Consistency rule calculator for prop firm evaluations

On a standard Fullport evaluation, no single UTC day's realized profit may be more than 55% of your total realized profit at the moment you pass. Written as the engine checks it:

• Total = the sum of every day's realized P&L, losing days included.
• Best day = the largest single profitable day. A losing day can never be the best day.
• Pass condition: best day ≤ 0.55 × total, and total ≥ the profit target (+6% of the starting balance). The total has to be positive.

The comparison is exact: 55.0% passes and 55.1% does not. Only realized profit counts — an open position contributes nothing until it is closed — and the account has to be flat when the pass is checked. The full text is in the rulebook; the consistency rule explainer covers why firms use the rule at all. This page is the arithmetic for planning around it.

A day bigger than 55% of the target is fine: it simply raises the total you need. Rearranging the pass condition, the total required is best day ÷ 0.55, and the extra profit needed is that minus what you already have:

The extra profit must come on days that are each no bigger than the current best day, or the new day becomes the best day and the bar moves again. That is why the calculator reports a range for the next day, not just a minimum.

Suppose your days so far sum to T with a best day B, and tomorrow makes X. Tomorrow passes the rule if the larger of B and X is at most 55% of T + X. Solving both cases gives a window:

• Lower bound: X ≥ B ÷ 0.55 − T (enough to dilute the old best day), and X ≥ whatever is still missing from the target.
• Upper bound: X ≤ T × 55 ÷ 45, about 1.22 × T. Above that, X is the new best day and is itself more than 55% of the new total.
• If the dilution amount alone (B ÷ 0.55 − T) is bigger than B, or the lower bound ends up above the upper bound, no single day can do it: you need at least two more profitable days.

The calculator's default input is the rulebook's own example: +$1,000 then +$500 on a $25,000 account. The target is met, but $1,000 is 66.7% of $1,500. The window for day 3 is $318.19 to $1,833.33. The rulebook's day 3 of +$400 lands inside it: $1,000 is 52.6% of $1,900, and the evaluation passes. A day 3 of +$2,000 would not, because $2,000 is 57.1% of $3,500.

Down days shift the math too: they lower the total, which raises the best day's share. With +$1,000, +$600, −$200 and +$400 the total is $1,800 and the best day is 55.6% of it, so one more green day finishes it. The window for the next day starts at just $18.19, and runs to $2,200.

• Know your day cap before you trade. On the $25,000 account, a day above $825 is only a problem if you planned to finish at exactly $1,500. Use the calculator to see what it costs you.
• Close positions to bank a day. Realized profit is booked to the UTC day the trade closes in; an open winner carried past 00:00 UTC lands on the next day.
• Keep the floor in view. The 4% drawdown floor applies on every tick, so add the extra days at your normal size rather than forcing them — the drawdown calculator shows how much room you have.
• If your edge is one big day, pick the 1-Day Pass at checkout. Same fee, a +8% target ($2,000 on the $25,000 account) and no consistency rule. A +$2,000 first day finishes it outright; on a standard evaluation the same day leaves $1,636.36 still to make.

None of this follows you into the funded account: funded payouts are never checked for consistency (payouts). What a funded account pays is a separate calculation, covered by the payout calculator.