Position sizing in futures is one of the most important aspects of risk management, yet most traders obsess over entries. Which setup, which indicator, which level. Entries feel like the skill. But after watching thousands of trades, mine and the ones our platform runs in public, I am convinced the entry is the least important decision you make. Position sizing is what separates the traders who are still here next year from the ones who are not.
Here is the uncomfortable truth: you can be right more than half the time and still go broke. All it takes is sizing a few losers too big. Position sizing in futures is the difference between a losing trade that stings and a losing trade that ends your account. This piece is about getting that math right, in plain terms, with the contracts you actually trade.
The mistake almost everyone makes is sizing off margin. The broker says you can hold five contracts, so you hold five. That is backwards. Margin tells you what you are allowed to do. It says nothing about what you should do.
Size off risk instead. Decide, before the trade, the most you are willing to lose if you are wrong. Then let that number and your stop distance tell you how many contracts to hold. The formula is simple:
Everything downstream flows from those three inputs. Get them right and the contract count is just arithmetic.
You cannot size a futures trade without knowing what one point of movement is worth in your contract. The micro futures, which are one tenth the size of the classic e-minis, make this manageable for normal-sized accounts. A few of the common ones:
| Contract | Market | Value per 1.00 point |
| MES | Micro S&P 500 | $5.00 |
| MNQ | Micro Nasdaq 100 | $2.00 |
| M2K | Micro Russell 2000 | $5.00 |
| MYM | Micro Dow | $0.50 |
| MGC | Micro Gold | $10.00 |
So a 10 point move in MES is $50 per contract. A 10 point move in MNQ is $20. Same “10 points,” very different dollars. This is why a fixed contract count across different markets is a sizing error hiding in plain sight.
So a 10 point move in MES is $50 per contract. A 10 point move in MNQ is $20. Same “10 points,” very different dollars. This is why a fixed contract count across different markets is a sizing error hiding in plain sight.
Contracts = $250 / $50 = 5 contracts.
Now change one input. Your stop is wider, 20 points, because the setup needs more room. One contract now risks $100. Same $250 budget gives you 2 contracts (2.5, rounded down, and you always round down). The wider stop did not change your risk. It changed your size. That is the whole point. Your dollar risk stays fixed and the position flexes to fit it.
This is also where the micros earn their keep. On a small account, the full-size ES would force you into all-or-nothing sizing. The micros let a $5,000 account take a real trade with a sane stop and still risk only 1 percent. You can build a calculator for this in a spreadsheet, or use a free position size calculator that handles the tick math for you.
The contract count is mechanical once you pick a risk percentage. Picking that percentage is the judgment call. For most people trading their own money, somewhere between 0.5 and 1 percent of the account per trade is the honest range. Lower than that and a normal win barely moves the needle. Higher than that and a normal losing streak does real damage.
Run the arithmetic on a streak before you dismiss it. At 2 percent risk per trade, a run of ten losers, which every strategy produces eventually, draws your account down by roughly 18 percent. At 5 percent risk, that same ten losers is closer to a 40 percent hole, and you now need a 67 percent gain just to get back to flat. The market does not owe you that recovery. Small, fixed risk is not timidity. It is how you survive long enough for your edge to show up.
Once your risk per trade is fixed, stop counting profit in dollars and start counting it in R. One R is the amount you risked. If you risk $250 and a trade makes $500, that is a 2R win. A trade that hits your stop is a 1R loss. This single habit clarifies everything, because it lets you compare trades across different markets and account sizes on the same scale.
R also tells you the win rate you actually need. The breakeven win rate is 1 divided by (1 plus your reward in R). If your average winner is 2R, you only need to be right 1 in 3 times to break even. That is the quiet power of sizing and asymmetry together: you do not need to be right often, you need your winners to be bigger than your losers and your size to be consistent. We publish every one of our trades, winners and losers, in public, and the equity curve is built far more on that consistency than on any single call.
A few sizing errors show up again and again:
Sizing off margin instead of risk. Covered above, and it is the big one.
Round-number contracts. Holding “5 because 5 feels right” instead of the number the math gives you. The math does not care about round numbers.
Revenge sizing. Doubling up after a loss to win it back fast. This is the fastest way to turn a normal drawdown into a crater. Your risk percentage does not get a vote after a bad trade.
Ignoring correlation. Long MES and long MNQ at the same time is not two trades. It is close to one big trade on the same idea. Size the cluster, not each leg in isolation.
Good market analysis, the kind Dorian Trader covers daily, helps you frame the trade and pick the level. But framing is only half the job. Sizing decides whether being right actually pays you, and whether being wrong is survivable. The best read in the world will not save a position that was too big to hold.
The reason to write your sizing process down is that the moment you most need it is the moment you least want to follow it. After three losses in a row, when the next setup looks perfect, that is exactly when discretion fails. A fixed risk percentage and a formula remove the decision from the heat of the moment. You are not deciding how many contracts to hold. You already decided. You are just doing the arithmetic.
Entries will always feel like the craft. Sizing is the part that keeps you around to practice it.
For most traders using their own capital, 0.5 to 1 percent per trade is a sound range. It keeps a normal losing streak survivable while still letting wins matter. Higher risk per trade compounds drawdowns fast, and the recovery math gets brutal above a few percent.
Take the dollars you are willing to risk, then divide by your stop distance in points times the contract’s point value. MES is $5 a point, MGC is $10 a point. A $200 risk with a 10 point MES stop is $200 divided by (10 x $5), which is 4 contracts. Always round down.
Off risk, always. Margin is the broker’s permission to hold a position. It tells you nothing about whether the size is appropriate for your account or your stop. Many blown accounts come from treating available margin as a target.
The micros are one tenth the size, so they let normal accounts size precisely and risk a small, fixed percentage on each trade. On a small account the full-size contracts force crude, all-or-nothing sizing. The micros give you the granularity that disciplined risk control requires.
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About the Author
Angelo Marasa | Founder of A-TLT (Autonomous Trendline Trading)
Angelo Marasa is the founder of A-TLT, a platform that trades futures using a rules-based trendline method and publishes every trade, wins and losses, in public.
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