Trailing drawdown calculator for prop challenges
Where your floor sits now that it has followed your high-water mark, and how much room is left. The floor moves up with profit and never comes back down.
Room above the floor
$3700.00
Drawdown allowance$6000.00
Current floor$100400.00
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Tracks the high-water mark for you, so the floor is never a surprise.
What this covers
Trailing drawdown measured from the highest balance reached.
Both variants: a floor that trails forever, and one that locks once it reaches the starting balance.
Does not cover daily loss limits, which are a separate and usually tighter constraint.
Firms differ on whether the trail follows closed balance or peak equity including open profit. Check your agreement.
Formula and assumptions
Drawdown amount = starting balance × drawdown percentage.
Trailing floor = high-water mark − drawdown amount.
In locked mode, the floor never rises above the starting balance.
Room = current balance − floor.
Assumes the high-water mark you entered is the one the firm recorded, which may include intraday peaks you did not see.
trailing_drawdown.v1
Worked example
Example — check your own firm's rules.
Starting balance$100,000
Drawdown6% = $6,000
High-water mark$106,400
Trailing floor$100,400
Current balance$104,100
Room left$3,700
Common mistakes
Measuring the floor from the starting balance after the account has made profit.
Forgetting the floor rose during a session you did not watch — an intraday peak counts at many firms.
Assuming the floor drops back when you give profit back. It does not.
Treating a locked trail as a trailing one, or the reverse. They differ by thousands.
Limitations
This is arithmetic on numbers you supplied. It does not know your broker, your account, or the market. It does not predict price, does not say whether to take a trade, and is not advice. Maximelion is not affiliated with any broker or prop firm, and nothing here is endorsed by one.
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Last reviewed 25 July 2026