Opened the Wrong Lot Size on Gold by Mistake? The 60-Second Fix in MT5

The short answer

If you opened a gold trade with the wrong lot size, fix it now, not later. Waiting to see whether the price goes your way turns a typing mistake into a real loss, or a lucky win that teaches the wrong habit.

The fix takes three steps:

1. Reduce the position to the size you meant. On most MT5 accounts (hedging) you close just the extra volume. On a netting account you place an opposite trade for the extra volume.
2. Check the stop-loss on what is left. Make sure the remaining position has the stop and take-profit you planned.
3. Write it down. Note the mistake and its cost in your journal, then step away for a few minutes before the next trade.

A filled market order cannot be “cancelled”. It is a real position and leaving it costs the spread, like any other close. Only a pending order that has not triggered yet can simply be deleted.

Why a lot-size slip is so costly on gold

On most platforms one standard lot of XAUUSD is 100 ounces. So:

• 0.01 lot = $1 per $1 move in gold
• 0.10 lot = $10 per $1 move
• 1.00 lot = $100 per $1 move

The most common slips are one decimal place out: 1.00 instead of 0.10, or 0.10 instead of 0.01. Each one makes the trade ten times bigger than planned. Our contract size guide explains where to check the contract size on your own symbol.

What the mistake costs at real gold ranges

To show the size of the problem with real numbers, we measured COMEX gold futures (GC=F) one-hour bars from 5 August to 4 November 2026 (1,484 hourly bars). The median hourly range was $14.7, and in one hour out of ten the range was $28.7 or more. The widest single hour was $115.8. The median move from an hour’s open to its close was $6.5.

Here is what those moves mean for a trade planned at 0.10 lot when it was opened at a different size by mistake:

On a $2,000 account, a typical hour’s move against a 1.00-lot mistake is about a third of the balance. A busy hour can be more than the whole account. That is why the first minute matters: you are not trying to predict the next move, you are trying to get back to the risk you chose.

The position size calculator shows what lot size fits your stop and account, and our guide to lot sizes for small accounts has the same maths for $100, $500 and $1,000 balances.

Step 1: know your account type (hedging or netting)

MT5 accounts use one of two ways of recording positions, and the fix depends on which one you have:

• Hedging: each trade is its own position. A buy and a sell on the same symbol can be open at the same time. Most retail XAUUSD accounts use this mode.
• Netting: there is only one position per symbol. A new trade in the opposite direction reduces it, closes it or reverses it.

You can usually see the mode in the account line of the Navigator window or in the welcome email from the account provider. If you open a buy and then a sell of the same size and see two lines in the Trade tab, the account is hedging. Do that test on a demo account, not with real money.

Step 2: reduce the trade on MT5 desktop

On a hedging account (partial close):

1. In the Toolbox at the bottom, open the Trade tab.
2. Double-click the gold position. The position window opens.
3. In the Volume field, type the extra amount only. If you opened 1.00 and meant 0.10, type 0.90.
4. Click the Close button. MT5 closes 0.90 lot at the current price and leaves 0.10 lot open.
5. Look at the Trade tab and check the remaining volume reads 0.10.

The volume must match the symbol’s volume step (often 0.01 for gold). If MT5 refuses the order with “invalid volume”, check the step in the symbol’s Specification window; our guide to MT5 gold errors explains that message.

On a netting account (opposite trade):

1. Open a new order on the same symbol.
2. Choose the opposite direction (Sell if you bought too much, Buy if you sold too much).
3. Set the volume to the extra amount (0.90 in the example).
4. Send it. The single gold position shrinks to 0.10 lot.

Be careful with the volume here. On a netting account, an opposite trade larger than your position reverses it: selling 1.10 against a 1.00 buy leaves you short 0.10.

Step 3: reduce the trade on the MT5 phone app

On Android and iPhone the steps are similar:

1. Open the Trade tab.
2. Long-press the position and choose Close position.
3. Change the volume to the extra amount before you tap the close button. MetaQuotes’ Android help says a position can be closed “in full or in part, depending on the volume of the opposite operation”.
4. Tap the button at the bottom to close that part.
5. Check that the remaining volume is what you planned.

If the account uses Request Execution, the app asks the provider for a price first. If you get a requote in a fast market, see requotes and off quotes explained.

Optional: Close By on hedging accounts

If you accidentally opened a second trade in the opposite direction, or you already hedged the mistake with an opposite trade, MT5’s Close By can close the two against each other. MetaQuotes’ help says it works only in hedging mode. The smaller position closes completely, and the larger one stays open with the difference in volume, keeping its original direction and open price. Because the second position closes at the first one’s open price, you avoid paying the spread twice.

Close By is a tidy-up tool, not a reason to hedge mistakes. Holding a buy and a sell together locks in the current loss, still costs swap on both sides overnight, and makes the account harder to read.

Step 4: fix the stop-loss and take-profit

After you reduce the trade, check the stop-loss and take-profit on the remaining position. On a hedging account, the remaining part usually keeps the same levels. On a netting account, the levels belong to the single position, so check they are still where you want them.

Then check the risk once more: stop distance in dollars × ounces = money at risk. With 0.10 lot (10 oz) and a $12 stop, that is $120. If that is more than you planned, the size was not the only mistake. Our guide on setting stop-loss and take-profit on MT5 mobile has the screens.

What if the wrong-size trade is already in profit?

Fix it anyway. A lucky win on an oversized trade is still a mistake: next time the same slip could land in a busy hour that moves against you. Many traders close the extra volume as soon as they notice, take whatever profit or loss it has, and then manage only the planned size. Write down the result as “error trade” in your journal so it does not distort your strategy statistics.

What if it is already a big loss?

This is where most damage happens, because the urge is to keep the trade open “until it comes back”. Three rules help:

• Reduce to the planned size now. A loss you can see is easier to recover from than one that keeps growing.
• Do not add a new trade to win it back. That is revenge trading, and it often makes a bad day worse.
• Stop for the session if you are shaken. Our trading psychology hub has a tilt check you can run in a minute.

How to stop it happening again

A simple habit catches most slips: say the lot size and the dollar risk out loud before you press Buy or Sell. “Zero point one lot, twelve-dollar stop, one hundred twenty dollars at risk.” If the words sound wrong, they usually are.

Practise the fix before you need it

Open a demo account, place a deliberately oversized gold trade and practise cutting it back on both desktop and phone. Do it three times. When a real slip happens, your hands will already know the steps. Our 30-day demo practice plan has room for this drill in week one.

Sources

• MetaTrader 5 Android help: opening and closing positions (MetaQuotes)
• MetaTrader 5 Android help: Close By (MetaQuotes; hedging mode only, remaining volume and spread saving)
• XAUUSD Global analysis of COMEX gold futures (GC=F) one-hour bars via Yahoo Finance, 5 August to 4 November 2026 (1,484 bars; median range $14.7, 90th percentile $28.7, widest $115.8, median open-to-close move $6.5)

Educational content only, not financial advice. Trading gold with leverage carries a high risk of loss.

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