Prop Firm Trailing Drawdown Calculator

The same account under all three rules

One set of numbers, three rulebooks. This is the table to check before you buy a challenge — the identical account can have three times the room under a static rule that it has under intraday trailing.

What size survives a normal day?

Your binding buffer divided by the adverse move you must survive. The probability column treats a daily return as normally distributed with the σ you entered — a rough model, deliberately optimistic, because crypto returns have fatter tails than the normal curve. If a number here already looks uncomfortable, reality is worse.

Which limit actually kills challenges

Most traders size to the headline drawdown number and never check the daily loss cap, which on a typical crypto programme sits at half the total allowance and therefore binds first on almost every day of the challenge. Work the pass/fail arithmetic of the whole challenge with the prop firm challenge calculator, size individual trades against the binding buffer using the position size calculator, and check what a drawdown costs you in recovery time with the drawdown recovery time calculator.

The rule that punishes you for winning

Every drawdown calculator on the internet gives you one number: starting balance minus allowance. That number is right for exactly one of the three rule types in circulation, and it is the one the fewest crypto and futures programmes actually use. Under a static drawdown, yes — a $50,000 account with a $2,500 allowance fails at $47,500 forever, and every dollar you make is a permanent dollar of extra room. Under a trailing rule the line chases you. Make $1,600 and your fail line is no longer $47,500; it is $49,100. You have the same $2,500 of room you started with, except now you are risking money you already earned to keep it.

The split between end-of-day and intraday trailing is where accounts die quietly. An EOD rule only looks at your closing balance, so a trade that runs $2,000 in your favour at 14:00 and gives it all back by 17:00 leaves the floor untouched — you closed flat, the high-water mark did not move. An intraday rule reads live equity, unrealised profit included. That same round trip permanently raises your fail line by $2,000 and hands you nothing in return. You end the day flat on the statement and $2,000 closer to failing. Traders who scale out of runners, or who hold through a spike and exit on the retrace, breach intraday accounts on green days without ever understanding what happened. If your firm uses intraday trailing, the correct behaviour changes: you take profit into strength rather than trailing a stop, because under this rule an unrealised gain you do not bank is a liability.

The second half of this page is the part no prop-firm calculator does, and it matters more in crypto than anywhere else. A $2,500 allowance on $50,000 is 5%. Bitcoin's daily σ has spent most of 2026 somewhere around 2.5–3.5%; a mid-cap altcoin perp is routinely double that. Carry $40,000 of notional against a $1,400 binding buffer and the move that fails you is 3.5% — inside one standard deviation. The table above turns that into a probability, and a one-day figure of even 15% compounds into near-certainty across a twenty-day challenge. That is the honest answer to "is this challenge passable at this size", and it is almost always no at the size people actually trade.