Stripe is currently available in 33 countries. The charges vary country by country. As a thumb rule, Stripe charges are ~ 6%.
This Google Sheet compares all 33 Stripe countries. Make a copy if you wish to edit it.
Stripe charges depend on four main factors.
Business Location: The country where your company (and bank account) is registered.
Customer Card Type: Local cards are charged less while international cards are charged about 1.5% more.
Presentment Currency: The currency in which you bill your customers.
Payout Currency: Your local currency. Stripe usually pays you only in your local currency. Stripe charges a 2% currency conversion fee if your Payout Currency is different from your Presentment Currency. :(
Highest Stripe Charge Countries.
Assuming your presentment and payout currencies are the same, top-3 countries with highest Stripe charges are ...
Hong Kong (6.25%)
Lowest Stripe Charge Countries
Again, assuming your presentment and payout currencies are the same, European countries have the lowest Stripe charges (2.15% and 3.65% for local and international cards respectively).
Within EU, Norway has the highest Stripe charges (4.90% and 5.40% for local and international cards respectively).