Gold Lot Size Calculator (XAUUSD)
Calculate the correct XAUUSD lot size from your account balance, risk percentage and stop-loss distance. Contract size is adjustable — 100 oz is the standard preset, not a universal rule.
Why a gold-specific calculator? A generic forex lot-size calculator assumes 100,000-unit currency lots. Gold (XAUUSD) trades in ounces per lot — most brokers use 100 oz, but 10 oz and 1 oz contracts exist. Using forex math on gold gives the wrong lot size. Trading currency pairs? Use the forex version →
How the calculation works
Risk Amount = Balance × (Risk % ÷ 100)
SL Distance = | Entry Price − Stop-Loss Price |
Loss per 1.0 lot = SL Distance × Contract Size
Raw lots = Risk Amount ÷ Loss per 1.0 lot
Final lots = round down(Raw lots ÷ Lot Step) × Lot Step
Estimated risk = Final lots × SL Distance × Contract Size
Assumptions & limitations
- 100 oz is a preset, not a rule. Most brokers quote XAUUSD at 100 oz per 1.0 lot, but 10 oz and 1 oz contracts exist. Check your broker's contract specification and adjust above.
- Spread, commission, swap and slippage are not included — your real loss can be slightly larger than the estimate.
- No live price feed. Enter the price manually; the math does not need live data.
- Results are educational only — not financial advice. Gold is volatile; never risk money you cannot afford to lose.
Frequently Asked Questions
What is 0.01 lot size in gold?
On a standard 100 oz contract, 0.01 lot = 1 ounce of gold. That means every $1 move in XAUUSD changes your P/L by $1. On a 10 oz contract, 0.01 lot = 0.1 oz ($0.10 per $1 move).
How much is 1 pip on XAUUSD?
It depends on convention: most traders call $0.10 one "pip" ($1 = 10 pips), while some platforms count $0.01 as a pip (a "point"). Use the pip-convention toggle above to match your broker. At 100 oz, one $0.10 pip = $10 per 1.0 lot.
What lot size should I use with a $1,000 account risking 1% and a $5 stop-loss?
Risk amount = $1,000 × 1% = $10. Loss per 1.0 lot = $5 × 100 oz = $500. Lots = $10 ÷ $500 = 0.02. Try it in the calculator above.
Is 1 lot of gold always 100 ounces?
No. 100 oz is the most common standard, but brokers also offer 10 oz (mini) and 1 oz (micro) XAUUSD contracts. Always confirm the contract size in your broker's specification — that is why this calculator lets you change it.
Should I round my gold lot size up or down?
Always down. Rounding up means risking more than your planned percentage. This calculator rounds down to your broker's lot step automatically.