Dotty, you are shipping worldwide from the UK. I see your listings in USD. Anybody in another country should see your listings in their currency.
So if it were me, I'd not see a point in guessing how much my item was in another country. You make your price in your currency, that is what you want and that is what you will get, because you will still receive your payment in your currency in your shop payment account or Paypal etc.