Prop Firm Consistency Rule Calculator
Find out whether your best day is too big a share of your profit, and exactly what it takes to fix it. Free, no sign-up.
Only used to estimate how many more trading days a fix would take.
Enter your best day and total profit to see your consistency percentage, whether it clears the limit, and what it would take to fix a breach.
Limits we track in the app: TopStep 50%, Apex Trader Funding 30%. Firms change their rules, and the number often differs by account size and phase, so confirm yours before you rely on it.
How the consistency rule is calculated
The rule compares one day against everything you made. The formula is:
Say you are up $3,000 on the evaluation and your strongest day made $1,200. That day is 40% of your total profit. Under a 30% limit you are in breach, and the fix is arithmetic: you need total profit of $4,000 for a $1,200 day to sit on the line, so another $1,000 has to come from other days.
Two details catch people out. Most firms count only profitable days when adding up total profit, so a losing day pushes your percentage up rather than down. And the check usually happens at the end of the evaluation or at a payout request, which is why traders discover the problem after the money is supposedly earned.
There is no way to shrink a day that already happened. The only lever is adding profit elsewhere, which means trading smaller and more often for a stretch. Traders who blow through the rule usually do it by trying to fix a big day with another big day.
Consistency rule FAQ
What is the consistency rule in a prop firm challenge?
It caps how much of your total profit can come from one day. If the firm sets a 30% limit and you are up $3,000 overall, no single day may account for more than $900 of it. The firm is checking that the account grew through a repeatable process rather than one outsized trade.
How is the consistency rule calculated?
Take your best profitable day, divide it by your total profit, and multiply by 100. If the result is above the firm limit, you are in breach. Most firms count only profitable days in the total and measure across the whole evaluation rather than a rolling window.
What does a 20% consistency rule mean?
Your best day may be at most 20% of total profit, so you need total profit of at least five times your best day. Make $1,000 on your strongest day and the account has to reach $5,000 in total profit before that day is compliant.
What does a 50% consistency rule mean?
Your best day may be at most half of total profit, so total profit needs to be at least twice your best day. It is the most forgiving version of the rule and is common on futures evaluations.
How do I lower my consistency score?
You cannot shrink a day that already happened, so the only path is adding profit on other days. The calculator gives you the exact figure: enter your best day and total profit and it returns how much more you need, plus a rough number of trading days at your current average. Trading smaller for a while is what fixes it, not trading bigger.
Do losing days count toward the consistency rule?
Usually not in the denominator. Most firms sum only profitable days when working out total profit, which means a losing day makes your best day a larger share, not a smaller one. Check your own firm rules, because a minority net losses against the total.
Can you fail a challenge after hitting the profit target?
Yes, and it is one of the most common ways evaluations are lost. Hitting the target and passing are separate tests. If your best day is too large a share of the total, the account stays in evaluation until you add enough profit on other days, even though the target is already met.
When is the consistency rule checked?
Most firms check it at the end of the evaluation and again at every payout request, which is why traders often find out about it late. Some also apply it to funded accounts permanently. Track it from the first trading day rather than discovering it at withdrawal.
Keep the rule in view while you trade
A calculator tells you where you stand today. The harder part is noticing the day that is about to become your problem, before it closes.
Watch the number instead of recalculating it
Log your trades and the journal keeps your consistency percentage live against your firm's limit, tells you the most you can make today without breaking it, and warns you before you get close. Free plan, no card required.
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