thanks pierce.
welcome Vamp, cool name BTW.
If you go to the official dukan site, you can use the calculator by only signing up a registration, no money is exchanged nor asked for. I have done it twice as Iforgot my sign in LOL,
here is the link it asks a few questions and then will tell you how long to do attack for and how long it expects you to be on cruisee....so far for me its pretty spot on (apart from christmas...oops)
its only expensive in that you buy a lot of meat, but it gets nearly out weighed by the lack of bread, pasta, potatoes, crisps, sweets, rubbish stuff. give it a go for a few weeks and see how you go.