There are only 3 options for International Shipping and none of them give the option for Calculated shipping. (See Picture)

This is really annoying as I imagine some countries will be more expensive than others.
how do I know what to set shipping as $5 or $50? 

can anyone help me because I dont want to list my item worldwide & put $20 shipping on my item but the shipping ends up costing $40-$50

how am I meant to know what a fair price for shipping is if the cost can vary.