Prop Firm Drawdown Calculator

Funded-trader programmes and challenges end the moment equity touches one of two levels: the daily loss limit and the maximum loss limit (also called max drawdown). This calculator turns your firm's rules and your account numbers into those two breach levels, the money left before each one, and which of them you would hit first.

Room left = Current equity − Breach level
Daily breach level = Start-of-day balance (or equity) − Daily loss allowed
Static floor = Starting balance − Maximum loss
Trailing floor = Highest balance or equity − Maximum loss (optionally capped at a lock level)

The limit that binds is the one with less room. Early in a good day the daily limit usually binds; after a run of losses the maximum loss floor can be closer.

Static and trailing maximum loss

A static limit never moves: on a $100,000 account with a 10% limit the floor is $90,000 whatever happens. A trailing limit follows your high-water mark upwards and never comes back down, so profit you give back is lost room. Firms trail different things:

• Intraday (equity) trailing — follows the highest equity reached, including open profit. A trade that runs to +$1,500 and is closed at +$400 still lifts the floor by $1,500.
• Balance trailing — follows the highest closed balance, so open profit you never bank does not move it.
• End-of-day trailing — follows the highest balance at the daily close; the floor only moves once a day.

Many trailing rules stop trailing once the floor reaches the starting balance (sometimes the starting balance plus a small buffer). From then on the floor is fixed and every extra dollar of profit is extra room.

Daily loss limit

The daily limit is usually a fixed amount — often a percentage of the initial account size — subtracted from the balance or equity at the daily reset. Even when it is measured from the start-of-day balance, breaches are normally checked against live equity, so a floating loss on an open trade counts.

1. Rule preset — pick the shape closest to your account (2-step static, 1-step end-of-day trailing, intraday trailing that locks, futures-style dollar drawdowns) or Custom rules. Presets are generic examples; check the figures against your firm's current rulebook.
2. Account currency and Account size — the starting balance of the challenge or funded account.
3. Current balance and Current equity — balance counts closed trades only; equity adds open profit or loss.
4. Highest equity / Highest balance / Highest EOD balance — shown for trailing limits. Enter the peak your rule trails; leave it empty if the account never rose above its start.
5. Loss rules — open this section to set Limits set as (percent of the account or a fixed amount), the Maximum loss type, Maximum loss and, for trailing limits, where Trailing stops at.
6. Daily loss limit — leave empty if there is none. Choose whether it is measured from the start-of-day balance, equity or the higher of the two, whether a percentage is of the account size or of the start-of-day value, and enter today's starting balance (and equity if needed).

The result shows the room before the binding limit with the equity level at which it breaches, the room left today and overall, and a bar for each limit. Under Next trade size, choose the instrument and stop loss and, under Costs, open risk and contract specs, optionally the commission, the risk already open and the lot step: you get the largest lot size whose stop-out stays inside the room. Show the math lists every step with your numbers, and Copy link with these numbers saves the inputs.