Gold (XAU/USD): how it differs from currencies

A currency pair compares two monies. USD/ZAR tells you how many rand one dollar buys. Gold is a metal. XAU/USD tells you how many dollars one troy ounce of gold buys. The code XAU is the standard symbol for one troy ounce of gold. So the price 18.4100 on USD/ZAR and a gold price near 2,400 are not the same kind of number. One is an exchange rate. The other is a commodity price in dollars.

That difference matters because the rand value of a gold move depends on two prices at once. Gold moves in dollars, and your account is in rand. If gold rises by one dollar and USD/ZAR stays at 18.4100, the rand value of that move is R18.41 per ounce. If gold does not move but USD/ZAR moves, the rand value of your gold position changes too. You are not trading one market. You are trading gold in dollars and the dollar against the rand at the same time.

This is why two traders can hold the same gold position and get different rand results. One may have entered when USD/ZAR was 18.0000 and the other at 18.4100. The gold price is identical. The rand outcome is not. Before you size a gold trade, you need the gold price, the USD/ZAR rate, and your lot size. The page already gives the pip value at 18.4100. This section explains where that number comes from.

On most currency pairs, one pip is 0.0001 of the quoted price. On USD/ZAR, a move from 18.4100 to 18.4101 is one pip. Gold is quoted with two decimal places, so one pip on XAU/USD is usually 0.01 of a dollar. A move from 2,400.00 to 2,400.01 is one pip. Your broker may define it differently, so check the contract specification before you trade. The definition is not universal.

The contract size is what turns that pip into money. A standard lot of gold is often 100 troy ounces. If one pip is 0.01 dollars per ounce and you hold 100 ounces, one pip is 0.01 × 100 = 1.00 dollar. At USD/ZAR 18.4100, that is R18.41 per pip on a standard lot. On 0.10 lots, you hold 10 ounces, so one pip is 0.01 × 10 = 0.10 dollars, or R1.84. That R1.84 is the figure the page uses. It is not a fixed number. It moves when USD/ZAR moves.

Currency pairs work the same way, but the contract size is different. A standard lot on EUR/USD is 100,000 units of the base currency. One pip is 0.0001, so one pip is 10 dollars on a standard lot. At 18.4100, that is R184.10. On 0.10 lots it is R18.41. Compare that with gold on 0.10 lots at R1.84 per pip. Gold's pip is smaller in rand, not larger, at these contract sizes. The page says one pip on gold is about ten times a currency pip. That holds when the contract sizes are matched in the way the page assumes. It does not hold if you compare a standard lot of gold with 0.10 lots of EUR/USD. Always check the contract size on your platform.

A stop distance in pips only means something next to the instrument's normal range. If gold typically moves 200 pips in a day and you set a 20-pip stop, you are risking a stop-out on ordinary noise. If EUR/USD typically moves 80 pips in a day, a 20-pip stop is a quarter of the day's range. The same number, 20, sits in a different place on each chart. This is why copying a stop distance from one instrument to another is unsafe. The pip count is not the risk. The rand loss is the risk.

Gold's daily range is often several times wider than a major currency pair's. That is not a reason to avoid it. It is a reason to use a smaller lot size. If you want to risk R50 and your stop is 20 pips at R1.84 per pip, the loss is R36.80. That fits. If you use 0.20 lots, one pip is R3.68 and a 20-pip stop risks R73.60. That does not fit. The stop distance did not change. The lot size did. The rand risk changed with it.

The practical rule is to work backwards. Decide the rand amount you are willing to lose on the trade. Find the rand value of one pip on your chosen lot size. Divide the first by the second to get the maximum stop distance in pips. If that distance is too tight for gold's normal range, reduce the lot size and try again. Do not widen the stop to make the lot size fit. Widening the stop increases the loss. Reducing the lot size does not.