This fabric is sold in half metre increments with a quantity of 1 being a half metre (50cm) and a quantity of 2 being one metre (100cms).  Any fabric that you order will be cut in one continious length, for example - if you order a quantity of 3, you will receive a 1.5 metre continious length.
 
50cm = 1 item
1m = 2 items
1.5m = 3 items
2m = 4 items
2.5m = 5 items
3m = 6 items
3.5m = 7 items
4m = 8 items
4.5m = 9 items
5m = 10 items
And so on...