Amount of concrete for a shed base Post your questions and find answers on all garden related topics and areas

[DaveK??]

I'm taking on a project to make a concrete base, roughly 11ft by 7ft, for a 10ft by 6ft shed. I am unsure how much cement I need, i.e how many 20kg or 25kg bags I need to buy? I am laying old broken bricks and stones as the base. Any advice would be greatly appreciated.