Max drawdown is the largest peak-to-trough decline in your account value before it reaches a new high. It grows through the combination of how much you risk per trade, how many losses arrive in sequence, and whether you exit when your original invalidation price is reached.
Educational content, not financial advice.
Start with the percentage, then convert it to dollars
A drawdown percentage makes losses comparable across account sizes. If a $10,000 account falls to $9,200, the drawdown is 8 percent. The dollar loss is $800.
Calculate it this way:
`(account peak - account low) / account peak × 100`
The starting peak matters. A 10 percent drawdown requires an 11.1 percent gain to recover. A 25 percent drawdown requires a 33.3 percent gain. At a 50 percent drawdown, the account must double from its low to return to the prior peak.
That is why a loss limit is an operating constraint, not a prediction about the next trade.
Position size determines how fast losses compound
Before entering a trade, define three numbers: entry price, invalidation price, and maximum dollar risk. Position size follows from those figures.
Suppose a $10,000 account has a 1 percent risk limit, or $100, for one trade. A stock entry is $50 and the planned exit is $48. The risk per share is $2, so the maximum position is 50 shares:
`$100 maximum risk / $2 risk per share = 50 shares`
If the exit occurs at $48, the planned loss is $100 before commissions, fees, slippage, or gaps.
Now compare that with buying 200 shares. The same $2 move creates a $400 loss, or 4 percent of the account. The chart did not change. The account-level consequence did.
A stop-loss order can fill worse than its trigger price during a fast move, especially in thinly traded stocks or crypto markets. Size positions with room for that possibility. A trader who treats a $100 planned loss as a guaranteed $100 result is understating risk.
For a closer look at connecting an invalidation price to share count, see Trade Invalidation Price: How Leon Sized Risk Before Entry.
Consecutive losses test the plan before they test the strategy
Losses do not arrive on a polite schedule. Five losses in a row can occur in a method that also has profitable periods. Your position sizing determines whether that sequence is manageable.
With a fixed 1 percent risk limit, a $10,000 account that takes five full planned losses falls approximately as follows:
- After one loss: $9,900
- After three losses: about $9,703
- After five losses: about $9,510
The drawdown is about 4.9 percent, slightly less than $500 because each 1 percent risk amount declines with the account.
With a fixed $100 risk amount, five full losses produce a $500 decline, also a 5 percent drawdown. Both approaches can be reasonable. Percentage risk automatically reduces exposure as the account drops. Fixed-dollar risk is simpler to track, but it becomes a larger percentage of a shrinking account.
The tradeoff is practical. A smaller risk limit can make recovery requirements more manageable, while it may also require fewer shares, smaller crypto size, or trades with a tighter and more realistic invalidation level. Do not tighten a stop merely to make a position larger. A stop belongs where the trade idea is invalidated, then size must fit the risk limit.
Stop-loss discipline keeps one loss from changing the math
A stop is useful only if the order or exit decision is followed. Moving it farther away after entry changes the original risk calculation.
Return to the $50 stock entry and $48 exit. At 50 shares, the planned risk is $100. If price reaches $48 and the trader holds while hoping for a rebound, a move to $45 turns the loss into $250. One decision has used 2.5 times the original risk budget.
This is where drawdown often accelerates. The trader has less capital, may feel pressure to recover quickly, and may increase position size or loosen another exit rule. That sequence turns several ordinary losses into a deeper account decline.
A planned exit can still result in a loss. Its job is to define the loss you were willing to accept before uncertainty and emotion changed the decision. What Happens When a Losing Trade Followed Your Original Exit Rule? examines that distinction in practice.
Set a drawdown response before the next trade
Choose a review threshold that changes your behavior. For example, a trader might pause new entries after a 5 percent account drawdown, review every completed trade, and resume only after confirming that position size, entries, and exits matched the written plan. The 5 percent figure is an illustration, not a universal rule.
Record these fields for your next 20 trades: account value at entry, dollar risk, percentage risk, planned exit, actual exit, and whether the exit rule changed after entry. Then calculate the largest peak-to-trough decline during that sample.
The useful result is not a promised recovery path. It is a record of how your sizing and exit decisions behave when losses cluster.
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