To calculate lot size for gold, divide the amount you want to risk by the stop distance in dollars multiplied by 100, because one standard lot of XAUUSD is usually 100 ounces. For example, risking $100 with a $23 stop gives 100 ÷ (23 × 100) = 0.043, so you would trade 0.04 lots. Always round down, never up.
The XAUUSD lot size formula
On most brokers, 1 standard lot of gold = 100 oz. That gives three simple conversions:
| Lot size | Ounces | Profit/loss per $1 move in gold |
|---|---|---|
| 1.00 | 100 oz | $100 |
| 0.10 | 10 oz | $10 |
| 0.01 | 1 oz | $1 |
From that, the formula is:
Lot size = Risk in dollars ÷ (Stop distance in dollars × 100)
Where:
- Risk in dollars = account balance × risk percentage. A $10,000 account at 1% risks $100.
- Stop distance in dollars = the difference between your entry price and your stop price, in dollars of gold. An entry at 4,250.00 with a stop at 4,227.00 is a $23 stop.
Think in dollars of gold price, not pips. Brokers define a gold "pip" differently, and mixing them up is a common way to be ten times oversized.
How to calculate lot size for gold, step by step
- Decide your risk percentage before you look at the chart. Common choices are 0.5%, 1% or 2%.
- Convert it to dollars: balance × risk %.
- Find your stop where the trade idea is invalid, usually beyond a swing or structure level.
- Measure the stop distance in dollars of gold price.
- Apply the formula and round down to your broker's lot step (usually 0.01).
- Check the result: lot size × stop distance × 100 should be at or just under your risk in dollars.
Step 3 comes before step 5 for a reason. You place the stop where the market says, then let position size absorb the distance. Moving your stop closer just to trade a bigger size is how many accounts get damaged.
Our stop sizes: why gold stops are not "20 pips"
Across our 4-year backtest on XAUUSD M15, stops were placed at market structure, not at a fixed distance. The results:
- Median stop: about $23 of gold price
- 90% of stops: under about $73
- Widest stop: about $200
That range matters. At a fixed 0.10 lots, a $23 stop risks $230 and a $200 stop risks $2,000. Fixed-percentage sizing keeps each loss the same size in account terms.
We also tested tighter stops (at the swing, the fair value gap candle, or 1× ATR). They usually did worse: roughly half the return with two to three times the drawdown. Tight stops get hit by normal gold noise. You can see the full breakdown on our 4-year backtest page.
Worked examples: $1k, $10k and $100k accounts
All examples use a $23 stop (our median), round down to 0.01 lots, and assume 1 lot = 100 oz.
| Account | Risk % | Risk $ | Raw lot size | Lot to trade | Actual risk |
|---|---|---|---|---|---|
| $1,000 | 0.5% | $5 | 0.002 | below minimum | — |
| $1,000 | 1% | $10 | 0.004 | below minimum | — |
| $1,000 | 2% | $20 | 0.009 | below minimum | — |
| $10,000 | 0.5% | $50 | 0.022 | 0.02 | $46 |
| $10,000 | 1% | $100 | 0.043 | 0.04 | $92 |
| $10,000 | 2% | $200 | 0.087 | 0.08 | $184 |
| $100,000 | 0.5% | $500 | 0.217 | 0.21 | $483 |
| $100,000 | 1% | $1,000 | 0.435 | 0.43 | $989 |
| $100,000 | 2% | $2,000 | 0.870 | 0.86 | $1,978 |
Wider stops change everything
Now take the $10,000 account at 1% ($100 risk) with other stop sizes:
- $73 stop: 100 ÷ 7,300 = 0.0137 → 0.01 lots, risking $73.
- $200 stop: 100 ÷ 20,000 = 0.005 → below the 0.01 minimum. The smallest trade would risk $200, or 2%.
On the $100,000 account at 1% ($1,000 risk), the same stops give 0.13 lots ($949 risk) and 0.05 lots ($1,000 risk). Bigger accounts have more room to size precisely.
The small-account trap: when 0.01 lot is too big
Look again at the $1,000 rows. With a $23 stop, even the minimum 0.01 lot risks $23, which is 2.3% of the account. With a $73 stop, 0.01 lots risks 7.3%. With a $200 stop, it risks 20%.
This is the part most lot-size guides skip. At today's gold prices and with stops placed at real structure, a $1,000 account cannot risk 1% per trade on most setups. Your options are:
- Skip trades whose stop is too wide for your account.
- Accept higher risk knowingly, and understand what that does to drawdowns.
- Trade on demo or build the account until 0.01 lots fits your risk rule.
- Use a smaller contract if your broker offers one (some offer micro or cent accounts; check the specification).
Tightening the stop to make the maths work is not on the list. Our research shows it usually makes results worse.
How risk per trade affects drawdown
Choosing between 0.5%, 1% and 2% is not a matter of taste. In our Monte Carlo test (20,000 reshuffles of the backtest trades, hypothetical), the 1-in-20 worst drawdown was about 10% at 1% risk and about 19% at 2% risk. At 5% risk it rose to about 41%.
And if the live edge were only half as strong as the backtest, those bad-case drawdowns grew to about 15% at 1% and 29% at 2%. Sizing is where you protect yourself from being wrong about your edge. The full numbers are in risk per trade and Monte Carlo.
Lot size for prop firm challenges
On a $100,000 challenge, 1% risk means around $1,000 per trade, or 0.43 lots with a $23 stop. Prop firms typically have a daily loss limit and a maximum loss limit, so your size must leave room for a losing streak without breaching either. Check your firm's current rules, because they differ and change.
For a hypothetical 2026 challenge simulation at 1% risk, see how to pass a prop firm challenge trading gold for the full walk-through.
Common lot size mistakes on gold
- Using a forex lot-size calculator set up for EURUSD. Gold's contract size is different.
- Ignoring account currency. If your account is not in USD, convert your risk amount into dollars first.
- Forgetting the spread. Your stop is triggered on the bid for a buy. Add the typical spread to your stop distance if you size close to your limit.
- Rounding up. 0.043 becomes 0.04, not 0.05. Rounding up means risking more than planned.
- Not checking the contract size. Open the symbol's specification in MT5 (right-click in Market Watch → Specification) and confirm the contract size is 100.
If you are new to gold, start with our beginner's guide to trading XAUUSD.
FAQ
How much is 0.01 lot in gold?
On most brokers, 0.01 lot of XAUUSD equals 1 ounce of gold. Each $1 move in the gold price changes your profit or loss by $1. A $23 stop at 0.01 lots therefore risks $23.
What lot size should I use for a $1,000 gold account?
Usually 0.01, which is the minimum on most brokers. Be aware that with typical structure-based stops, 0.01 lot can already risk more than 2% of a $1,000 account. If the stop is wide, it may be better to skip the trade.
What lot size for $100 risk on gold?
Divide $100 by the stop distance times 100. With a $23 stop, that is 0.043, so trade 0.04 lots. With a $50 stop, it is 0.02 lots.
Should I use a fixed lot size for gold?
A fixed lot size means your risk changes with every stop distance, which makes losses uneven. Fixed-percentage risk keeps each loss the same share of your account. Most systematic traders size each trade from its stop.
This article is educational and not financial advice. Trading gold and leveraged products carries a high risk of loss.
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