Max Position Size
The most contracts a firm lets you hold at once — a built-in guardrail that keeps a single trade from ever deciding your account's fate.
Max position size — the contract cap — is the maximum number of contracts you’re allowed to hold at any one moment on a given account. It scales with account size, and it’s usually enforced by the platform itself: try to exceed it and the order is simply rejected.
Treat that rejection as a friend. The cap exists so that no single trade can take out an account that took you weeks to earn. It’s the firm underwriting your discipline for you.
The cap and your drawdown are two halves of one calculation. Suppose you’re on a $50K account with a $2,500 drawdown and a cap that permits several ES contracts. Just because you can trade the maximum doesn’t mean the math works:
| Position | Stop distance | Risk per contract | Total risk | % of $2,500 drawdown |
|---|---|---|---|---|
| 1 MES | 8 points (32 ticks) | $40 | $40 | 1.6% |
| 5 MES | 8 points (32 ticks) | $40 | $200 | 8% |
| 1 ES | 8 points (32 ticks) | $400 | $400 | 16% |
| 3 ES | 8 points (32 ticks) | $400 | $1,200 | 48% |
Same stop, same idea, wildly different consequences. At 3 ES, two ordinary losing trades erase almost your entire cushion. At 5 MES, you could take a dozen losses in a row and still be trading. The cap is the ceiling — your own limit should sit well below it.
The rule most funded traders converge on is risking a small fixed fraction of remaining drawdown room per trade, commonly 1–2%. Work backwards from that number to your contract count using tick value, and the position size stops being a judgment call and becomes arithmetic.
Trade well inside the cap and you’re playing a long game the account can actually survive. Read max contracts and position sizing for the full method, and compare contract limits across firms in our directory.