Size a Gold Trade Using the Contract Specification

[Fairman]

Size a Gold Trade Using the Contract Specification

Scenario: an 8,000-dollar account, 1 percent risk, trading XAU/USD with a stop 10 dollars below entry. Your broker's specification lists the contract size as 100 ounces per standard lot.

Work it out. The risk amount is 80 dollars. A one-dollar move in gold on one standard lot of 100 ounces changes the position value by 100 dollars. A 10-dollar stop therefore risks 1,000 dollars per standard lot.

Lot size: 80 divided by 1,000 is 0.08 lots.

Answer: 0.08 lots.

Notice how small the position is. A trader who uses 0.50 lots on EUR/USD out of habit, and then trades gold at 0.50 lots, would risk 500 dollars on the same 10-dollar stop, more than six times the plan.

Also notice the unit. In forex, we speak in pips. In gold, price moves in dollars and cents, and brokers define the tick size and tick value differently. Read the specification for your own broker. Some quote gold with two decimals, and some count a point as 0.01.

Daily ranges in gold are often 20 to 40 dollars or more, so a 10-dollar stop may be tight for swing trades. Wider stops mean smaller lots.

Takeaway: for any instrument outside the major currency pairs, start from the contract size and tick value, never from forex intuition.

Practical step: open your platform's specification for gold and write down contract size, tick size, and tick value.

[FXS HongKong Scalper]

Correct. Contract size is the critical detail. One standard lot of XAUUSD is 100 oz at most places we've used, but a few CFD providers define a lot as 10 oz or even a single ounce, so the same 0.08 lots could be a very different risk depending on the platform.

We check the tick value in the symbol specification instead of relying on the contract size alone, because some brokers also quote gold with a different number of digits. A quick test with 0.01 lots and a known move confirms the calculation before putting real size on.

[Fairman]

The sizing checks out. With 100 ounces per standard lot, a 10 dollar move in gold changes the position value by 1,000 dollars per lot, so 80 dollars of risk allows 0.08 lots. The comparison with EUR/USD habits is the important warning. At 0.50 lots, a 10 dollar stop in gold risks 500 dollars, more than six times the 80 dollar plan. Traders moving from currencies to gold often keep their usual lot sizes and then experience losses far larger than expected. Calculating from the contract specification every time avoids that trap entirely.

[Fairman]

The point about units and tick sizes is worth stressing. Some brokers quote gold to two decimals, such as 2,350.45, and call each 0.01 a point. Others quote to three decimals. Some define a pip in gold as 0.10, others as 0.01, and some don't use the term at all. Pip value calculators set up for forex may give the wrong answer for gold unless they're configured for the instrument. Reading the broker's specification, which lists contract size, tick size, and tick value, gives the definitive figures for sizing. Different brokers can differ, so check each one used.

[Fairman]

The daily range comment is a useful context check. If gold's average daily range is 30 dollars, a 10 dollar stop is a third of a day's movement, which is tight for a swing trade but reasonable for an intraday setup. A swing trade might need a stop of 25 or 30 dollars, which at 80 dollars of risk allows only about 0.03 lots. Using an ATR based stop, as discussed in the ATR sizing thread, scales the size automatically. Gold's volatility can also change sharply around major economic data and geopolitical events, so the ATR should be checked regularly.

[Amanhasnoname]

Gold was where I made my most expensive sizing mistake. Early on I carried my EURUSD habit of 0.30 lots straight over to XAUUSD with a stop of about 6 dollars, and when it hit I lost roughly 180 dollars on an account where my plan was 30. The platform showed a perfectly normal looking order, which is why it slipped past me.

After that I wrote a small card with the contract size, tick size and tick value for each instrument I trade, taken from the specification window of the broker. Gold at my broker is 100 ounces a lot with prices to two decimals, so one dollar is one hundred points on my chart, and I size from the dollar stop distance every time.

One more check I do is placing a 0.01 lot test order on a new broker and watching the profit field move by a known amount. It costs a few cents and confirms the maths before I put the real size on.

[Fairman]

Writing down the contract size, tick size, and tick value, as the practical step suggests, is a good habit for any new instrument. It takes a few minutes and prevents costly sizing errors. The same applies to indices, oil, and other CFDs, where contract sizes vary widely between brokers. Has anyone here made a sizing error when switching to gold or another non currency instrument? It would be useful for others to hear what happened, since these errors are common and often only noticed after a much larger loss than planned.