The amount of lava stones depends on the size of the barbecue. For smaller grills, about three kilograms, for larger grills up to six kilograms are needed. Counting the lava stones would be a bit tedious. As a rule, they are measured in kilograms. For the small camping barbecues, the three-kilogram packets are often enough. Since table barbecues and lava grills with trolleys have a larger grilling surface, an average of about four to six kilograms of lava stones are needed.
Lava stones are available in various quantities. You can find small boxes with only one kilogram up to 25 kilogram bags. When buying, also pay attention to the size of the individual stones.