Gold lot size calculator (XAUUSD)

The gold lot size is the money you accept to lose divided by what 1.00 lot of gold loses at your stop. At the usual 100 oz per lot, each $1.00 of price movement is worth $100 per lot, so a $7.50 stop costs $750 per lot, and risking $50 gives 0.06 lot after rounding down.

Gold is where most lot-size mistakes happen, because brokers, courses and calculators disagree on what a “pip” is. This calculator works from the dollar distance to your stop and tells you which convention it is using.

How it works

1. Money at risk. A share of your balance (1% of $5,000 is $50) or a fixed amount.
2. Loss per lot. The stop distance in dollars of the gold price, times the contract size (100 oz unless your broker says otherwise), converted into your account currency if it is not USD. Commission and spread are added if you enter them under Advanced.
3. Lots. Money at risk divided by the loss per lot, rounded down to the volume step and kept between the minimum and maximum volume.

The stop can be entered as a distance in pips, with the pip convention you choose, or as entry and stop prices. The calculator reads the stop back both ways, for example “750 pips at $0.01” and “75 pips at $0.10” for the same $7.50 distance, so you can match it to what your platform shows.

The formula

money at risk = balance × risk %
loss per lot  = |entry − stop| × contract size (oz) × USD → account rate + commission per lot
lots          = money at risk ÷ loss per lot, rounded down to the volume step

No gold price is needed for sizing on a USD account: only the distance to the stop matters. On another account currency only the USD rate is needed, which the calculator fills in from the ECB reference rates (dated, and editable).

$0.01 or $0.10: the gold pip problem

MT5 usually quotes XAUUSD to two decimals, so its smallest step, the point, is $0.01. Many brokers call that a pip; others, and many trading courses, call $0.10 a pip. A “75-pip stop” can therefore mean $0.75 or $7.50, a tenfold difference in risk.

The switch in the calculator changes the pip count, never the lot size: the dollar distance is what counts. If you are unsure which convention your broker uses, enter the entry and stop prices instead. See the pip value calculator for the value of a move at any lot size.

Worked examples

All examples use made-up prices and show the loss at the stop, before spread, commission and slippage.

Common mistakes

• Mixing pip conventions. Copying “a 50-pip stop” from a course that uses $0.10 pips into a platform that uses $0.01 cuts the real stop to a tenth. Enter prices when in doubt.
• Assuming 100 oz. Some brokers and all cent accounts differ. Contract size is in the MT5 Specification window.
• Rounding up to the minimum lot. If 0.01 lot loses more than your risk at a stop that makes sense, the trade does not fit the account. Raising the risk to make it fit defeats the point of sizing.
• Ignoring the spread. Gold spreads widen around news and the daily rollover. A spread entered under Advanced counts against the stop.
• Treating the stop as a guarantee. Gold can gap over a weekend or jump on a release, and a stop then fills at the next available price. The drawdown calculator shows what a run of full stops does to an account.

How PipWarden handles this

PipWarden sizes every order from your risk limit with the broker’s own tick value and volume step for the symbol, read from MT5, instead of textbook contract values. It rounds down, and when even the minimum lot would risk more than your limit it skips the trade and logs “Risk below minimum lot” rather than raising the risk.

Those checks happen before an order is placed. Open trades run to their stops, and gaps or slippage can make a loss larger than planned. See how it works, the features and the risk disclosure.