Skip to content

XAUUSD Lot Size Calculator

Turn your chosen risk budget and gold stop distance into a broker-configurable position size.

Educational estimates, not personalized investment advice. Verify broker specifications. Costs, slippage and changing exchange rates can increase actual loss. Example inputs are not live quotes.

Optional indicative USD/oz price from Gold API. Review your stop-loss after applying.

Your estimate

See the numbers behind your plan.

Review the example inputs, adjust them to your scenario, then select Calculate.

  1. Check instrument specifications
  2. Enter your parameters
  3. Review the result and assumptions
Calculated in your browser. No account required.

How this calculator works

This calculator converts a chosen monetary risk budget into an XAUUSD position size. It connects three quantities: the amount you plan to risk, the distance between entry and stop, and the number of ounces represented by one lot. The output is a planning estimate based on your inputs, not a recommendation to enter a trade.

A quick visual example

Illustrative inputs · not live prices
  1. Choose a budget$10,000 × 1% = $100
  2. Value the stop$10/oz × 100 oz = $1,000 per lot
  3. Size the position$100 ÷ $1,000 = 0.10 lot

Replaces the form inputs with this example and calculates the result.

Choose the right inputs

Enter your account balance and either a percentage or fixed risk amount. Select long or short and enter an entry price and a stop on the correct side. Copy the contract size, minimum lot, maximum lot and lot step from your broker’s symbol specification. For a non-USD account, supply the number of account-currency units per USD.

Understand your result

Raw size is the mathematical answer before broker restrictions. Valid size is rounded down to the allowed lot step so the modelled stop loss does not exceed the budget. If raw size is below the minimum, zero means that no permitted size fits this budget; it does not mean trading is risk-free. Notional exposure is the market value of the position, not the money required as margin.

Common mistakes to avoid

Do not assume every gold symbol uses 100 ounces per lot. A smaller stop increases calculated size, but does not make the trade safer. Spreads, commissions, price gaps and slippage can make the realised loss larger than the estimate.

Frequently asked questions

Why is my result smaller than the raw size?

Broker lot steps require discrete sizes. For example, 0.099 rounds down to 0.09 when the step is 0.01. Rounding up would exceed the selected budget in this model.

Does the current-price button set my stop?

No. It replaces the entry estimate only. Review the stop and calculate again. Indicative spot prices can differ from executable broker prices.

Sources and further reading

CME Group: contract size, ticks and profit/loss explains contract-based price exposure using futures examples; those contract specifications are not substitutes for a Forex or CFD broker’s settings.

CFTC: retail Forex customer advisory explains leverage and dealer risks in a US regulatory context. Neither source endorses Curizora or validates a particular broker or prop-firm rule set.

Calculation formula

Risk budget = balance × risk% ÷ 100. Risk per lot = |entry − stop| × ounces per lot × USD-to-account rate. Lots = risk budget ÷ risk per lot; round down to lot step.

Worked example

A $10,000 account at 1% risk has a $100 budget. With a $10/oz stop and 100 oz per lot, risk per lot is $1,000: size is 0.10 lot.

Assumptions and limitations

Contract size is an editable example, not a universal broker setting. Verify min/max lot and lot step. Conversion source is USD. Excludes costs and slippage; a stop is not a guaranteed execution price.

Read our calculation methodology · Explore trading guides

Related calculators