The 1% Rule in Trading: How Much to Risk Per Trade

At a glance

Risk per trade

1% of the account

On a $5,000 account

$50 per trade

Lot size

From the stop distance

Realised loss

Can exceed 1% (gaps, slippage)

What is the 1% rule in trading?

The 1% rule is a risk guideline: the planned loss on any single trade, the amount lost if the stop loss is hit, is limited to 1% of the trading account. On a $5,000 account that is $50 per trade. It is one of several fixed-percentage approaches, which may use limits such as 0.5%, 1% or 2%. The idea behind all of them is the same: keeping the loss from any single trade small relative to the account, so that a series of losses does not reduce it too quickly.

The rule concerns risk, not position value. A trade risking 1% of the account can involve a position worth many times the account balance, depending on the stop distance and leverage.

How to apply the 1% rule in trading

Applying it takes three steps:

1. Calculate 1% of the account: for example, $5,000 × 1% = $50.
2. Set the stop loss. A common approach is to set the stop near the level where the setup would be considered invalid, then measure the distance in pips: stop loss.
3. Calculate the position size so that the stop distance multiplied by the pip value equals the 1% amount: position sizing.

lots = (account × 1%) ÷ (stop distance in pips × pip value per standard lot)

1% rule example: EUR/USD

Assumptions: account $5,000, EUR/USD on a USD account, pip value $10 per standard lot, 25-pip stop loss.

1. Risk amount: $5,000 × 1% = $50
2. Position size: 50 ÷ (25 × 10) = 0.20 lots

If the stop is hit, the loss is about $50 before spread, commission and slippage.

Why is the 1% not the position size?

Because the position size depends on the stop distance. With the same $50 risk, a tighter stop allows a larger position:

Same 1% risk, different stop distances

Assumptions: account $5,000, risk $50, EUR/USD at 1.0850, pip value $10 per standard lot.

• 50-pip stop: 50 ÷ (50 × 10) = 0.10 lots, a position of about $10,850 (effective leverage about 2.2:1)
• 5-pip stop: 50 ÷ (5 × 10) = 1.00 lot, a position of about $108,500 (effective leverage about 21.7:1)

Both trades risk 1% before costs if the stop is filled at its level. The second requires much more margin, and a given amount of slippage represents a larger fraction of its planned stop distance: leverage.

Should the 1% be based on the starting or the current balance?

Both methods exist, but they produce different risk paths during gains and drawdowns. Recalculating the 1 percent rule amount from the current balance after every trade, often called fixed fractional position sizing, makes the risk amount shrink during a drawdown and grow after gains. Keeping it fixed to the starting balance keeps the dollar risk constant, so each loss during a drawdown is a larger share of the remaining account.

Recalculating 1% after losses

Starting balance $5,000, three losing trades at 1% of the current balance:

• Trade 1: risk $50.00, balance afterwards $4,950.00
• Trade 2: risk $49.50, balance afterwards $4,900.50
• Trade 3: risk $49.01, balance afterwards $4,851.50

What are the limits of the 1% rule?

• It does not create an edge. Risking 1% per trade controls how fast losses accumulate; whether a strategy makes money depends on its win rate, average win, average loss and costs: risk-reward ratio.
• The realised loss can exceed 1%. A standard stop loss does not guarantee the exit price: gaps, slippage and execution beyond the intended stop can cause the realised loss to exceed 1%, and spread widening can also trigger the stop sooner.
• Correlated positions can create combined risk. Several open positions that each risk 1% can move together, for example trades in different pairs that share the US dollar, so the combined risk can be well above 1%. Correlation between pairs is not constant, so this overlap changes over time. A separate portfolio-level risk cap can be used to limit combined open risk.
• Prop firm loss limits work on a different basis. Daily and maximum drawdown limits are measured against the account’s starting or peak value, so the number of 1% losses an account can absorb is fixed in advance: prop firm drawdown rules.
• Minimum lot size can limit the 1% rule. If the broker’s minimum position is 0.01 lots, the smallest risk on EUR/USD with a 25-pip stop is about $2.50 (USD account). On a $200 account, 1% is $2, so even the smallest possible position would risk about 1.25%. The trader may then need to accept a higher percentage risk, use a different instrument or account structure, or not take the trade.

The position size calculator works out the lot size from the risk percentage, stop distance and pair, so the 1% risk rule can be applied to any trade.