Gold Position Size Calculator
Calculate the exact XAU/USD lot size so a stop-loss hit loses only your chosen risk amount.
How it works
The position size calculator runs your account currency, risk amount and stop distance through a fixed formula. It returns the lot size in standard lots, where 1.00 lot equals 100 oz of gold and one pip is 0.01.
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What This Calculator Answers and When an Australian Trader Needs It
This calculator answers how many lots of gold you can trade if you want to lose exactly A$200 when your stop is hit. Australian traders use it before placing a market order, especially on volatile gold sessions when a 20-pip stop is common.
It removes guesswork from risk management. Instead of picking a lot size by feel, you match every trade to a pre-set dollar risk. That keeps a losing streak from blowing up your account, which matters when you trade with an offshore broker like FxPro.
Use it whenever your stop distance changes or you adjust your risk budget. It is quicker than manual maths and reduces the chance of a fat-finger error on MT4 or cTrader.
The Formula in Plain Words
The formula is: lot size = risk amount in account currency ÷ (stop distance in pips × pip value per lot). The pip value per lot is fixed for XAU/USD: one pip (0.01) on 1.00 lot (100 oz) equals 1.00 in the quote currency, which is USD.
You need three inputs: your account currency (AUD for most Australians), the amount you are willing to lose in that currency, and your stop distance in pips. The calculator converts the USD pip value to AUD using the current AUD/USD rate.
The result is the lot size, typically expressed to two decimal places. For gold, a 0.10 lot is 10 oz, and a 0.01 lot is 1 oz. The formula works for any stop distance or risk amount.
Worked Example on Gold
Suppose you have an AUD account and want to risk A$100 on a gold trade with a 25-pip stop. The reference XAU/USD price is 4275.0, and the AUD/USD rate is 0.6500.
First, convert A$100 to USD: 100 × 0.6500 = $65.00. The pip value for 1.00 lot is $1 per pip, so for a 25-pip stop the loss per lot would be $25. Divide $65.00 by $25 to get 2.60 lots.
So you would trade 2.60 lots of XAU/USD. If your stop is hit, you lose 25 pips × $1 per pip × 2.60 lots = $65, which equals your A$100 risk. This example uses the given contract size and pip definition, with no spread or commission added.
Common Mistakes and How to Read the Result Correctly
A frequent mistake is entering the stop distance in dollars instead of pips. If your stop is $2.50 away and each pip is $0.01, that is 250 pips — a huge distance. Always convert price distance to pips first.
Another error is forgetting to convert your risk amount to USD if the calculator expects USD. Australian traders with AUD accounts must use the current AUD/USD rate, otherwise the lot size will be wrong.
Read the result as the maximum lot size for that risk. Round down, not up, to stay within your risk budget. Also remember that the calculation ignores spreads and slippage, so actual losses may be slightly larger.
Common questions
How do I calculate gold position size with a 20-pip stop and A$50 risk?
Convert A$50 to USD using the current AUD/USD rate. For example, at 0.6500, that is $32.50. Each lot loses $1 per pip, so a 20-pip stop loses $20 per lot. Divide $32.50 by $20 to get 1.625 lots. Round down to 1.62 lots to stay within risk.
Why does my broker show a different margin for the same lot size?
Margin depends on leverage and the current gold price. The position size calculator ignores margin; it only sizes your trade to a dollar risk. Check the margin calculator separately to ensure you have enough free margin for the lot size.
Can I use this calculator for a USD account?
Yes. If your account is in USD, skip the currency conversion and enter your risk amount directly in USD. The formula becomes lot size = USD risk ÷ (stop distance in pips × $1 per pip per lot).
What is the minimum lot size for gold on FxPro?
FxPro allows micro lots on gold, typically 0.01 lots (1 oz). The position size calculator can return a number below 0.01 if your risk is very small or your stop is very wide. In that case, you cannot trade with that risk and stop combination.
Does the position size calculator include the spread?
No, it uses only your stop distance from entry. The spread is an additional cost that occurs when you enter and exit. To be conservative, add the spread to your stop distance or reduce your risk amount slightly.
Trade XAU/USD on FxPro
FxPro offers competitive gold spreads and the full suite of MT4, MT5, cTrader, and its own app. Australian traders can fund via PayID or bank transfer and start with a low entry.
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