The exchange rate is approximately 4,000-4,100 Riel to one U.S. Dollar, and this rate remains relatively stable. In practice, you can pay for most things in dollars, and you'll receive change under $1 in Riel. There's no need to worry about converting between currencies—locals handle mixed-currency transactions seamlessly.
Riel banknotes come in denominations from 100 to 100,000, while coins are rarely used. For small purchases under $1, having some Riel is convenient. U.S. dollar bills should be in good condition—torn, worn, or heavily marked notes may be refused, so bring clean, newer bills from home.
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