A move of $1 in Gold is a change in the quoted price, not a $1 change in your account. The cash result depends on how many ounces your position represents. Before copying a lot size from a signal, calculator or EA preset, identify the exact broker symbol and its contract size.
Every number below is hypothetical. The examples use a linear XAUUSD contract quoted in US dollars per troy ounce, 100 ounces per lot and a USD account unless stated otherwise. These assumptions explain the arithmetic; they are not current prices, universal broker specifications or a suggested risk limit.
Read the contract before calculating
In desktop MT5, open Market Watch, right-click your Gold symbol and open Specification. Record contract size, tick size, tick value, minimum volume, volume step, profit currency and calculation mode. A suffix such as XAUUSD.a can identify a different contract or account offering; the letters XAUUSD alone do not establish its trading conditions.
For our 100-ounce example, exposure in ounces = lots × 100. This turns the order volume into a quantity you can use in the profit calculation.
| Volume | Gold exposure | Gross profit |
|---|---|---|
| 1.00 lot | 100 ounces | $250.00 |
| 0.10 lot | 10 ounces | $25.00 |
| 0.01 lot | 1 ounce | $2.50 |
Pip, point and tick are different labels
A platform point relates to the quoted decimal precision. A tick size is the smallest permitted price change. They can differ: a hypothetical three-decimal symbol can have a point of 0.001 but a tick size of 0.01. A $1.00 change would then equal 1,000 points or 100 ticks.
Do not assume that every Gold trader means the same distance by a pip. If a tutorial defines one pip as 0.10, a $1.00 move contains 10 such pips; if it defines one as 0.01, the same move contains 100. Write the actual price distance beside the pip count. For an EA input labelled points, use the product documentation and your symbol's point value rather than silently substituting a pip convention.
Calculate a buy or sell result from actual fills
For the assumed linear contract, buy gross profit = (closing price − opening price) × contract size × lots. For a sell, reverse the price subtraction: (opening price − closing price) × contract size × lots. A negative result is a loss.
A hypothetical 0.10-lot buy filled at 3,000.00 and closed at 3,002.50 produces (3,002.50 − 3,000.00) × 100 × 0.10 = $25 before separate charges. Closing that buy at 2,997.50 instead gives −$25. A 0.10-lot sell from 3,000.00 to 2,997.50 gives +$25.
Use executable prices: a buy typically opens at Ask and closes at Bid; a sell opens at Bid and closes at Ask. If you use both actual fills, their spread effect is already inside the price difference. Do not subtract the same spread again. Deduct separate commission and financing charges to reconcile the net result.
Work backward from a planned loss
Suppose an illustrative $10,000 sizing base and 2% risk budget give $200. A buy entry at 3,000.00 with a planned stop at 2,992.50 has a $7.50 price distance. Under our assumptions, one lot would lose $7.50 × 100 = $750 at that exact exit. Raw size = $200 ÷ $750 = 0.266666… lots.
If the broker permits 0.01-lot steps starting at 0.01, 0.26 lots gives $195 gross planned loss; 0.27 gives $202.50. Round down to a permitted volume when you want to keep this simplified estimate within the budget, then check costs. If even the minimum allowed volume exceeds the budget, forcing the minimum size does not solve the mismatch.
The $195 figure leaves only $5 for additional loss. An exit $0.20 worse than the planned stop adds $0.20 × 100 × 0.26 = $5.20 before commission. The result already exceeds $200. A stop-loss price is an instruction, not a guaranteed execution price; gaps or fast markets can produce larger differences.
Check tick value and account currency
For a linear instrument, another check is number of ticks × tick value per lot × lots. Using a hypothetical 0.01 tick size and $1 tick value for one lot, a $2.50 move is 250 ticks; at 0.10 lots that is 250 × $1 × 0.10 = $25. Confirm whether the reported tick value is per lot and which currency it uses.
On a non-USD account, a USD profit needs conversion. A hypothetical $25 profit converted at $1 = €0.90 becomes €22.50 before any additional charges; that conversion rate is only an example. MT5's OrderCalcProfit provides an estimate in account currency under the current trading conditions. Different calculation modes or profit/loss tick values can make a single fixed multiplier unsuitable.
Use the Quantora calculator within its limits
The linked Position Size Calculator uses the entered sizing base, risk percentage, absolute entry-to-stop distance and editable contract size. With 10,000, 2%, 3,000.00, 2,992.50 and 100, its raw calculation is the 0.266666… result above. Its lot display rounds to two decimal places, so 0.27 on screen is not broker-step validation or a guarantee that the rounded order stays within the budget.
The tool does not convert currencies, include trading charges, validate stop direction or calculate margin. For a protective stop, check that it is below a buy entry or above a sell entry. Use matching USD assumptions for this example, confirm allowed volume and risk in your platform, and separately review the account's margin before placing an order.
Common questions
- Does 0.01 lot always mean one ounce? Only if that contract contains 100 ounces per lot. A different contract size changes the answer.
- Does more leverage change profit on the same Gold volume? The price-distance result is unchanged; leverage and the contract's margin rules affect collateral requirements.
- Can I size an EA basket from one stop distance? Only if that distance and volume describe the whole exposure. Additional grid orders change the quantity and entry prices, so a single-position estimate does not cap basket risk.