed Caribbean European 
OtherAustralasia, Americas, Asia - Other
Information outcome
GROW software uses Parity to calculate the Term Optimal Weight, defined as the number of previous babies (live or stillborn) delivered at ≥ 24 weeks gestation.
NB previous birth of twins would be parity 2 not 1.
Information outcome
For stillbirths / intrauterine fetal death, the calculator adjusts the gestational age by deducting 2 days as the average estimated delay from fetal death to delivery. *

* Gardosi J, Mul T, Mongelli M, Fagan D. Analysis of birthweight and gestational age in antepartum stillbirths.
BJOG 1998;105(5):524–530.