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You can have the best strategy in the world. If you calculate your position sizes incorrectly, you will still lose money. Position sizing is the difference between a trader who survives long term and one who has blown up their account after three months.
Yet most traders neglect this topic to a reckless degree. In this article, I will show you the exact formula for position sizing in futures trading, work through examples for ES, NQ, and micro contracts, and explain the most common mistakes traders make when calculating position size.
Why position sizing is crucial
Imagine two traders. Both trade the same strategy with a 55% win rate. Trader A risks 5% of their account per trade. Trader B risks 1%. After a losing streak of 8 trades in a row (it happens, even with structured strategies), Trader A has lost 34% of their account. Trader B has lost 8%.
Trader A now needs a 51% gain just to get back to breakeven. Trader B needs 8.7%. Who will recover faster? Who will remain more emotionally stable?
Position sizing protects you from ruin. It ensures that individual losing trades do not destroy your account and that you still have enough capital after a drawdown phase to keep trading.
The basic rule: Never risk more than 1–2% of your account balance per trade. That sounds boring. But that exact boredom keeps you in the game.
The formula: calculating the number of contracts
For futures trading, calculating position size is straightforward. You need three values:
- Risk amount in dollars = account balance x risk percentage
- Risk per contract in dollars = stop distance in ticks x tick value
- Number of contracts = risk amount / risk per contract
The formula is:
Number of contracts = (account balance x risk%) / (stop distance in ticks x tick value)
Always round down. If the formula gives you 2.7 contracts, you trade 2. Never round up.
Tick values of the most important futures
Before you can calculate, you need to know the tick values. Here are the most important ones:
| Contract | Tick size | Tick value | Point value |
|---|---|---|---|
| ES (E-mini S&P 500) | 0.25 points | $12.50 | $50.00 |
| NQ (E-mini Nasdaq) | 0.25 points | $5.00 | $20.00 |
| MES (Micro E-mini S&P) | 0.25 points | $1.25 | $5.00 |
| MNQ (Micro E-mini Nasdaq) | 0.25 points | $0.50 | $2.00 |
| YM (E-mini Dow) | 1.00 points | $5.00 | $5.00 |
| RTY (E-mini Russell) | 0.10 points | $5.00 | $50.00 |
You can always find the tick value in your broker’s contract specifications or on the CME website.
Example calculations
Let’s work through this with concrete examples.
Example 1: NQ with a $50,000 account
- Account balance: $50,000
- Risk per trade: 1% = $500
- Stop-loss: 20 points = 80 ticks (NQ: 1 point = 4 ticks)
- NQ tick value: $5.00
- Risk per contract: 80 ticks x $5.00 = $400
- Number of contracts: $500 / $400 = 1.25 = 1 contract
Example 2: ES with a $100,000 account
- Account balance: $100,000
- Risk per trade: 1% = $1,000
- Stop-loss: 10 points = 40 ticks
- ES tick value: $12.50
- Risk per contract: 40 ticks x $12.50 = $500
- Number of contracts: $1,000 / $500 = 2 contracts
Example 3: MNQ with a $10,000 account
- Account balance: $10,000
- Risk per trade: 1% = $100
- Stop-loss: 25 points = 100 ticks
- MNQ tick value: $0.50
- Risk per contract: 100 ticks x $0.50 = $50
- Number of contracts: $100 / $50 = 2 micro contracts
Do you see the pattern? With a smaller account, you either need tighter stops or micro contracts to keep your risk at 1%. There is no trick to get around that.
Fixed Percentage vs. Fixed Dollar
There are two common methods for position sizing. Both have their place.
Fixed Percentage (percentage-based):
- You always risk X% of your current account balance
- Advantage: Your position size grows with your account and shrinks after losses
- Disadvantage: With small accounts, 1% can be so little that you cannot even trade 1 micro contract
- Recommended for: Most traders
Fixed Dollar (absolute):
- You always risk a fixed amount (e.g., $200 per trade)
- Advantage: Easy to calculate, no daily adjustment
- Disadvantage: Your percentage risk increases after losses (same dollar amount, smaller account)
- Recommended for: Traders with a stable account who prefer simplicity
My recommendation: Use Fixed Percentage. Recalculate your position size every Monday based on your current account balance. That way, your risk adjusts automatically.
