Prop Firm Consistency Calculator — Is Your Best Day Too Big?

A cap on how much of your total profit is allowed to come from a single trading day, usually checked before a payout or before an evaluation is considered passed. Firms publish this as a percentage -- commonly 20-50% depending on the firm -- meaning your single best day cannot account for more than that share of everything you have made.

Your best-day share is your best day's profit divided by your NET profit across every trading day, including days you lost money -- not divided by only your winning days, and not divided by the firm's profit target. Dividing by a smaller, wins-only number understates your real share and can tell you that you are compliant when the firm's own math says you are not. A losing day lowers your net profit, which can push an otherwise fine best day over the cap.

Yes, and it is a meaningful number when it happens -- it means your other trading days were net negative overall, so your one profitable day is carrying more than all of your profit by itself. This calculator reports it as-is (for example 133% or 200%) rather than capping it at 100%, since the real number is what a firm actually checks.

Depends on the firm -- some only enforce it before a payout on a funded account, others enforce it during the evaluation too, and the percentage itself sometimes differs between the two. Check your specific firm's current rules for your account type; this calculator runs on whatever cap percentage you enter.

Yes -- no signup, no card. If you want your consistency rule checked automatically against your actual logged trades, with an alert before a payout request would breach it, that is what a Fillbook account does.