Consistency rule calculator
The consistency rule caps how much your best day may represent of total profit. If the firm requires 50% and your best day accounts for more than that, the payout is blocked even with the target met. The calculator shows your best day's weight and how much more you must trade to comply.
Enter the profit accumulated in the cycle, your best day's profit and the percentage your firm allows. The calculator tells you how much the best day weighs in the total, whether it is within the rule and, when it is not, how much profit still has to come in on other days — with no login and no sign-up.
To go deeper into each part of this calculation: Consistency rule · Payout · Valid trading days calculator
What this calculator solves
The consistency rule is the one that fails the most traders who have already passed. The target was hit, the drawdown was respected, and the payout is refused because a single day represents 45% of the cycle's profit when the firm allows 30%. The rule exists to separate people who trade from people who got lucky once — but it is silent: no trading platform shows the weight of your best day, and most people only find out when they request a payout.
The question that matters is not only "am I within the rule?". It is "how far am I from being within it?". A big day does not disappear from the history; what dilutes its weight is new profit on other days. The calculator answers both with three numbers you already have.
How the calculation works
Weight of the best day = best day's profit ÷ profit accumulated in the cycle. In a cycle of 8,000 where the best day made 3,000, the weight is 37.5%.
Maximum allowed for one day = accumulated profit × rule limit. With 8,000 accumulated and a 30% limit, no day could exceed 2,400 — and the 3,000 day already has.
Profit still needed = (best day ÷ limit) − accumulated profit. For a 3,000 day to fit within 30%, the cycle needs to reach 10,000; 2,000 are missing, and they have to come from other days. If one of those days is larger than 3,000, it becomes the new best day and the arithmetic restarts from it — which is why the number is a dilution target, not a licence for another big day.
When the accumulated profit is zero or negative, the calculator returns no percentage: a weight over a total that does not exist would be an invented number.
What the number does not tell you
Each firm defines the cycle's profit its own way: some add only the positive days, others use the net result, others reset the count at every payout. Confirm in your firm's rules which base applies before comparing with the percentage. The calculator uses the cycle's net result, which is the most common criterion.
The rule usually also applies to payout requests, not only to the evaluation phase. A payout requested with the best day above the limit can be refused even on a funded account.
From the calculation to tracking
Redoing this arithmetic after every logged result, across three or four accounts at different firms, is exactly the kind of task that gets forgotten in the week it matters. In TCC each account stores the firm's consistency limit, and the dashboard shows the best day's weight updated with every entry — with a warning before a payout request would be refused.