Futures Position Sizing: How Many Contracts to Trade
The futures position sizing formula: dollar risk divided by stop distance times point value, plus fees. Worked NQ, MNQ, ES and MES examples, prop firm limits.
Position sizing answers one question before every trade: how many contracts can I trade so that, if my stop is hit, I lose the amount I planned and not a dollar more? In futures the answer comes from three numbers: your dollar risk, your stop distance and the contract's point value.
The formula
Contracts = dollar risk ÷ (stop in points × point value + fees per contract)
Round the result down to a whole number. Rounding down keeps the real loss at or under your budget.
| Contract | Point value | Tick |
|---|---|---|
| NQ | $20 | 0.25 = $5.00 |
| MNQ | $2 | 0.25 = $0.50 |
| ES | $50 | 0.25 = $12.50 |
| MES | $5 | 0.25 = $1.25 |
The micro futures tick value table has YM, RTY, crude oil and gold too.
Worked examples
You plan to risk $200 with a 10 point stop. Fees here are an example of $2.80 per round turn on the full size contracts and $0.74 on micros. Use your own broker's or firm's numbers.
| Contract | Risk per contract | $200 ÷ risk | Contracts | Real risk |
|---|---|---|---|---|
| NQ | 10 × $20 + $2.80 = $202.80 | 0.99 | 0 | none |
| MNQ | 10 × $2 + $0.74 = $20.74 | 9.6 | 9 | $186.66 |
| ES | 10 × $50 + $2.80 = $502.80 | 0.40 | 0 | none |
| MES | 10 × $5 + $0.74 = $50.74 | 3.9 | 3 | $152.22 |
Two things stand out. First, fees can tip you under one contract: 10 points on NQ is exactly $200, but with fees the loss would be $202.80, over budget. Second, the micros let you get close to your planned risk, while the full size contracts only come in big steps.
The futures position size calculator runs this for any contract, stop and budget.
Choosing the dollar risk
The formula needs a dollar risk, and that is where most of the thinking is.
- Personal account: many traders pick a small fixed share of the account per trade, so a losing streak can't do serious damage.
- Prop firm account: size from the rules, not the account size. Take the room left to your max loss, or your daily loss limit if that is closer, and divide it by the number of losing trades you want to survive. With a $1,000 daily limit and four losses allowed, that is $250 per trade.
- Keep it steady. Doubling size after a loss to win it back is how a normal losing streak turns into a failed account. See revenge trading.
Stops first, size second
Choose the stop from the chart: the price where your trade idea is wrong. Then let the stop decide the size. Doing it the other way round, picking a size and squeezing the stop to fit, puts stops where normal noise hits them.
Prop firm limits
Evaluations usually cap your position, often written as a number of minis or ten times as many micros, for example 5 NQ or 50 MNQ. Some firms also scale the limit up as your balance grows. Your size is the smaller of the formula's answer and the firm's limit.
Practice sizing until it is automatic
In ChartTrainer the order ticket sizes your trade from your dollar risk and stop for futures, forex lots, crypto coins and stock shares, and evaluation accounts enforce position limits like a prop firm would. Practice on replayed sessions in the futures simulator.
Questions
- What is the formula for futures position size?
- Contracts = dollar risk ÷ (stop distance in points × point value + round turn fees per contract), rounded down to a whole number.
- Why round the number of contracts down?
- Rounding down keeps the loss at your stop at or under the amount you planned to risk. Rounding up always risks more than your budget.
- How much should I risk per trade?
- That is your decision and depends on your account's rules. A common way to think about it in a prop firm account is to divide the room to your max loss or daily limit by the number of losing trades you want to survive, for example $1,000 ÷ 4 = $250.
- What if the result is zero contracts?
- Your stop is too wide for your risk on that contract. Use the micro version (MNQ for NQ, MES for ES), tighten the stop only if your setup allows it, or skip the trade.