Futures Prop Firm OffersMES Position Sizing: Stops, Fees and Slippage
Calculate Micro E-mini S&P 500 position size using tick value, stop distance, hypothetical commissions and slippage. Include contract limits and remaining drawdown.
MES Position Sizing: Stops, Fees and Slippage
A Micro E-mini S&P 500 position should be sized from its stop distance and complete expected trade cost, not from the nominal prop-account balance. MES uses a $5 index-point multiplier and a 0.25-point minimum tick, so one tick is worth $1.25 per contract.
These specifications were checked against CME Group's MES page on September 19, 2026. Firm commissions, contract permissions and limits must be checked separately.
Convert Stop Distance Into Dollar Risk
Stop risk per contract = stop distance in points × $5
| MES stop distance | Number of ticks | Price-movement risk per contract |
|---|---|---|
| 2 points | 8 | $10 |
| 4 points | 16 | $20 |
| 6 points | 24 | $30 |
| 8 points | 32 | $40 |
| 10 points | 40 | $50 |
This is the intended stop loss before fees and execution differences. A stop order does not guarantee a maximum realized loss.
Add Fees and an Execution Allowance
Assume a hypothetical $2 round-trip commission and two ticks of total adverse slippage. These are educational inputs, not any prop firm's quoted costs.
All-in planned risk = stop risk + round-trip fee + slippage allowance
Two MES ticks equal $2.50.
| Stop | Stop-only risk | Assumed round-trip fee | Assumed slippage | Planned risk per contract |
|---|---|---|---|---|
| 2 points | $10 | $2 | $2.50 | $14.50 |
| 4 points | $20 | $2 | $2.50 | $24.50 |
| 6 points | $30 | $2 | $2.50 | $34.50 |
| 8 points | $40 | $2 | $2.50 | $44.50 |
| 10 points | $50 | $2 | $2.50 | $54.50 |
Replace both assumptions with realistic figures from the trading platform and your execution history.
Calculate Contract Count
For a hypothetical $100 planned trade-risk budget:
Contracts = floor(risk budget ÷ planned risk per contract)
| Stop | Planned per-contract risk | Whole contracts within $100 | Combined planned risk |
|---|---|---|---|
| 2 points | $14.50 | 6 | $87 |
| 4 points | $24.50 | 4 | $98 |
| 6 points | $34.50 | 2 | $69 |
| 8 points | $44.50 | 2 | $89 |
| 10 points | $54.50 | 1 | $54.50 |
Round down. Rounding up can exceed the chosen budget before the trade begins.
Apply Prop-Firm Constraints
Remaining Drawdown
Use the current distance from the breach level, not the original account-size label. Open losses and commissions can reduce that room.
Daily Loss Capacity
The remaining daily allowance may be smaller than total drawdown. A plan must satisfy both.
Contract and Scaling Limits
A risk formula can produce six contracts while the account currently permits only four. The smaller allowed quantity controls.
Existing Positions
Add correlated exposure and pending orders. Sizing each order independently can hide combined risk.
A $1,000 Remaining-Drawdown Illustration
| Planned trade loss | Share of remaining drawdown | Full losses consuming $1,000, ignoring changing rules |
|---|---|---|
| $50 | 5% | 20 |
| $100 | 10% | 10 |
| $200 | 20% | 5 |
| $250 | 25% | 4 |
This is arithmetic, not a risk recommendation. Trailing thresholds, slippage and other costs may make the practical sequence shorter.
Before Sending the Order
- Verify the contract symbol and expiry.
- Place a technically justified stop.
- Convert the stop distance to dollars.
- Add actual costs and an execution allowance.
- Round the permitted quantity down.
- Compare with daily loss, drawdown and contract caps.
- Recheck combined exposure.
Conclusion
MES makes small risk adjustments possible, but small contracts do not make oversized positions safe. Calculate all-in risk first, then apply account limits. Review the drawdown worked examples when assessing available loss capacity.