Volatility adjustment
Not every trading day is the same. On a quiet day, NQ might move 100 points. On an FOMC day, it can be 400 points. Your position sizing should account for that.
ATR-based adjustment:
ATR (Average True Range) measures average daily volatility. When ATR rises, the market is more volatile and your stop-loss should be wider. That automatically means fewer contracts at the same risk.
In practice: If the 14-day ATR in NQ is at 250 points and suddenly rises to 400, you reduce your position size. Not because you are afraid, but because your stop-loss has to be wider so you do not get stopped out by normal noise.
Rule of thumb:
- Low volatility (ATR below average): normal position size
- High volatility (ATR 50%+ above average): reduce position size by 30–50%
- Extreme volatility (news days, crashes): minimum position size, or do not trade at all
Position sizing on accounts with fixed loss limits
If you trade an account with predefined loss limits, an evaluation or funded account for example, additional rules apply. Such accounts have strict drawdown limits that directly affect your position sizing.
Typical drawdown rules:
- Maximum daily drawdown: $1,000–$2,500 (depending on account size)
- Maximum total drawdown: $2,500–$5,000
- Trailing drawdown: moves with your equity high
With a daily drawdown limit of $1,500 and a maximum of 3 trades per day, you may risk at most $500 per trade (not $1,500, because you want a buffer). That significantly limits your number of contracts.
Calculation example: account with a daily loss limit
| Parameter | Value |
|---|---|
| Daily drawdown limit | $1,500 |
| Planned trades per day | 3 |
| Risk per trade | $500 |
| NQ stop-loss | 20 points (80 ticks) |
| Risk per NQ contract | 80 x $5.00 = $400 |
| Max. contracts | $500 / $400 = 1 NQ |
On an account with a fixed loss limit, conservative position sizing matters even more than in your own account. Once the limit is breached, the account is gone, along with the fee already paid and the work invested in it.
Common position sizing mistakes
I see these mistakes over and over again. And every single one can cost you your account:
1. No fixed risk per trade. “I’ll just take 2 contracts” without calculating. That is not position sizing—that is guessing. Every trade must be calculated.
2. Rounding risk up. The formula says 1.8 contracts, the trader takes 2. Over hundreds of trades, that extra risk adds up significantly.
3. Ignoring losses. After three losing days, continuing to trade the same number of contracts even though the account has shrunk. Your risk percentage then increases unnoticed.
4. Too much account risk. 5% per trade does not sound like much. But 5 losses in a row is a 25% drawdown. It happens. At 1% risk, it is a 5% drawdown. That is manageable.
5. Widening the stop-loss after the fact. You calculate your risk with a 15-point stop, but in the trade you move the stop to 30 points. That doubles your risk without adjusting the number of contracts.
6. Ignoring correlated positions. If you are long NQ and ES at the same time, you do not have 1% risk. You effectively have 2% (or more) because both markets are strongly correlated.
Position sizing checklist for every trade
Use this checklist before you enter a trade:
- What is my current account balance?
- What is my maximum risk per trade (1% or 2%)?
- Where is my stop-loss in ticks?
- What is the contract’s tick value?
- How many contracts does the formula give me?
- Have I rounded down?
- Do I have other open positions that increase total risk?
- Is volatility normal today or elevated?
If you have a clear answer to every question, you are ready for the trade. If not, calculate again.
Conclusion: Position sizing is your most important tool
Position sizing is not sexy. It will never be on the cover of a trading magazine. But it is the reason some traders become profitable after 12–18 months and others have already liquidated their third account.
The formula is simple. The discipline to apply it consistently is not. But that is exactly what sets professional traders apart: they calculate their position size before every single trade. No exceptions.
If you want to learn how to integrate position sizing into a complete trading system (with risk management, journaling, and clear rules), take a look at the TPTE Academy. And if you have questions about your specific situation, book a free initial consultation. We will work through it together.
