Gold Margin Calculator – XAU/USD Required Margin & Lot Size
Trading gold without knowing your margin requirement is one of the most common mistakes new traders make. You open a position, the market moves against you, and suddenly your broker closes the trade — not because you were wrong, but because you ran out of margin.
This free XAUUSD margin calculator tells you exactly how much capital your broker will lock up before you enter a gold trade. Enter your lot size, leverage, and the current gold price — and you’ll get your required margin and full position value in seconds.
How to use this calculator
Fill in four fields: your account currency (USD), the current gold price, your leverage ratio, and your trade size in lots. Hit Calculate Margin and the tool instantly shows your required margin and total position value. No signup, no ads, completely free.
XAUUSD margin formula
The margin formula for gold is straightforward. One standard lot of XAUUSD represents 100 troy ounces of gold. Here is the exact formula brokers use:
Required Margin = (Lots × 100 oz × Gold Price) ÷ Leverage Position Value = Lots × 100 oz × Gold Price
Example calculation
Let’s say gold is trading at $3,000 per oz, you want to trade 0.1 lots, and your broker gives you 1:100 leverage. Here is what happens step by step:
Step 1 — Position value:
0.1 lots × 100 oz × $3,000 = $30,000
Step 2 — Required margin:
$30,000 ÷ 100 (leverage) = $300.00
Result: To open a 0.1 lot gold trade at $3,000 with 1:100 leverage, your broker will lock up $300 as margin.
This matches the result from tools like the Myfxbook margin calculator — the formula is universal across all forex brokers.
What is margin in gold trading?
Margin is not a fee. It is a deposit your broker temporarily holds while your trade is open — think of it like a security deposit. Once you close the trade, the margin is released back into your free balance.
The higher your leverage, the smaller the margin required. At 1:100 leverage, you only need 1% of the full trade value as margin. At 1:10 leverage, you need 10%. Always make sure you have enough free margin to absorb losses without hitting a margin call.
Frequently asked questions
How much margin do I need to trade 1 lot of gold?
At a gold price of $3,000 and 1:100 leverage, trading 1 standard lot requires a margin of $3,000. At 1:200 leverage that drops to $1,500. Use the calculator above to check any combination instantly.
What is the contract size for XAUUSD?
One standard lot of XAUUSD equals 100 troy ounces of gold. A mini lot (0.1) equals 10 oz, and a micro lot (0.01) equals 1 oz. This is the standard contract size used by most forex and CFD brokers worldwide.
Does leverage affect my profit and loss on gold?
No. Leverage only affects how much margin you need to open a trade. Your actual profit and loss is always calculated on the full position value — not on the margin. Higher leverage means less capital locked up, but the same risk exposure.
What happens if my margin runs out?
If your account equity falls below your broker’s margin level requirement (usually 50–100%), you will receive a margin call. If it drops further to the stop-out level, your broker will automatically close your open positions to prevent a negative balance.
What is a good leverage for trading gold?
Most professional gold traders use between 1:10 and 1:50 leverage to keep risk manageable. Gold can move $20–$50 in a single session, so very high leverage like 1:500 can wipe out an account quickly on small moves. Lower leverage means more margin required but significantly more breathing room.