Although the IRB produce a complex and continually updated ranking for men's international rugby they do not compile any ranking system for the women's game. Rugby statistician Serge Piquet has produced a currently unofficial, but generally accepted, world ranking, but where rankings are referred to by some boards these will normally be the finishing positions in the previous Women's Rugby World Cup (which only takes place every four years and will only include those countries that qualified for the finals).
The IRB's seedings for each World Cup are also influenced by positions in the previous tournament, but not entirely decided by them. The table below shows the final positions for the 2014 tournament and is therefore the closest thing to an "official" IRB ranking:[1]
Rugby Europe, formerly known as FIRA-AER, do produce an annual ranking of European nations, based on previous season's Rugby Europe and Six Nations competitions, for use in RE tournaments (though Six Nations teams are often given a higher seeding in tournaments than their ranking might suggest). As these will be based on more recent performances they can contradict the IRB list and also include countries not featuring in the World Cup-based ranking. On the other hand, they obviously only include European nations. Rankings[2] (based on previous season results) appear to be:
Detailed results from a small number of tournaments, especially in Africa and Asia, have never been published. The following table therefore relates to the published tournament results. Note: Almost all of New Zealand's sevens matches - apart from the 2009 World Cup and qualifier and two Hong Kong Sevens - have been played by "Aotearoa Maori" and (before 2000) "New Zealand Wild Ducks". While in some cases they were officially sanctioned by the NZRU, neither were full New Zealand teams, and occasionally included players not eligible to play for New Zealand. As a result, they are not included in the table below. The playing record of these unofficial New Zealand teams is: Played 59, Won 55, Lost 4, 93.22%.
As with rankings for 15-a-side rugby, IRB rankings for Sevens are based on the finishing positions in the previous World Cup. The table below shows the final positions for the 2009 tournament:
Rugby Europe also produce an annual ranking of European nations, based on previous season's REchampionships which are used for the following season's tournaments. Current rankings are:
France(1); 
Netherlands(1)
Sweden(3)
Italy(4)
Belgium(6); 
Great Britain(5)
Canada(9); 
England(7); 
United States(9); 
Wales(7)
Germany(11); 
Spain(10)
New Zealand(12); 
Soviet Union(13); World XV(14)
Japan(15)
Ireland(16); 
Kazakhstan(18);
Scotland(16)
Australia(20); 
Russia(19)
Portugal(21)
Hong Kong(22)
Samoa(23)
Denmark(24); 
Jamaica(26); 
Norway(24); 
Trinidad and Tobago(26)
Austria(29); 
Cayman Islands(31); 
Czech Republic(29); 
South Africa(28)
Bosnia and Herzegovina(34); 
Uganda(32); 
Rwanda(32); 
Thailand(34)
China(40); 
Fiji(36); 
Guyana(39); 
Kenya(38); 
Singapore(40);
Tonga(37)
Finland(42); 
Luxembourg(42); 
Romania(42); 
Serbia(42); 
Zambia(46); 
Zimbabwe(46)
Brazil(48); 
Kyrgyzstan(49); 
Uzbekistan(49)
Barbados(51); 
Malaysia(53); 
Saint Vincent and the Grenadines(52)
Bahamas(54); 
Caribbean XV (55)
Laos(57); 
Philippines(58); 
Switzerland(56)
Botswana(59); 
Namibia(59)
England
France
Ireland
Italy
Wales
Scotland
Spain
Netherlands
Sweden
Russia
Finland
Germany
Belgium
Romania
Luxembourg
Norway
Serbia
Denmark
Bosnia-Herzegovina
Switzerland
Kazakhstan
Australia
New Zealand
South Africa
United States
Canada
China
Brazil
Japan
Thailand
Uganda
Portugal
Moldova
Ukraine
Latvia
Czech Republic
Andorra
Croatia
Austria
Bulgaria
Israel
Malta
Poland
Hungary
Georgia
Lithuania
Slovenia