If you size a gold trade the way you size EUR/USD, you are carrying roughly ten times the risk you think you are. This is the arithmetic, worked through properly, with the two numbers that cause almost every blown gold account.
The short answer
Lots = risk amount ÷ (stop distance in dollars × 100)
Risking $100 with a $5.00 stop: 100 ÷ (5 × 100) = 0.20 lots. The rest of this article explains where the 100 comes from and why it matters so much.
Why gold breaks the habits you built on currency pairs
A standard lot of EUR/USD is 100,000 units of the base currency. A standard lot of XAU/USD is 100 troy ounces. Those two numbers look similar in the order ticket — both say “1.00 lot” — and they are not remotely comparable in what they expose you to.
The problem is that the interface hides the difference. Your platform shows the same lot field, the same 0.01 minimum, the same leverage. Nothing warns you that the contract underneath has changed shape entirely.
Here is the comparison that matters. A big day in EUR/USD might be 100 pips, which on one standard lot is about $1,000. A perfectly ordinary day in gold is a $20 to $40 range, which on one standard lot is $2,000 to $4,000. Same “1.00 lot” in the ticket, several times the daily swing.
The two numbers you actually need
Forget pips for a moment. Gold is easier to reason about in dollars of price movement, because that is how the contract is actually denominated.
1. Contract size: 100 ounces per standard lot
One standard lot is 100 oz. A mini lot is 10 oz. A micro lot is 1 oz. Most brokers allow 0.01 lots as a minimum, which is one ounce.
2. Value of a $1.00 move: $100 per standard lot
This follows directly. If you hold 100 ounces and the gold price moves one dollar, your position changes by 100 × $1.00 = $100.
| Position | Ounces | Per $1.00 move | Per $10.00 move |
|---|---|---|---|
| 1.00 lot (standard) | 100 | $100 | $1,000 |
| 0.10 lot (mini) | 10 | $10 | $100 |
| 0.01 lot (micro) | 1 | $1 | $10 |
A note on gold “pips” — where the confusion starts
Ask three traders what a gold pip is and you may get three answers. Some brokers treat 0.01 as one pip, which makes a pip worth $1.00 per standard lot. Others treat 0.10 as one pip, making it $10.00 per standard lot. A few call the 0.01 increment a “point” and reserve “pip” for something else.
This is not a trivial naming argument. If you assume the wrong definition you will be out by a factor of ten in either direction — either taking a tenth of the position you intended, or ten times it.
Sidestep the problem entirely
Work in dollars of price movement rather than pips. “My stop is $5.00 away” is unambiguous at every broker on earth. “My stop is 500 pips away” is not. Our position size calculator shows you both, and states the pip definition it is using.
The calculation, step by step
Take a concrete trade. Account of $10,000, risking 1% per trade, entry at 2,410.00 with a stop at 2,405.00.
Convert your risk percentage into money
1% of $10,000 is $100. This is the maximum the trade may cost you if the stop is hit. Decide it before you look at the chart, not after.
Measure the stop in dollars
2,410.00 − 2,405.00 = $5.00. Place the stop where your reasoning is proven wrong — at a structural level — not at a round number that happens to feel affordable.
Work out what one lot would cost you
A $5.00 move on one standard lot (100 oz) = 5 × 100 = $500. That is five times your intended risk, from a stop that looked small on the chart.
Divide
$100 ÷ $500 = 0.20 lots. Or as a single formula: risk ÷ (stop in dollars × 100).
Check the answer backwards
0.20 lots is 20 ounces. A $5.00 adverse move × 20 oz = $100. Matches the intended risk. Always do this step — it catches decimal-place errors instantly.
The same trade at four account sizes
Risking 1% with a $5.00 stop, the position scales with the account and nothing else:
| Account | 1% risk | Position size | Ounces held |
|---|---|---|---|
| $1,000 | $10 | 0.02 lots | 2 oz |
| $5,000 | $50 | 0.10 lots | 10 oz |
| $10,000 | $100 | 0.20 lots | 20 oz |
| $50,000 | $500 | 1.00 lot | 100 oz |
Read the last row carefully. A full standard lot of gold, at a conservative 1% risk with a tight $5.00 stop, is appropriate at around $50,000. If your account is $5,000 and you are trading one lot, you are risking roughly 10% of the account on a five-dollar move — and gold moves five dollars in minutes.
Three mistakes that cost people accounts
Sizing gold like a currency pair
The most common, and the most expensive. One lot felt fine on EUR/USD, so one lot feels fine on gold. It is not the same instrument and it is not the same risk.
Setting the stop too tight for gold’s volatility
Reducing the stop makes the calculator hand you a bigger position, which feels like progress. But a $2.00 stop on gold sits inside ordinary noise — you will be stopped out repeatedly and correctly. Size the stop to the instrument’s actual behaviour, using something like ATR, then let the position size follow from it. Never the other way round.
Letting available margin decide the size
At 1:100 leverage, one lot of gold at 2,410 needs about $2,410 of margin. On a $10,000 account the platform will happily let you open four lots. That the margin permits it says nothing about whether the risk is survivable. Margin is a deposit requirement; it is not a position-sizing method.
Run your own numbers
The Doctor Forex Global calculators handle XAU/USD with the correct 100-ounce contract, alongside the major pairs and yen crosses. Position size, pip and point value, risk-to-reward, profit and loss, and margin — all in your browser, nothing sent anywhere.
Where to go from here
Position sizing is one piece of a larger structure. If the terms in this article were unfamiliar, work through Forex Education from the beginning — it covers contract sizes, leverage and margin in order. If you are comfortable with the mechanics but your results are inconsistent, the problem is more often process than analysis, and Trading Guides covers building a plan you will actually follow.
Trading gold, foreign exchange and other leveraged products carries a high level of risk and can result in the loss of all invested capital. Contract specifications, pip definitions and margin requirements vary by broker and account type — always verify against your own platform before trading. The figures in this article are illustrative and exclude spread, commission, swap and slippage. Nothing here is financial, investment or trading advice. See our full Risk Disclaimer.