Gold lot size calculator.
Enter your balance, how much you're willing to risk and your stop loss. It works out the lot size so a losing trade costs only what you planned.
Estimates for learning. Contract sizes, pip definitions and limits vary by provider, so always check your own platform before you trade.
Use it in the free TopTrades FX app
Save your size straight into the free TopTrades FX journal. The journal and core tools are free.
The maths behind your lot size
On most platforms 1 standard lot of XAU/USD is 100 ounces. That means:
- 1.00 lot gains or loses $100 for every $1.00 gold moves ($1 for every $0.01)
- 0.10 lot = $10 per $1.00 move
- 0.01 lot = $1 per $1.00 move
So: lot size = money at risk ÷ (stop distance in $ × 100).
Example: $1,000 account, 1% risk = $10. Stop is $3.00 away. $10 ÷ ($3 × 100) = 0.033, which rounds down to 0.03 lots. If the stop is hit you lose $9 (0.9%). The calculator always rounds down, so you never risk more than you planned.
Many traders count gold in pips where 1 pip = $0.10. A $3.00 stop is then 30 pips, and 1 lot is worth $10 per pip.
Questions
What is 1 lot of gold?
Usually 100 troy ounces. Some providers use different contract sizes, so check the contract specification on your platform.
How much should I risk per trade?
Many traders keep risk to around 1% of the account per trade or less, so a losing streak doesn't wipe them out. This is education, not advice.
Why is my result 0.00 lots?
Your stop is too wide for the amount you want to risk. Even 0.01 lot would lose more than your limit. Use a tighter stop, or skip the trade.
Does it work in pounds?
Yes. Choose British pounds and type today's GBP/USD rate. Gold is priced in dollars, so the calculator converts.
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