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Coffee is alchemy. An elixir that shakes your mind free of the fog of night and returns you to lucidity. 

Robusta. Arabica. Nescafé. Latte. Espresso. Mocha. Milk 'n two sugars with half a Hobnob floating at the bottom of the mug. 

And it will kill you. 

Yes, too much caffeine will be the death of you - but it takes rather a lot of it. 

Luckily those clever people over at CaffeineInformer have crunched the numbers while roasting the beans, and will tell you just how many cups you can down before the java mistress downs you. 

Simply click here and enter a caffeinated beverage along with you weight. And put the kettle on.