A potential customer would like shipping rates for an item from my state to China. How do I go about calculating the cost?

@coriander441 I just looked at your listings and you do have international shipping set up. The buyer can clearly see the shipping price. As such, I wonder whether the buyer might be trying to set you up for a text scam. EXAMPLE: https://www.ebay.com/itm/146593609562 If the buyer puts in China, this is what they see: