Educational guide, updated 10 October 2026. When reviewing this week’s gold news and calendar, calculate exposure before imagining a trade outcome. Identical lot sizes can imply different hypothetical losses when stop distance or contract specifications change. Here is an auditable calculation.
Four inputs to establish
- Account equity: expressed in the currency used for the risk budget.
- Risk budget: an example percentage chosen for a simulation, not a universal prescription.
- Price distance: the absolute entry-to-stop difference in dollars per ounce.
- Contract details: ounces per lot, minimum size, lot increments and currency conversion from the broker.
CME Group describes the connection between a stop, acceptable exposure and position size. Its futures examples must not be treated as identical to a broker’s XAUUSD CFD lot. Use the specifications of the instrument on the actual account.
A formula with consistent units
For a USD-account simulation with USD-denominated exposure: risk budget = equity × risk percentage; price risk per lot = price distance × ounces per lot. Theoretical size is the budget divided by price risk per lot, before costs and execution effects.
Explicit units avoid confusion between pips, points and dollars. If the account uses another currency, convert the hypothetical loss into account currency at an appropriate rate before calculating lots.
A hypothetical example, not a position recommendation
| Input | Simulation value |
|---|---|
| Equity | US$1,000 |
| Example risk budget | 0.5% = US$5 |
| Entry-to-stop distance | US$5 per ounce |
| Example contract | 100 ounces per lot |
| Price risk per lot | 5 × 100 = US$500 |
| Theoretical size before costs | 5 ÷ 500 = 0.01 lot |
The 100-ounce contract is an illustrative assumption, not a rule for every broker. Different lot increments require reassessment. If the minimum permitted size exceeds the simulation budget, rounding up does not preserve that budget.
Include costs and execution limits
Account for commissions and the effect of spread using the entry and stop prices in the calculation. Avoid counting spread twice if it is already reflected in the effective distance. Slippage may cause actual loss to exceed the simulation; an ordinary stop does not guarantee the specified execution price.
Combine exposure across related gold positions. Available margin is also not a loss budget: the two measures answer different questions.
Before saving a simulation
- Verify contract size and account currency.
- Record stop distance and its rationale.
- Include costs without double counting.
- Check lot increments and minimum permitted size.
- Record combined exposure and slippage limitations.
Apply the arithmetic to the breakout–retest example in a practice account. Correct calculation does not demonstrate that a trade idea will be profitable.
Concept source
CME Group: Proper Position Size. The table is an editorial simulation with stated assumptions, not a quote or an instruction to trade.
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