The algorithms used for the tool above are the exact same as published by:

Anderson KM, Odell PM, Wilson PW, Kannel WB.: Cardiovascular disease risk profiles.Am Heart J. 1991 Jan;121(1 Pt 2):293-8. Abstract link 

The algorithm was used for modelling the risk of MI in the D:A:D study:

Law M, Friis-Moller N, Weber R, Reiss P, Thiebaut R, Kirk O, d'Arminio Monforte A, Pradier C, Morfeldt L, Calvo G, El-Sadr W, De Wit S, Sabin CA, Lundgren JD, for the DAD Study Group.: Modelling the three year risk of myocardial infarction among participants in the D:A:D study. HIV Med. 2003; 4(1):1-10. Abstract link

Updated: 15 Dec 2006