Trading Gold (XAUUSD) on a Prop Firm Account: Sizing Inside the Limits
How to size XAUUSD on a prop firm account: contract size, dollar stops, spread cost and the daily loss limit, with a $100K simulated example.
OctoFunded Trading DeskUpdated ยท 9 min read
Trading gold on a prop firm account works under the same loss limits as any forex pair, but the sizing math is different. XAUUSD moves in dollars and cents, its stops are usually wider than on major pairs and its spread can widen quickly. Size every gold trade from your dollar risk, the stop in dollars of price and the contract size of the exact symbol you trade.
This guide goes deeper than our lot size formula for forex pairs: it covers gold contract conventions, spread cost, the daily loss limit and a worked example on a $100K simulated account.
Key takeaways
- Think in dollars of price: a stop of $8 below entry is the cleanest input for gold, whatever your platform calls a pip.
- Check the contract size: 100 ounces per standard lot is a common convention, not a rule. Read the symbol specification before the first trade.
- Wider stops mean smaller lots: the same dollar risk buys far fewer lots on gold than on EURUSD.
- Costs come out of the same limit: spread, commission and slippage count toward the daily loss limit.
- Size from what is left today: add every open stop to today's loss before you place the next gold trade.
Why is gold different from forex on a prop firm account?
Gold is different because it is priced in dollars per ounce, moves more in dollar terms per lot and can change its spread fast around news. The prop firm rules do not change for gold: the daily loss limit and max drawdown apply to the account, whatever symbol caused the loss.
What changes is how quickly one position can use up those limits. A trader used to 2 lots on EURUSD with a 25-pip stop risks about $500. The same 2 lots on gold with an $8 stop risks about $1,600, more than three times as much. That gap is the most common way a gold trade surprises a funded account.
Three features matter for sizing:
- Price unit. XAUUSD is quoted as dollars per troy ounce, for example 2,400.00. A move from 2,400.00 to 2,392.00 is an $8 move.
- Contract size. Many providers use 100 ounces per standard lot, so a $1 move is worth about $100 per lot. Some use other sizes. This is an example convention, not an OctoFunded specification.
- Point naming. Some platforms call $0.01 a point and $0.10 a pip; others differ. Labels vary, so work in dollars of price and avoid the confusion.
How do you calculate lot size for XAUUSD?
You calculate gold lot size by dividing your dollar risk by the dollar value of your stop on one lot.
Formula: lots = dollar risk / (stop distance in dollars of price x contract size in ounces)
With a 100-ounce contract, the bottom line is simply the stop in dollars times 100. The table uses round, illustrative numbers on a $100K simulated account with a $250 risk (0.25%).
| Stop distance (price $) | Loss per lot at the stop, 100 oz ($) | Lot size for $250 risk (rounded down) | Lot size for $500 risk (rounded down) |
|---|---|---|---|
| $3.00 | $300 | 0.83 | 1.66 |
| $5.00 | $500 | 0.50 | 1.00 |
| $8.00 | $800 | 0.31 | 0.62 |
| $12.00 | $1,200 | 0.20 | 0.41 |
| $20.00 | $2,000 | 0.12 | 0.25 |
Two habits keep this math honest:
- Round down. $250 / $800 is 0.3125, so trade 0.31, not 0.32. A larger lot means a larger loss at the stop.
- Recheck the contract. If your symbol uses a different ounce size, the whole table shifts. Re-run the formula with the contract size shown in the symbol details.
To choose the percentage itself, read how much to risk per trade.
How much does the spread cost on a gold trade?
The spread on gold costs the spread in dollars of price times the contract size, per lot, and it is paid on every trade. With a 100-ounce contract, an illustrative spread of $0.30 costs about $30 per lot.
That sounds small until you compare it with your stop. On a $3 stop, a $0.30 spread is 10% of the risk. On a $12 stop it is 2.5%. Tight stops on gold pay a larger share of their risk to costs.
Spreads can also widen around major economic releases and the daily rollover. These figures are illustrative, not quotes from any provider:
| Condition | Illustrative spread (price $) | Cost per lot, 100 oz ($) | Cost on 0.62 lots ($) |
|---|---|---|---|
| Normal session | $0.30 | $30 | $18.60 |
| Around a major release | $1.00 | $100 | $62.00 |
| Daily rollover | $1.50 | $150 | $93.00 |
Slippage comes on top. In a fast move, a stop can fill some dollars past its level, and on 0.62 lots every $1 of slippage adds about $62 of loss. A practical fix is to subtract a cost allowance from the risk before you size, for example size for $230 instead of $250.
How do the daily loss limit and drawdown cap gold size?
The daily loss limit caps the total gold risk you can hold at once, counting every open stop and today's closed losses. At OctoFunded, the daily loss limit is 5% on the 2-Step, 4% on the 1-Step and 3% on Instant Funded.
