What is a prop firm consistency rule?

It limits how much of your profit can come from a single day. With a 40% rule, your best day can be at most 40% of your total profit (or of the profit target, at some firms).

How do I calculate my best-day percentage?

Divide your best day's profit by your total net profit and multiply by 100. A $1,200 best day on $2,800 total profit is 42.9%.

How do I fix a consistency rule breach?

Keep trading and build more total profit without beating your best day. You need total profit of at least best day ÷ consistency limit, for example $1,200 ÷ 0.40 = $3,000.

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Prop firm consistency rule calculator

Check whether your best day breaks your firm's consistency rule, and see exactly how much more profit you need to pass.

Your profits

Enter profits as

Daily P&L ($), one per line or comma-separatedUse net profit or loss for each trading day. Losing days count toward the total.

Best day profit ($)

Total net profit ($)

Firm rule

Consistency limit (%)Best day may be at most this share. Common: 30, 40, 50%.

Measured against

Profit target ($)

Best day share

Best day

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Total net profit

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Largest best day allowed

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Total profit needed to pass

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Extra profit still needed

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Estimates only. Firms calculate limits in slightly different ways (server time, equity vs balance, commissions). Always confirm against your firm's dashboard and rules page.

How to use the consistency rule calculator

Paste your daily profit and loss, one value per day, or switch to entering just your best day and total net profit. Then set your firm's consistency limit.

Most firms measure the best day against total profit. Some measure it against the profit target instead; choose that option and enter the target.

The formulas

Best-day share = best day ÷ total net profit × 100
You pass if best-day share ≤ the consistency limit
Total profit needed = best day ÷ consistency limit
Extra profit needed = total profit needed − current total profit

Worked example: 40% consistency rule

Five trading days of $1,200, −$300, $800, $500 and $600 give a total of $2,800. The best day, $1,200, is 42.9% of that, so a 40% rule is not met.

To pass, total profit must reach $1,200 ÷ 0.40 = $3,000, which is $200 more, made without a new best day above $1,200.

Common mistakes

Counting only winning days. Losing days reduce total net profit and raise your best-day share.
Making up the shortfall in one big day, which can become your new best day and move the goalposts.
Assuming every firm uses the same rule. Some apply it to the evaluation, some only to payouts, and some measure against the profit target.
Not checking the rule before your first payout request, when it matters most.

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