PayPal - Postage calculations
If you are shipping items internationally, you may want to set up a number of different postage rates.
Using your PayPal Business account, you can enable Postage Calculations and set up Flat Amount or Percentage rates for different currencies. This will be automatically applied to customers at checkout.
While logged in to your PayPal account, go to Tools, or click on Tools > All Tools from your PayPal navigation bar.
Select the Postage Calculator tool.
Enter your postage rates.