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Consistency Rule Calculator for Prop Firms

Check whether your best day is within your prop firm's consistency rule, how much more profit you need if it is not, and how much you can make tomorrow without breaking it.

Check from

Or pick a firm to fill in its rule.

%

Largest share one day may be. Often 30–50%.

All days added up; losing days shrink the total.

USD

Optional; shows what you really need.

7 days read: 1,200; -300; 800; 2,500; 600; -400; 900One result per trading day in USD, oldest first, on separate lines or split by spaces or semicolons. Losing days as negatives.

Consistency rule

Fails

Best day = 47.17% of net profit (limit 40%)

Best day

$2,500.00

Day 4 of 7

Net profit

$5,300.00

7 trading days

Extra profit needed

$950.00

At least 1 day of up to $2,500.00

Largest best day now

$2,120.00

40% of $5,300.00

To pass with one more day, tomorrow's profit must be between $950.00 and $3,533.33. Less leaves the share too high; more becomes a new best day that is too large.

Target with the rule

$6,250.00

Rule adds $1,250.00 to $5,000.00

Still to make

$950.00

No day above $2,500.00

Your trading days

  1. Day 1$1,200.00
  2. Day 2-$300.00
  3. Day 3$800.00
  4. Best, day 4$2,500.00
  5. Day 5$600.00
  6. Day 6-$400.00
  7. Day 7$900.00
Show the math
  1. Best daymax(daily results) = $2,500.00
  2. Net profit = sum of all days$5,300.00
  3. Best-day share = best day ÷ net profit$2,500.00 ÷ $5,300.00 = 47.17% > 40%
  4. Largest best day now = rule × total0.4 × $5,300.00 = $2,120.00
  5. Net profit needed = best day ÷ rule$2,500.00 ÷ 0.4 = $6,250.00; extra $6,250.00 − $5,300.00 = $950.00
  6. Largest next day that still passes = rule × total ÷ (1 − rule)0.4 × $5,300.00 ÷ 0.6 = $3,533.33
Embed this calculator

Quick answer

Best-day share = best day ÷ total profit, and you pass when it is at or below the rule, often 30–50%. To pass, total profit must reach best day ÷ rule. With $5,300 of net profit over seven days and a $2,500 best day, the share is 47.2%; under a 40% rule the total must reach $2,500 ÷ 0.40 = $6,250, which is $950 more, made on days no bigger than $2,500.

Worked examples: Risk management

What is the Consistency Rule Calculator for Prop Firms?

A consistency rule stops a challenge or payout from resting on one lucky day. It caps your best day as a share of your profit — commonly somewhere between 30% and 50%. This calculator takes your daily results, finds the best day, measures its share and tells you whether you pass, how much more profit you need, and what range of profit tomorrow keeps you inside the rule.

Best-day share = Best day ÷ Total profit
Pass when best-day share ≤ rule %
Total needed = Best day ÷ rule %

Because the best day stays fixed while the total grows, the fix for a failing record is usually more ordinary days, not a bigger one. With a $2,500 best day and a 40% rule, the total has to reach $2,500 ÷ 0.40 = $6,250.

What the best day is compared with

  • Total net profit — all days added up, so losing days shrink the total and make the rule harder to pass.
  • Profit of winning days only — losing days are left out of the denominator. Some firms describe this as "positive days' profit".
  • The profit target — no single day may exceed a share of the target, which works as a fixed daily cap.

What happens when you are over the limit also varies. Some firms simply ask you to keep trading until the ratio falls back under the cap; others hold a payout or fail the evaluation. The calculator shows the numbers; your firm's rulebook decides the consequence.

How to use this calculator

  1. Check from — Daily results to paste every day, or Best day to work from your best day and the profit so far.
  2. Firm rule — fills in an example firm's rule, or keep Custom rule.
  3. Best-day limit — the maximum share of profit your best day may represent, in %. 40% is filled in as an example.
  4. Share of — net profit, winning days only, or the profit target, depending on how your firm words the rule.
  5. Profit target — optional for the first two bases; with it you also see the net profit you really need to finish. Required when the rule is based on the target.
  6. Account currency — for display only.
  7. Daily profit and loss — paste one number per trading day, oldest first, on separate lines or separated by spaces, semicolons or commas. With one number per line, 1,250 is read as 1250; a list written with decimal commas (1250,50) keeps them as decimals. Enter losing days as negatives. Use your firm's daily figures (closed P&L per trading day as the firm defines it). The days read are listed under the box, so you can check them.

