When I watch the finance section of ABC (the Australian one) news, they talk about how the Australian dollar is faring against the US dollar plus a handful of other currencies. The problem is, I don't know whether it's that the Australian dollar is going up or down, or the US dollar changing.

How can I determine how a currency I'm interested in (the Australian dollar) is doing in and of itself against the rest of the world as a whole?

  • 2
    Look at the "handful of other currencies" and see how much of that motion is in the same direction and by the same percentage. That's as close to an independent number as you are likely to get
    – keshlam
    Jul 10, 2016 at 16:28
  • 4
    What would you want to do with such information? In practice, if you're looking at two currencies, there is not much difference between one going up and the other going down. All that matters is their relative value. Even if more countries are involved in the comparison, the details are unlikely to matter to an average person. It's unlikely, for instance, that you'll be able to find an arbitrage opportunity by trading through obscure currencies.
    – BrenBarn
    Jul 10, 2016 at 18:21

4 Answers 4


What you want is the average change in rate of the Australian Dollar against multiple other currencies, to even out the effect of moves in a single other currency.

People often look at the trade-weighted exchange rate to get an idea of this, as it allows you to look at the currencies that are most relevant, rather than every tiny other currency having an equal weight.


If you're interested in slower scale changes, one option is to use indexes that value a common commodity in different currencies such as the Big Mac Index. If a Big Mac costs more in AUD but stays the same in USD, then AUD have gone up.


The best answer to your question would to be what the interest rates are like in Australia itself.

The Reserve Bank sets the target ‘cash rate’, which is the market interest rate on overnight funds. It uses this as the instrument for monetary policy, and influences the cash rate through its financial market operations. Decisions regarding the cash rate target are made by the Reserve Bank Board and explained in a media release announcing the decision at 2.30 pm after each Board meeting. (Prior to December 2007, media releases were issued only when the cash rate target was changed.)

From Investopedia:

How Rates Are Calculated

Each central bank's board of directors controls the monetary policy of its country and the short-term prime interest rate that banks use to borrow from each other. When the economy is doing well, interest rates are hiked in order to curb inflation and when times are tough, cut rates to encourage lending and inject money into the economy.

What I suggest you do

  1. Have a look at this from graph from http://www.rba.gov.au/monetary-policy/int-rate-decisions/

  2. I would then go to a website that allows you to compare, graphically, whichever interest rate you want.(Or you could get the raw data and run some analysis, to each his own)

  3. I would choose some sort of Australian LIBOR rate and then compare it to the currency.

FYI, this topic (FX) is incredibly complex and I hope my answer satisfies your needs.Otherwise, talk to a quant. You will need a ton of data inputs to model the entire economy of Australia to try and predict what the central bank will do, which is what people try and do everyday.

Best of luck!


To make it simple, just use gold as the main benchmark. Gold price never moves, FIAT currencies move around the price of gold.

So, when comparing US$ and Australian dollars to the gold, you know which currency is moving up and which down.

  • 1
    Consider: A new technology comes to market for (say) super highspeed/low power microprocessors, but it requires mass gold to fabricate -- the price of gold everywhere will go up, does this mean that all currencies have devalued? Alternatively, consider a new cheap, safe, and high yield process for refining gold from raw ore/existing tailings comes to market. The price of gold everywhere will go down. Does this mean all currencies have increased in value? Aug 8, 2016 at 0:35

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