XAUUSD Contract Size & Lot Size Calculator: 1 Lot = 100 oz?
XAUUSD is gold priced in U.S. dollars. The first lot-size question is usually whether 1 lot of XAUUSD means 100 ounces. On many MT4 and MT5 CFD feeds, the answer is yes: a standard XAUUSD CFD lot is commonly based on 100 troy ounces of gold. That difference from EURUSD, GBPUSD, or USDJPY is why gold can feel oversized when a trader copies the same lot size used on currency pairs.
Direct answer: Common broker specification: 1.00 XAUUSD lot = 100 troy ounces. If your broker uses that 100-ounce contract size, a 1.00 lot gold trade gains or loses about $100 for every $1.00 move in the gold price. A 0.10 lot trade gains or loses about $10 per $1.00 move, and a 0.01 lot trade gains or loses about $1 per $1.00 move.
Broker specs can vary. Check contract size, tick size, tick value, minimum lot, lot step, margin rate, and swap in your platform before using any XAUUSD lot size calculator.
Table of Contents
XAUUSD Contract Size: 1 Lot and 100 oz
A lot is the trade volume you choose in the order ticket. For XAUUSD, that volume controls how many ounces of gold your position represents. The most common retail gold CFD convention is:
Use this as a common retail CFD convention, not a universal rule. If your platform shows a different contract size, tick size, tick value, or volume step, use the broker specification instead of the example table.
| Gold volume | Common ounce exposure | Profit/loss per $1.00 move | Common name |
|---|---|---|---|
| 1.00 lot | 100 troy ounces | $100 | Standard lot |
| 0.10 lot | 10 troy ounces | $10 | Mini lot |
| 0.01 lot | 1 troy ounce | $1 | Micro lot |
| 0.001 lot | 0.1 troy ounce | $0.10 | Nano or broker-specific step |
This is exposure math, not a guarantee that every broker uses the exact same symbol design. Some platforms list gold as XAUUSD, GOLD, XAUUSDm, XAUUSD.pro, or another suffix. Some brokers support 0.01 lots only, while others allow 0.001 lots. Some accounts use unit-based sizing instead of MT4/MT5-style lots. The safest habit is to treat the calculator as the workflow and the broker specification as the final truth.
XAUUSD Pip Value and Ounce Exposure
Most retail platforms quote XAUUSD with two decimal places, such as 2350.25. In that convention, the Forex Vitals calculator treats 0.01 as one pip. With a common 100-ounce standard lot, one pip is:
| Position | One pip if pip = 0.01 | 100 pips / $1.00 price move | Use case |
|---|---|---|---|
| 1.00 lot | $1.00 | $100 | Large account or very tight risk plan |
| 0.50 lot | $0.50 | $50 | Intermediate exposure |
| 0.10 lot | $0.10 | $10 | Smaller account or wider stop |
| 0.01 lot | $0.01 | $1 | Minimum sizing on many MT4/MT5 accounts |
The language gets messy because some traders call a $0.10 move a pip and a $0.01 move a point, while other calculators use 0.01 as the pip. This is why exact examples should state both the price distance and the pip convention. If your stop is from 2350.00 to 2345.00, the gold price distance is $5.00. Under the 0.01-pip convention, that is 500 pips. The cash risk is the same either way: a 1.00 lot position risks about $500 before spread and slippage.
Gold Lot Size Formula
The cleanest XAUUSD lot size formula starts with the amount you are willing to lose. The trade idea decides the stop loss; your risk plan decides the money at risk; the formula converts those two inputs into lots.
The same formula can be expressed in pip terms:
Both formulas lead to the same result when the pip value is set correctly. The price-distance version is often easier for gold because traders naturally think in dollars: "My entry is 2350.00 and my stop is 2344.50." The pip version is useful when a platform or calculator asks for stop loss in pips.
Step-by-step XAUUSD sizing workflow
- Choose the invalidation level first. Do not pick a lot size first and then hunt for a stop that makes it affordable.
- Calculate risk amount. A $10,000 account risking 1% has a $100 risk budget.
- Measure the stop distance. Entry 2350.00 with stop 2345.00 means $5.00 of gold movement.
- Calculate risk per 1.00 lot. $5.00 x 100 ounces = $500 risk per standard lot.
