Risk Per Trade on Prop Accounts: Practise the Calculation

A headline account balance can make a small percentage look harmless. On an evaluation account, the usable loss buffer may be much smaller. Understand the account’s constraints and the planned loss on the actual position before selecting a size.

Start with the trade’s invalidation point

Choose the point where the idea no longer fits the plan. Convert the distance from entry into money using the contract specification. Changing that distance changes the planned loss at the same size. Fees and execution can make the final loss larger.

Use a hypothetical sizing example

With a $100 planned budget and $40 per-contract risk, two contracts use $80 and three use $120. Round down to whole contracts rather than increasing the budget to fit a desired size. If one contract already exceeds the budget, the idea may need to be skipped. These are teaching numbers, not a personal risk recommendation.

Compare the account buffer

Check which balance or equity measure counts toward the threshold, whether it trails, and any separate daily condition. A size that fits one plan may not fit another. Read the official terms for the exact stage.

Make the maths a game

Play five risk decisions, then use the position-size calculator with hypothetical inputs. In a chart round, review the original sizing decision after the result. A winning attempt does not prove the exposure was sensible.

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