Or how much fondant icing you need to cover different sizes of cake? Our cake calculator will give you the perfect recipe – whatever tins you have in – with a choice of four different flavours ...

Using her calculator below, simply enter your tin shape and size or the number of people you want to serve and you’ll get a bespoke recipe for her classic Christmas cake – with your choice of ...

To find out the climate impact of what you eat and drink, choose from one of the 34 items in our calculator and pick how often you have it. All figures for each food in the calculator are global ...