- Divide risk amount by risk per lot. $100 / $500 = 0.20 lots.
- Round to your broker's lot step. If the platform allows 0.01 increments, 0.20 lots is valid. If it allows 0.10 only, you may need to reduce or skip the trade.
- Check margin and spread. A mathematically correct risk size can still be too large for the account's available margin or too sensitive to slippage.
Worked XAUUSD Lot Size Examples
Example 1: $5,000 account, 1% risk, wider gold stop
| Input | Value | Calculation |
|---|---|---|
| Account equity | $5,000 | Used as the risk base |
| Risk percentage | 1% | $5,000 x 0.01 = $50 risk amount |
| Entry and stop | 2335.00 entry / 2328.50 stop | $6.50 stop distance |
| Risk per 1.00 lot | $650 | $6.50 x 100 ounces |
| Raw lot size | 0.0769 lots | $50 / $650 |
If the broker supports 0.01 lot steps, the conservative rounded size is 0.07 lots. That risks about $45.50 before spread and slippage. Rounding up to 0.08 lots risks about $52.00, which exceeds the planned 1% risk. This is the quiet detail that separates risk control from wishful sizing.
Example 2: $10,000 account, 0.5% risk, tighter gold stop
| Input | Value | Calculation |
|---|---|---|
| Account equity | $10,000 | Used as the risk base |
| Risk percentage | 0.5% | $10,000 x 0.005 = $50 risk amount |
| Entry and stop | 2400.00 entry / 2396.25 stop | $3.75 stop distance |
| Risk per 1.00 lot | $375 | $3.75 x 100 ounces |
| Raw lot size | 0.1333 lots | $50 / $375 |
With a 0.01 lot step, 0.13 lots risks about $48.75. With a 0.001 lot step, 0.133 lots risks about $49.88. Smaller volume steps let the trade match the risk plan more precisely, which matters for prop firm accounts and accounts with strict daily loss limits.
Example 3: Reverse-calculating the maximum stop for 0.01 lots
Sometimes a small account can only trade the minimum XAUUSD volume. Suppose the account is $500, the risk limit is 1%, and the broker's minimum gold volume is 0.01 lots.
In that scenario, a stop wider than $5.00 risks more than 1% at the minimum position size. The correct decision is not to force a 0.01 lot entry with a bad stop. The correct decision is to wait for a setup with a valid stop inside the risk budget, use a broker with smaller volume steps, or skip the trade.
Margin and Leverage: Different From Stop-Loss Risk
Lot size controls both risk and notional exposure, but stop-loss risk and margin are not the same thing. Stop-loss risk asks, "How much will I lose if the stop is hit?" Margin asks, "How much account equity must be set aside to hold the position?"
Example: if XAUUSD trades at 2350.00 and you open 0.10 lots, you control about 10 ounces of gold. The notional value is 2350.00 x 10 = $23,500. At 20:1 leverage, simplified required margin is $1,175. At 100:1 leverage, simplified required margin is $235.
Broker Specification Checklist for XAUUSD
Before trusting a gold lot size calculator, open your platform's symbol specification. On many MT4/MT5 platforms, this means right-clicking the symbol in Market Watch and choosing "Specification." The exact wording can vary by platform, but the fields to inspect are similar.
| Specification field | What to check | Why it matters |
|---|---|---|
| Contract size | Commonly 100 for XAUUSD, but verify | This drives ounce exposure and dollar risk per price move. |
| Digits / tick size | Often two decimals and 0.01 tick size | This determines whether the calculator's pip input matches your platform. |
| Tick value | Cash value of one minimum tick | Useful for accounts not denominated in USD or symbols with custom specs. |
| Minimum volume | Often 0.01, sometimes smaller or larger | If calculated size is below minimum volume, the trade may be too large for the account. |
| Volume step | 0.01, 0.001, or broker-specific | This controls how precisely you can match the target risk. |
| Margin rate | Leverage or symbol-specific margin requirement | Gold often has a different margin schedule than major currency pairs. |
| Swap and rollover | Long swap, short swap, and triple-swap day | Holding gold overnight can add costs not shown in a simple stop-loss calculation. |
| Stops level | Minimum stop distance from current price | Very tight stops may be rejected or forced farther away. |
Common XAUUSD Lot Size Mistakes
Mistake 1: Treating gold like EURUSD
A trader comfortable with 0.50 lots on EURUSD may think 0.50 lots on gold is similar. It is not. If the broker uses a 100-ounce XAUUSD contract, 0.50 lots controls 50 ounces of gold. A $10 move against that position is roughly $500 before transaction costs. The same number in the volume box can carry a very different risk profile.
