Free tool
Consistency Rule Calculator
Paste your daily profits, set the firm’s limit, and instantly see whether your best day breaks the consistency rule, and how much more you need to make to fix it.
Result
How the consistency rule works
Most prop firms define consistency the same way: no single trading day’s profit may account for more than a fixed percentage (commonly 20%, 30%, or 40%) of your total profit at the time you request a payout or attempt to pass an evaluation. The rule exists to filter out traders who hit their target with one oversized, lucky trade rather than a repeatable process.
The math is simple: divide your best day by your total profit. If a $900 day sits inside $1,000 of total profit, that day is 90% of the total and fails a 30% rule badly. Importantly, you usually don’t need to lose the “bad” day; you need to keep trading until the total grows enough that the big day shrinks below the limit. This calculator solves that equation for you: it reports the exact additional profit required, spread across other days, to bring your best day under the firm’s threshold.
Frequently asked questions
Do losing days count toward the consistency rule?
Losing days reduce your total profit, which makes your best day a larger share of the total, so losses actually make the rule harder to pass. Enter losses as negative numbers and the calculator handles them correctly.
What happens if I break the consistency rule?
At most firms nothing is lost permanently: your payout or pass is simply delayed until your profit distribution evens out. A minority of firms treat it as a hard breach, so always check the specific firm’s rules on our profile pages.
Is exactly hitting the limit a pass or a fail?
A best day exactly at the limit (say 30.00% under a 30% rule) passes. Firms enforce the rule as “no day may exceed X%”, and this calculator uses the same convention.