As of Wednesday, September 13, 2006

1 Cambodian Riel = 0.0002520 US Dollar
1 US Dollar (USD) = 3,968.24 Cambodian Riel (KHR)

Earlier this year, I had no problem with spending and using US currency, even with $20's and $50's. Of course, the street vendor selling water, soda and beer may have trouble changing bigger bills, but when shopping in the market, the vendors would often give you change in both US dollars and Riel. You might have to wait a while until they run to the guy down the street but usually, no problem.