How much in US dollars is 100 euro?

The current conversion rate for Euros to USD is 1 to 1.35. Using the current rate, 100 Euros would be the equivalent of about 135 USD.

However - -

Exchange rates change every day so any specific answer posted here becomes out of date almost immediately. While it's not Answers.com policy to say "use the internet", that's the best approach in this case. You can check a site such as www . xe.com, CNNMoney, etc. for the latest conversion factors.