What is the consistency rule and why does it exist?
The consistency rule is a policy enforced by a growing number of prop firms that prevents any single trading day from making up more than a set percentage of your total profit — typically 30% to 50%. For example, if a firm enforces a 30% consistency rule and your total profit target is $10,000, no single day can contribute more than $3,000 of that total.
The rule exists because prop firms want to fund genuinely skilled traders, not lucky ones. A trader who makes $9,000 in a single day and then trades flat has not demonstrated consistent edge — they may have made one over-leveraged gamble that happened to work. The consistency rule filters out this type of behaviour by requiring profits to be spread across multiple trading sessions.
How the rule catches traders off guard
The most common scenario where traders fail the consistency rule is a strong early day. Imagine you are on a $100,000 account with a $10,000 profit target and a 30% consistency cap. On day one you have an exceptional trade and make $4,500 — nearly halfway to your target. You are now in trouble: any subsequent day where your cumulative profit passes $15,000 must come in under $4,500 per day, meaning your first day has now permanently capped the maximum you can earn on any other day.
This is not intuitive. Most traders celebrate a big day and do not realise they have constrained the rest of their challenge. Use this calculator at the end of each trading day to check whether your best day is approaching the consistency threshold, and adjust your sizing for subsequent days accordingly.
Strategies for staying consistent
The cleanest approach is to aim for similar daily profit targets throughout the challenge. If your profit target is $10,000 over 20 days, target $500 per day and take profits when you hit it. This is not always possible in live markets — some days have better conditions than others — but having a daily target helps you avoid the “let winners run until they ruin the consistency check” trap.
If you have already had a large day, reduce your position size for the remainder of the challenge to ensure no other single day approaches or exceeds your best day in absolute dollar terms. Some traders track this with a spreadsheet; this calculator does it for you automatically.
Which firms use the consistency rule?
Not all prop firms enforce a consistency rule. FTMO, for example, does not have one. Firms like The Funded Trader and some others do. Always read the full terms of your specific challenge before trading. When comparing firms, use our Prop Firm Comparison Tool to filter on this criterion.
This calculator is for informational purposes only. Always verify your firm's consistency rule details on their official website.