Gold Lot Size Calculator
Find the correct XAUUSD position size for any trade. Enter your balance, the risk you're willing to take, and your stop-loss distance — the calculator does the rest for MT4 and MT5.
Sizing every trade by hand gets tedious. ForexGoldEA applies your risk-per-trade rule automatically on every position — with a fixed stop-loss and a max drawdown ceiling.
Get the EA free →How the gold lot size is calculated
Position sizing on gold comes down to one idea: decide how much money you're willing to lose before you decide how big to trade. The formula the calculator uses is:
Lot size = (Balance × Risk%) ÷ (Stop-loss in $ × 100)
One standard lot of XAU/USD is 100 ounces, so a $1 move in the gold price is worth $100 per lot — or $1 per 0.01 lot. If you're risking $5 and your stop-loss is $6 of price movement away, you can afford about 0.008 lots, which rounds down to the 0.01 minimum.
A quick example
On a $500 account risking 1% ($5), with a $6 stop-loss: $5 ÷ ($6 × 100) = 0.0083 lots → round down to 0.01 lots. That single trade then risks about $6 if the stop is hit — right around your 1% target.
Why round down, never up
Rounding up pushes your risk above the limit you set. Always round down to the nearest step your broker allows (usually 0.01). It's the difference between a disciplined system and one that quietly over-leverages.