Do you mean how much in volume or how much in weight.
I find a tonne of MOT Type 1 is a little over 1 m³, maybe 1.1. or 1.2 m³
To find volume, take three dimensions and multply them together, length, breadth and depth.
e.g. 10m long by 2 m wide by 100mm deep = 2m³
Allow for compaction, perhaps 10%.
Hmmm, just realised, that weight to volume conversion is OK for sand and ballast, etc. Because I usually buy it by the tonne and store it in jumbo bags.
I've never bagged up a tonne of MOT Type1.
More info' here:
http://www.building-supplies-online...ed-limestone-granite-bulk-bag-855kg-133-p.asp
They suggest a tonne of MOT Type 1 is .7 m³. That seems a bit low to me. I would have thought it was lighter than sand or ballast, making it almost twice that, unless they're talking english tons, not metric tonnes, but that still seems low.
I think this might be one of the most confusing posts that I've done so far.