Source: https://whitepips.com/blog/sizing-against-the-limit Summary: How to turn a published drawdown into a per-trade position size, and why the arithmetic should be done once rather than trade by trade. Last updated: 2026-10-28 # Position sizing against a loss limit, not a feeling How to turn a published drawdown into a per-trade position size, and why the arithmetic should be done once rather than trade by trade. - August 27, 2026 - 2 min read - 4 sections - Risk **In this article 4** 1. The arithmetic 2. Then check it against the drawdown 3. Why conviction sizing fails here 4. Leverage is a ceiling, not a target Back to top August 27, 2026 2 min read Risk ## Key takeaways 1. **The arithmetic.** Start from the smaller of your two limits — the daily loss — and work back. 2. **Then check it against the drawdown.** The daily limit governs a session; the maximum drawdown governs the account. 3. **Why conviction sizing fails here.** Scaling up on high-conviction setups is defensible in principle and disastrous in this context, for a reason that has nothing to do with whether your conviction is accurate. 4. **Leverage is a ceiling, not a target.** Plans publish a maximum leverage, and it is routinely mistaken for a recommendation. Most people size positions by feel, adjusted by conviction. On a personal account that is merely expensive. On a funded account it is fatal, because the account has a hard floor and a strategy that survives on average can still find the floor on a run of losses. The fix is to derive size from the rules once, before the first trade, and then not to revisit it during a session. ## The arithmetic Start from the smaller of your two limits — the daily loss — and work back. 1. Take the daily loss limit in currency. On a $50,000 account with a 4% daily limit, that is $2,000. 2. Decide how many consecutive losses a normal bad day contains for you. If you take three trades and can lose all three, that is three. 3. Divide, then halve. $2,000 across three losers is $667; halving it gives roughly $330 of risk per trade, and the half is what leaves you a day rather than a breach when the fourth trade also loses. 4. Convert that risk figure into a position size using your actual stop distance, per instrument. This is the number you trade — not a lot size you remember from another account. Every figure above is an illustration of the method. Use your own plan's published daily limit and your own stop distances; the shape of the calculation is what transfers, not the numbers. ## Then check it against the drawdown The daily limit governs a session; the maximum drawdown governs the account. Run the same size through a losing streak — six, eight, ten trades — and see whether the account survives it. If ten losses at your calculated size breaches the overall floor, the size is wrong regardless of what the daily arithmetic said. Ten consecutive losses is not a pessimistic assumption. On a strategy that wins 45% of the time it is an ordinary occurrence over a few hundred trades, and an evaluation is easily a few hundred trades. > Ten losses in a row is not a worst case. On a 45% win rate it is a Tuesday, and your size has to survive it. ## Why conviction sizing fails here Scaling up on high-conviction setups is defensible in principle and disastrous in this context, for a reason that has nothing to do with whether your conviction is accurate. Conviction correlates with recent results. You feel most certain after a run of winners and most tentative after losses — which means variable sizing systematically puts your largest position on immediately before a losing streak begins, and your smallest immediately before a recovery. The sizing amplifies the swing in exactly the wrong direction. Flat sizing gives up some theoretical edge and buys the thing an evaluation actually requires, which is surviving to the end of the sample. ## Leverage is a ceiling, not a target Plans publish a maximum leverage, and it is routinely mistaken for a recommendation. It is a limit on what the platform will let you do, set so it does not bind on any reasonable position. If your sizing arithmetic ever brings you close to it, the arithmetic has gone wrong somewhere upstream. More in Risk [Holding over the weekend on a prop account: swaps and gaps](https://whitepips.com/blog/weekend-holding-and-swaps) [Prop firm rules explained: every limit in one place](https://whitepips.com/blog/prop-firm-rules-explained) [Max exposure and max floating loss: two rules to watch](https://whitepips.com/blog/max-exposure-and-floating-loss) [Read next Static and trailing drawdown, side by side Risk · 2 min read](https://whitepips.com/blog/static-and-trailing-drawdown) Educational content, not financial advice. Trading carries risk and most people who attempt an evaluation do not pass it. Accounts are simulated; the rules that bind yours are the ones printed on your plan and in the trading rules. [All articles](https://whitepips.com/blog) ## Related articles Risk August 31, 2026 2 min read ### Static and trailing drawdown, side by side The single rule that decides the most evaluations, and the one most often misread. What each does once you are in profit. [Read the article](https://whitepips.com/blog/static-and-trailing-drawdown) Risk August 29, 2026 2 min read ### The daily loss limit, and the hour it resets A smaller number than the drawdown, and the one that ends more accounts. What it measures, when the day rolls, and why that matters. [Read the article](https://whitepips.com/blog/the-daily-loss-limit) Risk August 26, 2026 2 min read ### Why there is no deadline, and what to do with it Removing the clock from an evaluation changes how it should be traded. Most people carry on racing anyway. [Read the article](https://whitepips.com/blog/no-time-limit) ## Ready to see the plans? Every plan, size and price, with the rules printed before you buy. 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