The 2% rule is a position-sizing convention: plan a trade's loss budget as 2% of a defined account value. It is not evidence that most traders use that number, that it suits your account, or that actual losses cannot exceed it.

What the Arithmetic Shows

If each losing trade removes exactly 2% of the remaining account, ten consecutive losses leave 0.98^10, approximately 81.71%, of the starting value. That is an 18.29% decline and requires about 22.39% growth from the reduced balance to recover. At 10% per loss, ten losses leave 34.87%, requiring about 186.80% growth.

These are simplified calculations with no additional costs or deposits. They do not estimate the probability of a losing streak or promise recovery. Lower sizing reduces loss amounts for a given sequence; it does not turn negative expectancy positive.

Planned Risk Is Different From Actual Loss

On a $10,000 account, a 2% illustrative budget is $200. An entry at $50 and stop trigger at $48 gives $2 price distance. Dividing $200 by $2 yields 100 shares before costs and execution allowance. That quantity already consumes the entire budget, so it leaves no room for fees or an adverse fill.

A stop order can execute beyond its trigger. Determine the quantity after allowing for costs and uncertainty, round down to permitted increments, and avoid calling the resulting figure a guaranteed maximum loss.

Define the Account Value and Shared Budget

Starting balance, current cash balance and equity including open positions are different inputs. Specify which you use. Open positions already consume risk capacity, and several correlated trades can lose together.

An evaluation's advertised account size may be simulated buying power with a much smaller permitted drawdown. Applying 2% to that nominal figure can consume a large share of the remaining allowance. Use the exact programme's current loss formula and your own stricter budget where applicable.

There Is No Mandatory Percentage

The amount depends on the strategy's uncertainty, total exposure, minimum contract size, execution risks and money you can afford to lose. A lower number—or no live trade—can be appropriate. A subjective “A+ setup” label does not justify increasing exposure without evidence and an agreed rule.

Our position-sizing guide develops quantity and unit-value calculations. Treat a percentage as an input to that process, not a certification that a trade is safe.

Risk Disclaimer: Trading involves substantial risk of loss. Past performance is not indicative of future results. See our full risk disclaimer.