Risk Per Trade: The 1 Percent Rule and Why It Holds
Macro Glossary, Orders and Risk
Quick answer
Investopedia 1% Rule Trading Risk Per Trade: the short answer from the KenMacro desk. Risk per trade is the percentage of account balance lost if a stop hits. The conventional 1 percent rule keeps a strategy alive through any normal losing streak.
By Ken Chigbo, macro trader and founder of KenMacro, 18+ years in markets.
Updated 2026-05-20
The desk’s answer
Risk per trade is the percentage of total account equity that would be lost if the position’s stop loss is hit at the planned level. The conventional rule is 1 percent per trade, with a range of 0.5 to 2 percent considered sane. At 1 percent risk, a trader can lose 10 consecutive trades and still have 90 percent of starting capital (90.4 percent compounded), well within recoverable territory. At 5 percent risk, the same 10-loss streak leaves 60 percent, requiring a 67-percent recovery to break even, which most strategies cannot deliver. Risk per trade is therefore the single most important sizing variable for long-term survival.
Defined term, Risk per trade
Risk per trade is the percentage of total account equity that is lost if a position’s stop loss is hit at the planned level. It is the primary input to position sizing and the variable that determines how long an account survives a losing streak. The conventional 1 percent rule (or 0.5 to 2 percent) is the empirical floor below which strategy variance cannot end the account.
How risk per trade is calculated
Risk per trade = (1R in dollars) / (account equity) times 100, where 1R is the absolute dollar distance from entry to stop loss multiplied by position size. On a 10,000 dollar account with a planned 50-pip stop on EUR/USD at 1 standard lot (50 pips times 10 dollars per pip = 500 dollars), risk per trade is 5 percent. To bring this to a target of 1 percent risk per trade, the position is reduced to 0.2 standard lots (2 mini lots), making 1R equal to 100 dollars. Sizing is therefore done backwards from the target risk percentage and the stop distance, not forwards from the position size the trader wants to take.
Why the 1 percent rule holds
Two reasons. First, drawdown math: at 1 percent risk per trade, the account drawdown from a 10-trade losing streak is 9.6 percent (compounded), 20 trades is 18.2 percent. Both are recoverable through a normal positive expectancy strategy within a few months. At 5 percent risk, the same 20-trade streak leaves 64 percent of capital, requiring a 56-percent recovery, which is not realistic on most strategies. Second, psychological math: 1-percent losses do not trigger the revenge-trade or risk-off reactions that 5-percent losses do, so the trader’s process remains intact through the inevitable drawdown periods. Survival is not about avoiding losing streaks; it is about sizing so the streak is recoverable and the process survives it.
When to deviate from 1 percent
Three common adjustments. First, scaling down to 0.5 percent or lower during a drawdown phase: when the account has lost 10 to 15 percent, halving the risk per trade prevents the drawdown from accelerating beyond recoverable territory. Second, scaling up to 1.5 or 2 percent on the highest-conviction setups within a tested strategy: when win-rate on this specific signal type is documented at 60 percent or higher with average wins of 2R or more, the higher risk is justified by edge. Third, sub-1-percent on event days: NFP, FOMC and CPI introduce gap and slippage risk that can turn a planned 1R into 1.5R; cutting risk per trade to 0.5 percent on these days preserves the average across the rolling sample. Discretion is allowed; chronic over-risking is not.
Frequently asked
What is the 1 percent rule in trading?
Risk no more than 1 percent of total account equity on any single trade, calculated as the planned dollar loss if the stop loss is hit at its requested level. The rule ensures that any normal losing streak (10 to 20 consecutive losses) leaves the account within recoverable territory.
Why 1 percent and not 5 percent?
Because at 5 percent risk per trade, a 20-trade losing streak (which happens on most strategies over a year) leaves the account at 64 percent of starting balance, requiring a 56-percent recovery that is not realistic. At 1 percent the same streak leaves 82 percent, recoverable through a normal positive expectancy run within months.
When should I scale risk per trade up or down?
Scale down to 0.5 percent during a drawdown of 10 percent or more to prevent acceleration. Scale up to 1.5 to 2 percent only on the highest-conviction setups with documented strategy edge. Cut to 0.5 percent on high-event days (NFP, FOMC, CPI) where slippage can inflate the planned 1R.
What this means at the desk
Risk per trade is the single most important sizing variable. The 1 percent rule is empirically the safe floor.
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