Help calculating mortar requirements

[onionsa]

I’m having a bit of a mental block while trying to get back into my patio project. I need to get materials sorted for the mortar base for the flags. I’m working on a 42m2 area (over estimate for an odd shape) and looking at a 40mm base @ 5:1 ratio of sharp sand:cement.

Could someone just talk me through the quantities I’d be needing please?

Many thanks.

 

[^woody^]

There used to be a screed calculator sticky at the top of this forum. Search for that.

 

[onionsa]

There used to be a screed calculator sticky at the top of this forum. Search for that.

Thanks will take a look