The currency of Cambodia is ... the USDollar. Of course,
this is not officially so. But in fact it is at least in Phnom
Penh and in Angkor almost all goods and services are calculated
and paid for in the US currency. But there is a national
currency, even though you may not use it at all during stays in
Phnom Penh and Angkor. The national currency is the Riel and
there are bank notes of 100, 200 and 500 Riel.
Usually, this currency is only used instead of US Cents.
You will pay, for instance, the drivers of Rickshas (called "Cyclo"
or motorcycle taxis in Riel (500 to 1,000 Riel per trip), or the
baguette at the local bakery (300 to 500 Riel per loaf).
Exchange
For travellers to Cambodia carrying US Dollars, in small as
well as large denominations, there is no need to exchange
currency at any time. You automatically acquire possession
of Riel when paying in US Dollars and receiving the change below
one Dollar in Riel.
For a marginally better rate, Dollars can be exchange into Riel
at sidewalk money changers.
Currencies other than US Dollars can be exchanged at the banks.
It is recommended to bring a sufficient amount of US Dollars
for the entire duration of your stay.
Banks are usually open Monday to Friday (except on holidays)
7.30 am to 2.30 pm. Some banks also open on Saturdays from
7.30 am to 2.30 pm.
This page: http://www.cockatoo.com/english/cambodia/cambodia_currency.htm
