BullionEdge Pro — Lot size calculator
XAU/USD lot size calculator
Enter your balance, the percentage you are willing to lose, and where the stop goes. The lot size falls out of the arithmetic. No account, no email, and it keeps working offline once loaded.
- Risk budget
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- Actual risk
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- Stop distance
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- Stop price
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- 1R (break-even)
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- Target
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buildPlan() in BullionEdge Pro's sizing engine, inlined into this page rather
than reimplemented for it. If the calculator and the desk ever disagreed, the calculator
would be the liability — so they are not allowed to.
The rule: size is an output, never an input
Most gold accounts do not fail from bad analysis. They fail because a lot size was chosen because it felt about right, a stop was placed wherever the chart suggested, and the two numbers were never reconciled. Fixed-fractional sizing reconciles them by turning the question around: you nominate the money, and the stop distance decides the size.
risk budget = balance × risk %
lots = risk budget ÷ (stop distance in price × $100 per lot)
That $100 is the value of a 1.00 move in XAU/USD for one standard lot — gold's
hundred-ounce contract. A 150-pip stop, at gold's 0.10 pip, is a 15.00 price move, so one
standard lot puts $1,500 at risk. Against a $50 budget that is 0.03 lots, and no amount of
conviction about the setup changes the number.
Two things this gets right that free calculators often do not
1. It rounds down, never up
Lots trade in 0.01 steps, so the exact figure almost never lands on one. Round 0.037 up to 0.04 and you have quietly exceeded the maximum you just set — by roughly 8% on that trade, and by more as stops get tighter. This calculator truncates to 0.03, and shows the consequence honestly as actual risk beside your budget. It is always at or below the budget, never above it.
2. It says something useful when the trade cannot be placed
If your balance and stop produce less than 0.01 lots, there is no trade — the broker cannot fill it. A calculator that prints "0.00" and stops there has told you nothing. This one names the three things that actually change the outcome: tighten the stop, raise the risk percentage deliberately, or grow the account. Try a $200 balance against a 300-pip stop at 1% and you will see it.
What a risk percentage costs you
| Risk per trade | Consecutive losses to halve the account | Typically suits |
|---|---|---|
| 0.5% | about 138 | Small accounts, or a strategy that is not yet proven |
| 1% | about 69 | The common default among discretionary traders |
| 2% | about 34 | A documented edge, and the stomach to sit through it |
| 5% | about 13 | Very few people. Thirteen losses in a row is not rare. |
Those are compounding figures, not opinions: each loss shrinks the balance the next percentage is taken from, which is why an account decays rather than falling in a straight line. None of it is a recommendation for your situation — it is arithmetic to weigh against your own tolerance and your own record.
Sizing is one input to the decision, not the decision
Getting the lot size right prevents one specific kind of damage. It says nothing about whether the trade was worth taking, and a perfectly sized entry into a setup you would have rejected on a calmer day is still a bad trade. That is what a pre-trade checklist is for — and the session you place it in matters too, which is the best time to trade gold.
BullionEdge Pro puts the three together: sizing, a scored read of the setup taken from the chart rather than asked of you, and a journal that records what you actually did rather than what you meant to do.