Consistency Rule Calculator
Check a consistency rule against your daily P&L, see whether a payout request is possible today, and find the smallest extra profit, the fewest extra trading days and the daily cap that would get you there.
Your rule and your P&L
The most a single day may contribute, as a percentage. Read it from your firm's rules.
Winning days minus losing days. Losses make the rule harder to meet.
Leave blank if your rules have no minimum. Days with no P&L are not counted.
Total profit required before a payout, in your account currency. Leave blank for none.
Paste from a spreadsheet or type one figure per line. Profits are positive, losses negative. Dates are ignored.
Result
Enter at least one day of P&L to see the result.
What Is a Consistency Rule?
A consistency rule limits how much of your profit can come from a single trading day. The firm sets a percentage, and your best day has to stay at or below that percentage of a base figure, usually your profit. Firms typically use it to check that profit was built over several days instead of one outsized day. If your best day earned 600 and your total profit is 1,000, that day is 60% of the profit: it breaks a 40% rule and passes a 60% rule.
How the Calculator Works
The calculator compares your best day with the cap the rule allows.
best day ≤ (percentage ÷ 100) × base
The base is either your net profit for the period or the sum of your winning days, depending on what you choose. To plan a payout, it works out the extra profit needed: best day ÷ (percentage ÷ 100) minus the base, or more if a profit target needs it. The daily cap is the percentage of your final base, and the extra days are the extra profit divided by that cap, rounded up. Days with a P&L of exactly zero are not counted as trading days.
Worked Example: One Big Day
A trader makes 500 on day one and nothing else, under a 30% rule on net profit. The best day is 100% of profit, so the rule fails. To pass, net profit must reach 500 ÷ 0.30, about 1,666.67. That is roughly 1,166.67 more, and because no extra day may exceed 500 (30% of 1,666.67), it takes at least three more profitable days.
Worked Example: Losses on a Net-Profit Basis
Days of 600, -200 and 400 give net profit of 800 and a best day of 600, which is 75%. Under a 50% rule on net profit that fails, and net profit would need to reach 1,200, which is 400 more. If the firm measured against winning days only, the base would be 1,000 and the best day 60%, so winning days would need to total 1,200, only 200 more.
Worked Example: The Daily Cap
Net profit is 1,000 and the rule is 40%. One further day can add up to 666.66 and still pass, because 666.66 is 40% of the new total of 1,666.66. A day of 700 would be 700 out of 1,700, which is 41.2%, and breaks the rule.
Common Variants of the Rule
Firms word this rule in different ways, so read yours closely. The base can be net profit or winning days only. The test can be at or below the percentage, or strictly below it, so leave a small margin if your rule says below. Some rules count only certain days, such as days since your last payout, or count a day as a trading day only above a minimum profit. The rule may apply during an evaluation, at payout time, or both. Percentages vary between firms and programmes and can change. This calculator covers the two bases above. If your rule works differently, treat the result as a rough guide and check it against the firm's own wording.
Staying Within the Rule in Practice
Check the rule after every session instead of at payout time. Keep each day well under the cap, because the cap rises only as your total grows. A big winning day is not a problem on its own. It becomes one when the rest of the period is too small to carry it, which is why the fix is usually more profitable days. On a net-profit basis, losses matter too: a losing day can push your best day over the cap even though no new profit was made.
Educational tool, not financial advice. It applies the rule exactly as you enter it. It does not know your firm's wording, exclusions or processing conditions, and it cannot guarantee that any firm will approve a payout. Always follow your firm's own current rules.
Consistency Rule FAQ
What is the consistency rule in prop trading?
It is a payout or evaluation condition that stops a single day from supplying most of your profit. Your best day must stay at or below a set percentage of a base figure, usually your total profit. The percentage and the base come from your firm's rules.
How do I calculate my consistency percentage?
Divide your best single day by the base, then multiply by 100. With a best day of 300 and net profit of 1,000, the share is 30%. Compare it with your firm's limit: at or below passes, above fails. Paste your daily P&L into the calculator and it does this for you.
What consistency percentage should I expect?
There is no standard figure. Each firm sets its own percentage, and it can differ between programmes and change over time. A lower percentage is stricter, because it forces profit to be spread over more days. Use the exact figure from your firm's current rules.
Do losing days count against my consistency?
It depends on the base. If the rule measures against net profit, losing days reduce the base and make the rule harder to meet. If it measures against winning days only, losses do not change the base. Choose the option that matches your firm's wording.
What can I do if one day is over the limit?
The best day cannot be undone, so the usual route is to grow the base with further profitable days until that day is within the cap. The calculator shows how much extra profit and how many days that takes, and the daily cap that keeps new days from becoming the problem.
How are trading days counted here?
Any day with a profit or loss other than zero counts as a trading day. Days entered as zero do not. Firms count differently, for example by requiring a minimum profit or a minimum number of trades, so check your own rule.
Does passing this check mean my payout will be approved?
No. The calculator applies one rule to the figures you enter. A firm can apply other conditions, review the account, or word its rule differently, and nothing here guarantees a payout. This is an educational tool, not financial advice.
Is my P&L stored or sent anywhere?
No. The calculation runs in your browser and the figures you enter are not sent to our servers. They are gone when you close or refresh the page.