On a $100,000 simulated account, those limits allow this many full-size gold losses in one day:
| Program | Daily loss limit ($) | Max drawdown ($) | Drawdown type | Losses of $500 that fit in one day |
|---|---|---|---|---|
| 2-Step | $5,000 (5%) | $10,000 (10%) | Static | 10 |
| 1-Step | $4,000 (4%) | $8,000 (8%) | Trailing | 8 |
| Instant Funded | $3,000 (3%) | $6,000 (6%) | Trailing | 6 |
The last column is a ceiling, not a target. It ignores spread and slippage, and it assumes nothing else is open. Read how the daily loss limit is measured before you plan around exact figures, because firms count floating losses and reference balances in different ways.
The max drawdown matters over weeks. Under static and trailing floors, the room you have depends on where the floor sits today. On the 1-Step and Instant, the floor is trailing, so a good run on gold can lift it, and the room for the next trade may be smaller than the starting balance suggests.
What does a gold trade look like on a $100K simulated account?
Here is an illustrative 1-Step day on a $100,000 simulated account, using the common 100-ounce contract. Prices, stops and spreads are examples, not trade ideas or OctoFunded quotes.
- Daily loss limit: 4% of $100,000 = $4,000.
- Planned risk per trade: 0.25% = $250, with a $20 cost allowance, so size for $230.
- Trade 1: buy at 2,400.00, stop at 2,392.00. Stop distance $8. Loss per lot at the stop: $8 x 100 = $800. Lots: $230 / $800 = 0.2875, rounded down to 0.28.
- Trade 1 result: stopped out with $0.50 of slippage. Loss: $8.50 x 100 x 0.28 = $238, plus a $0.30 spread, $0.30 x 100 x 0.28 = $8.40. Total about $246.40.
- Room left today: $4,000 minus $246.40 = $3,753.60.
- Trade 2: a wider setup with a $12 stop. Loss per lot: $1,200. Lots: $230 / $1,200 = 0.1916, rounded down to 0.19. Planned loss at the stop: $12 x 100 x 0.19 = $228.
After two full losses the day would be down about $474 plus costs, well inside the $4,000 limit. Compare that with sizing gold like forex: 2 lots on an $8 stop is $1,600 at the stop, so two losses would use $3,200, or 80% of the daily limit.
Gold also tends to deliver large single days. On the 1-Step, the best day rule caps any one day at 50% of total profit, and Instant Funded caps it at 20%. One outsized gold win can make that rule the binding one, so track your best day as you go.
How do you trade gold safely under prop firm limits?
Trade gold under prop firm limits by deciding the dollar risk first and letting the stop and contract size set the lot.
- Read the symbol specification. Contract size, minimum lot step and trading hours. Check that gold is on your account's symbol list.
- Place the stop from the chart. Put it where the idea is wrong, then measure it in dollars of price.
- Size with the formula and round down. Include a cost allowance for spread and slippage.
- Use a smaller percentage than on forex if your gold stops are much wider. Fewer lots, same discipline.
- Avoid entries around major releases and the rollover if your plan does not account for wider spreads.
- Count correlated exposure. Gold and some dollar pairs often react to the same news. Treat them as one larger position.
- Track today's room. Before each trade, add open stops to closed losses and compare with the daily limit.
- Code it if you automate. OctoFunded allows EAs; a gold EA should read contract size from the symbol, not assume it.
FAQ
How much is a $1 move in gold worth on one lot?
With the common contract of 100 ounces per standard lot, a $1 move in XAUUSD is worth about $100 per lot. Contract sizes differ between providers, so check the symbol specification on your account before you size.
Is a pip in gold the same as a pip in forex?
No. Gold is quoted in dollars and cents, and providers define a pip or point for XAUUSD in different ways. Size your gold trades from the stop distance in dollars of price, which avoids the confusion.
How much should I risk per gold trade on a funded account?
There is no single number, but the stop must be sized so several losses in a row fit inside the daily loss limit with a buffer. Many traders use a smaller percentage on gold than on major forex pairs because the stops are wider and spreads can jump.
Do spread and slippage count toward the daily loss limit?
Yes. Any cost that reduces your equity counts toward the loss limits, including spread, commission and slippage. On gold these can be larger than on major forex pairs, so leave room for them.
Can I trade gold with an EA on OctoFunded?
OctoFunded allows EAs on every program, under the same limits as manual trading. Check the symbol list in your account, and for setup questions write to [email protected].
Size gold from the rules, not the habit
Gold rewards a sizing routine more than most symbols, because one wide stop at the wrong size can take a large part of a day's limit. OctoFunded runs the 2-Step, 1-Step and Instant Funded on simulated capital, with daily limits of 5%, 4% and 3%, a one-time fee and no time limit. Read the OctoFunded program rules, then size your first XAUUSD trade with the formula above.
