The Olympic Delivery Authority (ODA) wants fans to start booking their journeys now to avoid delays and overcrowding come 2012.
It is the first time such a tool has been specifically developed for an Olympic and Paralympic Games.
The covers the whole of Britain and includes services by rail, coach, bus, river and tube with a link through to purchase ticket from the relevant provider.
It also details routes for cycling and walking, and from early next year will allow users to plan their journeys by car.
Officials say the recommended routes will avoid overcrowded stations and sections of line.
Event has also created an , which has details of where NOCs will be holding their parties, venues that are still available for hire during the Games and also the road routes that will be most congested in July, August and September next year.
"The nations’ transport networks will be extremely busy on routes leading to Games venues next summer and we have worked closely with travel providers to ensure people will be able to get to their events while maintaining background services," said ODA director of transport Hugh Sumner.
Locog chair Seb Coe said getting spectators to events on time and back home again is going to make a "huge difference" to how people remember the Games in years to come.
"Next summer will be incredibly busy, and as much as possible is being done to make London 2012 a public transport Games. This spectator journey planner will be a really useful tool and help people decide on the best ways of travelling next summer," he added.
The tool was created in partnership between the ODA, Locog, the Department for Transport and official Games technology partner ATOS.
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