Coming from forex or CFDs, you’re used to sizing risk continuously — any fraction of a lot you like. Futures size in whole contracts, and that discreteness feels like a downgrade until you learn the two-step method and the micro that hands the precision back.
Start from dollar risk, never from contracts
The mistake every transitioning trader makes is asking “how many contracts should I trade?” first. That’s backwards. Contract count is the output, not the input.
The input is your dollar risk per trade — the fixed amount you’re willing to lose if the stop hits. On a prop account this is anchored to your drawdown, not your mood: a sensible per-trade risk is a small slice of the room between your equity and the firm’s loss limit, so a normal string of losers can’t breach you. Decide that dollar number before you look at the chart. It doesn’t change because a setup looks good.
Everything after this is arithmetic. Get the dollar risk right and the sizing takes care of itself.
The two-step method: dollars to ticks to contracts
Futures sizing is two divisions. That’s the whole method.
Step 1 — Stop distance in ticks. Your stop is a price level; convert the distance from entry to stop into ticks. Each instrument has a fixed tick size (ES/MES move in 0.25-point increments, MCL in $0.01, and so on).
Step 2 — Divide, then divide again. Cost per contract = stop-in-ticks × the tick value. Then contract count = your dollar risk ÷ cost per contract.
Worked in words: if your stop is 40 ticks wide on MES (tick value $1.25), each contract risks 40 × $1.25 = $50. If your per-trade dollar risk is $150, that’s 150 ÷ 50 = 3 MES. Round down to whole contracts — never up.
These are the fixed tick values worth committing to memory. They’re standard CME specs; confirm the current numbers with the exchange:
| Contract | Tick size | Tick value | Micro sibling | Micro tick value |
|---|---|---|---|---|
| ES (S&P 500) | 0.25 | $12.50 | MES | $1.25 |
| NQ (Nasdaq 100) | 0.25 | $5.00 | MNQ | $0.50 |
| CL (Crude Oil) | 0.01 | $10.00 | MCL | $1.00 |
| GC (Gold) | 0.10 | $10.00 | MGC | $1.00 |
| 6E (Euro FX) | 0.00005 | $6.25 | M6E | $1.25 |
Every micro is one-tenth of its full-size sibling (6E/M6E aside, where the ratio differs slightly — confirm the spec). That one fact is what makes the next section work.
Why micros give back the precision you lost
The complaint about futures is real: on a mini, contract count is a blunt dial. Jumping from 1 ES to 2 ES doubles your risk in a single click — there’s no 1.4 contracts to smooth it. Coming from continuous forex sizing, that feels crude.
Micros dissolve the problem. Because MES risks a tenth of ES per tick, sizing in micros gives you ten times the resolution:
- Instead of “1 or 2 ES,” you can trade 11, 12, 13… MES — effectively 1.1, 1.2, 1.3 minis.
- You can hold most of your position in minis and fine-tune the last increment in micros (e.g. 2 ES + 3 MES = 2.3 ES-equivalent).
- Your dollar risk lands almost exactly where you wanted it, instead of being forced to the nearest full mini.
That’s the continuous-sizing feel of forex, rebuilt on standardized exchange contracts. Run your stop and dollar risk through the futures contract calculator to see the micro count directly, and use a position size calculator when you want to work backwards from a per-trade risk to the exact contract mix.
Anchor the size to your drawdown, not the setup
A clean contract count is worthless if the dollar risk feeding it is too big for the account. On a prop evaluation the binding constraint isn’t your win rate — it’s the loss limit, especially a trailing one that ratchets up under your equity as you profit.
- Size so a losing streak survives. Your per-trade risk should be small enough that several consecutive stops don’t approach the daily or trailing limit.
- Re-check the floor after a green run. A trailing floor rises with your peak; the room you had this morning may be smaller after a strong session. Model it deliberately rather than eyeballing it.
- Let micros hold the line. Early in an account, size the whole position in micros so a rough patch nibbles the cushion instead of gouging it.
The point of thinking in R and dollars — not contracts — is that your sizing stays constant while the market doesn’t. Learn what an R-multiple is and every trade becomes measurable in the same unit regardless of instrument.
Prove the method with your own fills
The two-step method is only as good as the discipline behind it — and discipline is invisible until you measure it. Did you actually size every trade off a fixed dollar risk, or did you quietly add a contract on the ones that “felt right”? Your memory won’t tell you honestly.
Shibiki auto-journals every fill and reads your sizing back as live edge health, so the drift between your plan and your clicks becomes visible while you can still correct it. The math above is universal; whether you followed it is a question only your tracked numbers answer.
Related: Futures Contract Calculator · Position Size Calculator · R-Multiple