The result shows pass or fail with your best-day share, the best day, net profit and the extra profit needed, plus the range of profit tomorrow that passes. With a target you see the target, the net profit needed once the rule is taken into account and how much is still to make. Your days are listed with the best day highlighted. Show the math lists each step, and Copy link with these numbers saves your inputs.

Worked example

40% rule on net profit, $5,000 target. Seven days: +$1,200, −$300, +$800, +$2,500, +$600, −$400, +$900.

Net profit = $5,300 · Best day = $2,500
Share = $2,500 ÷ $5,300 = 47.2% → fails
Total needed = $2,500 ÷ 0.40 = $6,250 → $950 more

The $5,000 target is reached, but the rule effectively raises it to $6,250. Tomorrow any profit between $950 and $3,533.33 passes: below $950 the share stays above 40%; above $3,533.33 the new day becomes the best day and is itself more than 40% of the total ($3,533.33 ÷ $8,833.33 = 40%).

Same days, winning days only. The denominator is $6,000, so the share is 41.7% and only $250 more is needed; tomorrow anything from $250 to $4,000 passes.

30% rule, $3,000 best day, $8,000 total. The share is 37.5%. The total must reach $10,000, so $2,000 more is needed; a single day of $2,000 to $3,428.57 would do it.

When to use it

  • Before requesting a payout or passing a phase — confirm the ratio is within the rule so the request is not held back.
  • After a big day — see straight away how much ordinary profit you need to dilute it.
  • Planning the next session — know the most you can make tomorrow before a win turns into a problem.
  • Near the profit target — check whether the rule raises the profit you actually need to finish.
  • Setting a daily profit cap — on a target-based rule, the cap is simply the rule % times the target.

Common mistakes

  • Using the wrong denominator. 47.2% of net profit can be 41.7% of winning-day profit for the same days. Check which one your firm uses.
  • Forgetting that losing days lower the total. On a net-profit basis, a −$400 day raises your best-day share even though the best day did not change.
  • Trying to fix it with one huge day. A day bigger than the current best becomes the new best day. Above rule × total ÷ (1 − rule) it fails on its own.
  • Counting days differently from the firm. Firms define a trading day by their own reset time and usually by closed P&L. A trade held overnight can land in a different day than you expect.
  • Assuming the target is the finish line. With a big best day, the rule can require more profit than the target itself.
  • Over-trading to dilute. Extra days of small profit are the fix; forcing extra trades with larger size raises the risk of hitting the drawdown limit.

Frequently asked questions

What is the consistency rule in prop trading?

It is a limit on how much of your profit can come from a single day. Under a 40% rule, your best day must be no more than 40% of your total profit. Firms use it to make sure a challenge or payout reflects repeatable trading rather than one outsized day. The percentage, what the best day is compared with and the consequence of exceeding it vary between firms and programmes.

How do I calculate the consistency rule?

Divide your best day by your total profit and compare the result with the rule. A $2,500 best day out of $5,300 net profit is 47.2%, which fails a 40% rule and passes a 50% rule. Some firms divide by the profit of winning days only, or by the profit target, instead of net profit.

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

Your total has to reach best day ÷ rule. With a $2,500 best day and a 40% rule that is $6,250, so with $5,300 already made you need $950 more, made on days no bigger than $2,500. If a new day is bigger than the old best, it becomes the best day and the calculation starts again.

What is the most I can make in one day without breaking the rule?

If you currently pass, any day up to your current best is safe, and a bigger day is safe up to rule × total ÷ (1 − rule). With $5,300 of net profit and a 40% rule that is 0.4 × 5,300 ÷ 0.6 = $3,533.33. On a target-based rule the cap is simply rule × target: $4,000 for 40% of a $10,000 target.

Do losing days count in the consistency rule?

On a net-profit basis, yes: losing days reduce the total, which raises your best-day share. On a winning-days basis they are left out of the denominator. With days of +$1,200, −$300, +$800, +$2,500, +$600, −$400 and +$900, the best-day share is 47.2% of net profit but 41.7% of winning-day profit.

Does breaking the consistency rule fail the challenge?

At many firms it does not: you keep trading until enough profit is added for the best day to fall back within the limit, and a payout or phase pass waits until then. Other firms treat it as a hard rule. Check your firm's current rulebook for your exact programme.

Can I reach the profit target and still fail consistency?

Yes. With a $5,000 target, a $2,500 best day and a 40% rule, the total needs to be $6,250, so reaching $5,300 is not enough. The calculator shows this as the net profit needed to finish.

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