About this tool
Comparing currencies by their raw KHR values can be misleading because one unit of each currency starts at a different size. This page compares how selected NBC reference rates moved relative to their own starting values during a chosen period. Each line is rebased so its first available observation equals 100; a later index above 100 means that currency's KHR-per-unit reference value rose from its own start, while an index below 100 means it fell. The common index lets Cambodian students, bookkeepers, and small businesses compare direction and percentage movement without treating a larger nominal rate as stronger performance. The comparison table reports the latest observed value, the change from first to last observation, the minimum and maximum, and volatility from daily percentage changes. You can also inspect a cross-rate between currencies that NBC may not quote directly in one row. These calculations describe the selected NBC bulletin observations only. They do not represent executable market prices: a bank or money changer will quote differently. A line's relative movement is not a forecast, and the tool gives no investment advice.
How it works
For each selected currency, the chart filters points to the chosen dates, then divides each rate by that currency's first available rate in the period and multiplies by 100. The initial value is therefore 100 even when currencies have very different KHR-per-unit magnitudes; later values show relative percentage movement from that baseline. The table's percentage change uses the first and last observed rates: (last − first) ÷ first × 100. Minimum and maximum are the lowest and highest observed rates in the selected window. Volatility is the population standard deviation of consecutive observed daily percentage changes, not annualized and not a prediction; because missing bulletin dates are skipped, a step can span more than one calendar day. The selectable range is bounded by the API's availableDateRange. NBC history contains bulletin dates, so weekends, public holidays, and dates without a stored bulletin create gaps rather than zero values. For a quick cross-rate, the page converts the entered amount from the first currency to KHR using its latest available rate, then divides by the second currency's latest KHR-per-unit rate. This is an indicative calculation from NBC reference rates.
Use cases
- A Cambodian student can compare the percentage paths of selected currencies without confusing their different starting magnitudes.
- A bookkeeper can review how supplier currency reference values changed between the first and last recorded bulletin dates.
- A small business can compare reference-rate movement for several invoice currencies over one shared reporting period.
- A journalist can describe which selected reference series rose or fell more over a documented historical window.
- A traveler can estimate an indicative cross-rate between currencies when the NBC bulletin does not quote that pair directly.
Frequently asked questions
What does rebasing each line to 100 mean?
The chart takes the first available rate for each selected currency in the chosen period as its own baseline and sets that point to 100. Later points are that currency rate divided by its baseline and multiplied by 100. This makes relative percentage movement comparable when the currencies have very different KHR-per-unit values.
How is percentage change calculated?
For each currency, the table compares its first and last observed rates in the selected range. It calculates (last rate minus first rate) divided by the first rate, then multiplies by 100. It is the change between those two observations, not an average daily return or a forecast.
What does volatility measure here?
Volatility is the population standard deviation of consecutive observed daily percentage changes for one currency in the selected period. It is not annualized and does not predict future movement. Since only bulletin observations are used, consecutive points can be separated by weekends, holidays, or other dates without a stored bulletin.
Why does the comparison chart have gaps?
This page plots dated NBC bulletin observations. There may be no daily bulletin on weekends or Cambodian public holidays, and some dates may be absent from stored history. Missing dates are not filled with estimated values or zeros, so lines can have gaps and calculations use the observations that exist.
Are the rates prices I can trade at?
No. These are NBC reference rates, not traded rates or a promise of a transaction price. Banks and money changers quote their own buying and selling rates and may apply spreads or charges. The chart and table help compare historical reference movements; check your provider for an actual quote.
How can the tool show a cross-rate NBC does not list?
The quick cross-rate uses each currency’s latest available NBC rate against KHR. It multiplies the entered amount by the source currency rate to get a KHR amount, then divides by the destination currency rate. This is an indicative calculation from two reference rates, not a direct NBC quote or an executable market rate.
Does a stronger line mean a currency will keep rising?
No. A line above 100 means only that its KHR-per-unit reference value is above its own first observation for this period. Past relative movement does not establish what will happen next. The tool does not forecast rates and is not investment advice.
Data and accuracy
The plotted history is built from NBC daily exchange-rate bulletin observations delivered through azwebdata and stored for this tool. Data availability follows bulletin publication and ingestion, so weekends, Cambodian public holidays, delayed bulletins, and missing stored observations can leave gaps. Rates are NBC references rather than traded prices; banks and money changers may quote differently.
Sources
- NBC daily exchange rate bulletin — National Bank of Cambodia
Content last reviewed 21 October 2026