Mistake 2: Confusing margin with risk
Low margin requirements can make a large gold position look affordable. Affordability is not the same as survivability. The market does not care that the position required only a few hundred dollars of margin if the stop distance implies a $700 loss on a $5,000 account.
Mistake 3: Ignoring spread and slippage
XAUUSD spreads often widen around rollover, major news, and thin liquidity windows. If the exact formula gives 0.08 lots but the setup requires a very tight stop, spread and slippage can push the real loss above the planned risk. For high-volatility gold trades, rounding down is often cleaner than trying to maximize every decimal.
Mistake 4: Using balance when equity is lower
If you have open floating losses, account balance can overstate usable risk capacity. Equity is usually the better risk base because it reflects current open-position drawdown. This is especially important when adding gold exposure to existing USD-sensitive trades.
Mistake 5: Forgetting correlation and event risk
Gold can respond to U.S. yields, the U.S. dollar, real-rate expectations, risk sentiment, and geopolitical stress. If you already hold USD pairs, indices, or other metals, an XAUUSD trade may add concentrated macro exposure rather than true diversification. Check correlation, session liquidity, and scheduled news before treating a gold trade as independent.
XAUUSD Lot Size FAQ
What is the XAUUSD contract size for one lot?
In many MT4 and MT5 gold CFD feeds, the common XAUUSD contract size for one standard lot is 100 troy ounces of gold. Because XAUUSD is usually an OTC CFD symbol rather than an exchange-standardized contract, the broker's symbol specification is the final authority.
How much is 0.01 lot in gold?
If the broker uses a 100-ounce standard lot, 0.01 XAUUSD lot equals 1 troy ounce of exposure. A $1.00 move in gold is roughly $1.00 of profit or loss on 0.01 lots before spread, commission, swap, slippage, and currency conversion.
What is the XAUUSD pip value?
With the common 100-ounce contract and a 0.01 pip size, the XAUUSD pip value is about $1.00 per 1.00 lot when the account currency is USD. It is about $0.10 per 0.10 lot and $0.01 per 0.01 lot.
How do I calculate gold lot size for a $100 risk?
Measure the stop distance in gold price. If the stop is $5.00 away and your broker uses 100 ounces per lot, one standard lot risks $500. Divide $100 by $500 to get 0.20 XAUUSD lots.
Does leverage affect XAUUSD lot size?
Leverage affects required margin, not the stop-loss risk formula. If two traders use the same account equity, risk percentage, stop distance, and contract size, their risk-based lot size is the same even if one account has higher leverage. The higher-leverage account simply needs less margin to open the same exposure.
Why do XAUUSD calculators disagree?
They may use different assumptions for contract size, pip size, account currency conversion, volume rounding, spread, or balance versus equity. Match every calculator input to the symbol specification in your trading platform.
Is XAUUSD the same as gold futures?
No. XAUUSD on retail forex platforms is usually a spot-gold or gold-CFD symbol quoted against the U.S. dollar. Gold futures are exchange-traded contracts with standardized exchange rules. The 100-ounce convention is common in gold markets, but your XAUUSD CFD trade is governed by your broker's symbol settings and terms.
Sources and Verification
This article uses platform-level and regulator-level sources to keep the calculations grounded. Broker-level XAUUSD specifications still need to be verified inside your own trading platform before execution.
- MetaQuotes MQL5 Symbol Properties: official documentation for contract size, tick value, tick size, volume minimum, volume step, and margin-related symbol fields.
- CME Group Gold Futures Contract Specs: an exchange reference for standardized gold futures contract specifications. Retail XAUUSD CFDs can follow similar ounce conventions but remain broker-defined instruments.
- CFTC Forex Fraud Advisory: U.S. regulator guidance on the substantial risks of leveraged forex trading, margin trading, and fraud red flags.