FUTURES
MECHANICS / CHAPTER 08
Position Sizing
Position sizing determines how much exposure you take on a trade - and therefore how much money you can lose if the trade goes against you.
Choosing a market and finding an entry are only part of placing a futures trade. You also need to decide how many contracts to trade. That decision is position sizing.
In futures, position size matters enormously because every contract represents a fixed amount of exposure. Trading two contracts instead of one doubles the dollar impact of every tick. Trading ten instead of five does the same. The larger the position, the faster profits can accumulate. The same is true of losses.
Position size should begin with risk.
A common mistake is deciding how many contracts to trade first and thinking about risk afterward. A better process works in the opposite direction. First determine how much money you are willing to lose if the trade fails. Then determine where the trade becomes invalid and where the stop should be placed. Those two variables determine how many contracts you can reasonably trade.
Suppose you are willing to risk $500 on a trade. If your planned stop represents $50 of risk per contract, you could trade:
$500 ÷ $50 = 10 contracts
If the stop instead represents $100 of risk per contract:
$500 ÷ $100 = 5 contracts
Your acceptable dollar risk has not changed. Your position size has. This is the basic principle behind risk-based position sizing.
Contract size changes the calculation.
Not all futures contracts move by the same dollar amount. For example, the Micro E-mini Nasdaq-100 futures contract, MNQ, has a multiplier of $2 per index point.
A 25-point move therefore represents:
25 points × $2 = $50 per contract
If you trade five MNQ contracts, the same 25-point move represents:
25 points × $2 × 5 contracts = $250
At ten contracts, it becomes $500. At twenty contracts, it becomes $1,000. The market moved exactly the same distance in every example. Only the position size changed. That is why understanding the contract specification is essential before determining how many contracts to trade.
Stop distance and position size work together.
A wider stop generally requires a smaller position if you want to maintain the same dollar risk. A tighter stop can allow a larger position.
Suppose your maximum risk is $600.
With MNQ:
A 20-point stop risks $40 per contract, allowing up to 15 contracts.
A 50-point stop risks $100 per contract, allowing up to 6 contracts.
A 100-point stop risks $200 per contract, allowing up to 3 contracts.
In each case, the maximum planned loss remains approximately $600. This relationship is important because position size should adapt to the trade rather than forcing every trade into the same number of contracts.
Margin is not the same as risk.
Futures brokers require margin to open and maintain positions. But the amount of margin required does not tell you how much you should risk. A broker might allow your account to open a much larger position than your risk plan can reasonably support.
Available buying power answers: How large a position am I permitted to open?
Position sizing answers: How large a position should I open? Those are very different questions. The fact that your platform allows a trade does not make the trade appropriately sized.
Leverage magnifies sizing mistakes.
Futures provide substantial leverage. That leverage is one reason they are capital-efficient, but it also means an oversized position can produce large losses from relatively small market movements. A trader who consistently sizes positions according to predefined risk can use leverage deliberately.
A trader who chooses size based on confidence, excitement, frustration, or available buying power can quickly take far more risk than intended. Position size should therefore be determined before the trade—not while the market is moving.
Consistency matters more than maximum size.
The objective is not to trade the largest position your account can technically support. It is to choose a position that allows you to execute your strategy while keeping losses within acceptable limits. That may mean trading fewer contracts when volatility increases. It may mean reducing size after account drawdowns.
And it may mean trading much smaller than the broker's maximum permitted position. The correct position size is not the largest one available. It is the one that keeps the trade inside your risk plan.
Choosing a market and finding an entry are only part of placing a futures trade. You also need to decide how many contracts to trade. That decision is position sizing. In futures, position size matters enormously because every contract represents a fixed amount of exposure. Trading two contracts instead of one doubles the dollar impact of every tick. Trading ten instead of five does the same. The larger the position, the faster profits can accumulate. The same is true of losses.
Position size should begin with risk.
A common mistake is deciding how many contracts to trade first and thinking about risk afterward. A better process works in the opposite direction. First determine how much money you are willing to lose if the trade fails. Then determine where the trade becomes invalid and where the stop should be placed. Those two variables determine how many contracts you can reasonably trade.
Suppose you are willing to risk $500 on a trade. If your planned stop represents $50 of risk per contract, you could trade:
$500 ÷ $50 = 10 contracts
If the stop instead represents $100 of risk per contract:
$500 ÷ $100 = 5 contracts
Your acceptable dollar risk has not changed. Your position size has. This is the basic principle behind risk-based position sizing.
Contract size changes the calculation.
Not all futures contracts move by the same dollar amount. For example, the Micro E-mini Nasdaq-100 futures contract, MNQ, has a multiplier of $2 per index point.
A 25-point move therefore represents:
25 points × $2 = $50 per contract
If you trade five MNQ contracts, the same 25-point move represents:
25 points × $2 × 5 contracts = $250
At ten contracts, it becomes $500. At twenty contracts, it becomes $1,000. The market moved exactly the same distance in every example. Only the position size changed. That is why understanding the contract specification is essential before determining how many contracts to trade.
Stop distance and position size work together.
