Money and tips

Cambodian currency is called Riel. But you'll have no trouble using the U.S. dollar for everyday purchases, whether in restaurants or shops. Traders make you small change in Riels.
The Euro may also be used, but small cuts in the greenback are more easily deal.
In big cities, including Phnom Penh and Siem Reap, the ATMs are available and directly deliver dollars in good rate. This is the most convenient way to change.
Payment by credit card is accepted in major hotels and luxury boutiques, subject to levy an additional fee (around 3%). The Visa Card is best known as Master Card.

Tipping is not required or included in the price of the trip. They are recommended and will vary according to the traveler budget and the level of satisfaction of the services provided.
It is advisable not to give too small tips. It is better to give nothing than give a sum too small, which may offend.
According to usage, tips are generally given in the guide and driver. To guide, to provide between 5 and 8 USD per day per traveler, if you are happy with his services. If your group consists of several participants (6 or more), each traveler can give from 3 to 5 usd. Tip for the driver is usually less important than for the guide.