How can I calculate brick wall load on slab?

Bricks weigh about 22 Kilonewtons per square metre when combined with mortar. Structural engineers will write it like this:

A brick wall is usually four inches or 100mm wide, so the load per metre of height of the wall is:

Your wall will be perhaps one storey high, so probably about 2.5m in height, so the total wall line load on your slab is:

A wall load is a line load, which means that you have to work it out in units of kN per metre.