Gold lot size calculator (XAUUSD)

Type your risk and your stop, as a dollar move, in pips or in MT5 points, and get the lot size for gold. Pick your prop firm account to see whether the stop still fits today’s daily loss limit and the room to your max loss.

1Your account

Fills in the balance and the firm's limits for a fresh account

2Your trade

From your broker. MT5: Market Watch → right-click XAUUSD → Specification → Contract size. Usual: 100.

XAUUSD · $100 per $1.00 move per lot
Position1.00 lots
At risk$5001% of balance
Per $1.00 move$100at this size

Trade 1.00 lots to risk $500 at your stop.

FX conversions use the ECB reference rates of 2026-10-13. Sizes are rounded down, so the risk never goes over what you set. A stop doesn't guarantee your fill: in fast markets the loss can be larger.

Worked example

A $5.00 stop on gold costs $100 per $1.00 move for one lot. With $500 at risk: $500 ÷ (5 × $100) = 1 lot, losing $500 at the stop.

On a prop account the stop also has to fit the firm’s limits: what is left of today’s daily loss limit, the room to the max loss. Pick your firm above and the calculator sizes the trade inside all of them.

With your prop firm’s limits

The same calculator, opened on a firm’s accounts with their daily loss limit, max loss filled in.

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Questions

How much is one pip on gold?

With the usual contract of 100 ounces, a $1.00 move in gold is worth $100 per lot. Most platforms call $0.10 a pip ($10 per lot) and $0.01 a point ($1 per lot), so a $5.00 stop is 50 pips or 500 points.

How do I calculate lot size for XAUUSD?

Lot size = risk in dollars ÷ (stop in dollars × $100). With $500 at risk and a $5.00 stop: 500 ÷ (5 × 100) = 1.00 lot. If your broker’s gold contract is not 100 oz (check Symbol → Specification in MT5), change the contract size in the calculator.

What lot size should I use for gold on a prop firm account?

Size from the money you can lose, not from the balance: many prop traders risk 0.5–1% per trade. On gold the stop is often wide in dollars, so the same risk gives a small lot. Make sure the stop also fits what is left of today’s daily loss limit; the calculator checks it when you pick your firm.