A wider stop generally requires a smaller position if you want to maintain the same dollar risk. A tighter stop can allow a larger position. Suppose your maximum risk is $600.
With MNQ:
A 20-point stop risks $40 per contract, allowing up to 15 contracts.
A 50-point stop risks $100 per contract, allowing up to 6 contracts.
A 100-point stop risks $200 per contract, allowing up to 3 contracts.
In each case, the maximum planned loss remains approximately $600. This relationship is important because position size should adapt to the trade rather than forcing every trade into the same number of contracts.
Margin is not the same as risk.
Futures brokers require margin to open and maintain positions. But the amount of margin required does not tell you how much you should risk. A broker might allow your account to open a much larger position than your risk plan can reasonably support.
Available buying power answers: How large a position am I permitted to open? Position sizing answers: How large a position should I open? Those are very different questions. The fact that your platform allows a trade does not make the trade appropriately sized.
Leverage magnifies sizing mistakes.
Futures provide substantial leverage. That leverage is one reason they are capital-efficient, but it also means an oversized position can produce large losses from relatively small market movements. A trader who consistently sizes positions according to predefined risk can use leverage deliberately.
A trader who chooses size based on confidence, excitement, frustration, or available buying power can quickly take far more risk than intended. Position size should therefore be determined before the trade—not while the market is moving.
Consistency matters more than maximum size.
The objective is not to trade the largest position your account can technically support. It is to choose a position that allows you to execute your strategy while keeping losses within acceptable limits. That may mean trading fewer contracts when volatility increases. It may mean reducing size after account drawdowns.
And it may mean trading much smaller than the broker’s maximum permitted position. The correct position size is not the largest one available. It is the one that keeps the trade inside your risk plan.
Choosing a market and finding an entry are only part of placing a futures trade. You also need to decide how many contracts to trade. That decision is position sizing.
In futures, position size matters enormously because every contract represents a fixed amount of exposure. Trading two contracts instead of one doubles the dollar impact of every tick. Trading ten instead of five does the same. The larger the position, the faster profits can accumulate. The same is true of losses.
Position size should begin with risk.
A common mistake is deciding how many contracts to trade first and thinking about risk afterward. A better process works in the opposite direction. First determine how much money you are willing to lose if the trade fails. Then determine where the trade becomes invalid and where the stop should be placed. Those two variables determine how many contracts you can reasonably trade.
Suppose you are willing to risk $500 on a trade. If your planned stop represents $50 of risk per contract, you could trade:
$500 ÷ $50 = 10 contracts
If the stop instead represents $100 of risk per contract:
$500 ÷ $100 = 5 contracts
Your acceptable dollar risk has not changed. Your position size has. This is the basic principle behind risk-based position sizing.
Contract size changes the calculation.
Not all futures contracts move by the same dollar amount. For example, the Micro E-mini Nasdaq-100 futures contract, MNQ, has a multiplier of $2 per index point.
A 25-point move therefore represents:
25 points × $2 = $50 per contract
If you trade five MNQ contracts, the same 25-point move represents:
25 points × $2 × 5 contracts = $250
At ten contracts, it becomes $500. At twenty contracts, it becomes $1,000. The market moved exactly the same distance in every example. Only the position size changed. That is why understanding the contract specification is essential before determining how many contracts to trade.
Stop distance and position size work together.
A wider stop generally requires a smaller position if you want to maintain the same dollar risk. A tighter stop can allow a larger position.
Suppose your maximum risk is $600.
With MNQ:
A 20-point stop risks $40 per contract, allowing up to 15 contracts.
A 50-point stop risks $100 per contract, allowing up to 6 contracts.
A 100-point stop risks $200 per contract, allowing up to 3 contracts.
In each case, the maximum planned loss remains approximately $600. This relationship is important because position size should adapt to the trade rather than forcing every trade into the same number of contracts.
Margin is not the same as risk.
Futures brokers require margin to open and maintain positions. But the amount of margin required does not tell you how much you should risk. A broker might allow your account to open a much larger position than your risk plan can reasonably support.
Available buying power answers: How large a position am I permitted to open?
Position sizing answers: How large a position should I open? Those are very different questions. The fact that your platform allows a trade does not make the trade appropriately sized.
Leverage magnifies sizing mistakes.
Futures provide substantial leverage. That leverage is one reason they are capital-efficient, but it also means an oversized position can produce large losses from relatively small market movements. A trader who consistently sizes positions according to predefined risk can use leverage deliberately.
A trader who chooses size based on confidence, excitement, frustration, or available buying power can quickly take far more risk than intended. Position size should therefore be determined before the trade—not while the market is moving.
Consistency matters more than maximum size.
The objective is not to trade the largest position your account can technically support. It is to choose a position that allows you to execute your strategy while keeping losses within acceptable limits. That may mean trading fewer contracts when volatility increases. It may mean reducing size after account drawdowns.
And it may mean trading much smaller than the broker’s maximum permitted position. The correct position size is not the largest one available. It is the one that keeps the trade inside your risk plan.
KEY TAKEAWAY
Start with the amount you are willing to lose, determine the risk per contract, and let those numbers determine your position size - not the amount of buying power your broker gives you.