Cambodian riel (R) is the official tender in Cambodia but the US dollar is the de facto currency and the most useful for the average visitor to Cambodia. Most hotels and restaurants, shops, taxis, buses and airlines set their prices in US dollars. Even the visa prices and departure taxes are set in US dollars. Small transactions (less than a dollar) are usually done in Cambodian riel. Change of less than $1 is given in riel. Always carry some small riel for motorcycle taxis (motodups), snacks and other small purchases.