Pick a US price and see what Steam games at exactly that price charge in each other market: the most common local price and the median, in the market's own currency — what the store actually shows, with no exchange rate involved.
You get a table of markets with the local price most games at your US price charge there, in local currency.
The calculators are free and need no account. A free account keeps your work: save launch plans, follow your own games on My games, and get alerts for the games you watch.