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Consistency Rule Calculator for Prop Firm Traders

Check whether your best day fits a consistency rule like 40% or 50%, and how much more profit you need if it does not.

Calculator published Oct 1, 2026 · Not financial advice

Check your consistency

Enter your profit as
The largest share of total profit one day may be, e.g. 40 or 50.

Net profit in the period the rule measures, after losing days.

Your single most profitable day in that period.

Not yet: best day is 50% of total profit (limit 40%)

Largest best day allowed at this total
$1,200
Total profit needed for this best day
$3,750
Additional profit needed
$750

The additional profit must come from days smaller than your best day; a new best day raises the target.

limit 40%50%0%100%

Not financial advice. Always check the firm's current rules: they change and differ by plan. Your numbers stay in your browser: nothing you type is saved or sent.

How the consistency check works

The most common form of the rule compares your best day with your total profit:

  1. Best-day share = best day ÷ total profit.
  2. You meet the rule when best day ≤ total profit × the limit (exactly at the limit counts as meeting it here).
  3. Total profit needed = best day ÷ the limit (for 40%: best day ÷ 0.40).
  4. Additional profit needed = total profit needed − your current total.

The extra profit has to come from days smaller than your best day. A bigger day becomes your new best day and raises the target.

Firms calculate this differently. Some measure the best day against the profit target instead of total profit, some apply the rule only in the evaluation or only before a payout, some reset it every payout cycle, and some say "less than" rather than "up to" the limit. Read your firm's rule before relying on the result: see consistency rules compared and the firm pages below.

Worked example

Your plan has a 40% consistency rule. You have made $3,000 in total and your best day was $1,500.

With a 50% rule the same numbers meet it: $1,500 is exactly 50% of $3,000.

Common mistakes

Consistency rule questions

What is a consistency rule in a prop firm?

A limit on how much of your profit can come from one trading day, usually written as a percentage such as 40% or 50%. It stops one outsized day from carrying an evaluation or a payout.

How do I calculate the consistency rule?

Divide your best day by your total profit. If the result is at or below the limit, you meet the rule. Example: $1,200 best day ÷ $3,000 total = 40%.

How much more profit do I need to meet the consistency rule?

Divide your best day by the limit to get the total you need, then subtract your current total. With a $1,500 best day and a 40% rule you need $3,750 in total: $750 more if you are at $3,000.

Do all prop firms calculate consistency the same way?

No. Some measure the best day against the profit target, some apply the rule only in the evaluation or only for payouts, and some plans have no consistency rule. Compare them on the consistency rules page and confirm on the firm's site.

Check your firm's rules

Which firms have a consistency rule, at what percentage and in which stage differs by firm and plan. Check the rule on your firm's page:

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