Standard, mini and micro lots (0.01): what volume means in MetaTrader 5 and how to calculate the real dollar risk of every position in your portfolio.
When you open an order in MetaTrader 5, the most important field is not the entry price, not even the Stop Loss. It is a small box called "Volume". That number —0.01, 0.10, 1.00— is the multiplier that converts every market movement into real dollars won or lost.
Choosing that number badly is the fastest way to destroy an account, even while copying a statistically winning strategy.
What Is a Lot: The Market's Base Contract
A lot is the standardized unit of volume of a trade. In Forex:
- Standard lot (1.00): 100,000 units of the base currency. On EURUSD, each pip is worth ~$10 USD.
- Mini lot (0.10): 10,000 units. Each pip is worth ~$1 USD.
- Micro lot (0.01): 1,000 units. Each pip is worth ~$0.10 USD. It is the minimum volume at the vast majority of brokers.
On other instruments the contract changes: on XAUUSD (Gold), 1 lot usually equals 100 ounces, and on indices like the NASDAQ (NDX) or the US30 it depends on the broker's specification. You can always verify it in MetaTrader: right click on the symbol → Specification.
The Three Numbers MetaTrader Forces You to Respect
Every symbol has three volume constraints defined by the broker:
- Minimum volume: normally 0.01 lots.
- Volume step: the allowed increments (0.01 at most brokers).
- Maximum volume: the ceiling per order (typically 50 or 100 lots).
The Equation That Links Lot, Pip and Risk
The real risk of a position is calculated with a single multiplication:
Risk = Lots × Stop Loss distance (in pips) × Pip value
Example with Real Numbers
An algorithmic strategy trades EURUSD with an 80-pip Stop Loss:
- With 0.01 lots: 80 × $0.10 = $8 of risk. On a $1,000 account, 0.8%: institutional management.
- With 0.10 lots: 80 × $1 = $80 of risk. On the same account, 8%: three consecutive losses (statistically normal) destroy almost 25% of the capital.
The strategy is identical. The difference between survival and ruin is exclusively the lot size. That is why leverage gets the media blame, but the lot is the one who executes the sentence.
Lot Sizing in Copy Trading: The Parameter You DO Control
When you subscribe to a copy trading system you don't control the entry logic or the Stop Loss distances: those decisions come from the master algorithm. What you do define is the lot size with which the trades are replicated in your account.
This makes lot sizing your only risk management lever as a subscriber:
- Lot proportional to your capital: the same system can be conservative at 0.01 lots with $1,000 and suicidal at 0.10 lots with that same capital.
- Lot per instrument: in a diversified portfolio (Gold, indices, major pairs), each instrument has different volatility and pip value; using the same lot for all of them is a common calibration error.
- Combined drawdown: if you copy several systems simultaneously, the floating drawdowns add up. Multi-asset risk management requires calculating the joint exposure, not each system's separately.
> [!TIP]
> Calculate your lot size with data, not intuition
> The AbacuQuant Portfolio Builder is built exactly for this: you choose the instruments, define each one's lot size according to your capital, and the engine calculates the projected combined drawdown of the entire portfolio. If the lot size leaves you undercapitalized, you'll know before subscribing, not after the first Margin Call.
