You would have to know the weight of stones in one cubic foot (or another unit of volume) to know this. If "stones" refers to a unit of weight than your question doesn't make sense.
How to convert cubic meters to tons of armour rock with 2.7 specific
Each stone weighs roughly between 25-30 tons
13,243.24 tons.
2.66 tonnes per cubic meter = about 0.075 tonnes per cubic foot.
You don't. Cubic yards is volume while yards is distance.
22.5
when convert from cubic meter to tonns multply by 0.455
2.7 t
Multiply tons by 1,529.11 to get pounds per cubic yard:* 3.3 x 1,529.11 = 5,046.063 pounds per cubic yard
The density of stone ballast of a standard size is approximately 100 pounds per cubic foot that is 1.6 Metric Tons per cubic.
About .58 t
1m3 of 19mm stone = 1.36 tonne