The 1–2 per cent risk rule

What this lesson explains and who it is for

This lesson explains how much you may lose on a single trade, how to turn that limit into a position size, and how to combine it with a daily loss limit. It is designed for someone who has already chosen an instrument and can point to an invalidation level, but does not know how to translate a percentage of capital into a concrete number of shares or contracts. The rule is a starting point, not a market law and not a promise of results.

Where the 1–2 per cent rule comes from

The 1–2 per cent rule is a practitioner convention, not a regulation or guarantee. Its purpose is simple: trading capital must last through learning and through the losing streak that every strategy will hit sooner or later. The standard regulator warning on CFD products, maintained since 2018, notes that a large share of retail accounts lose money. That is a standard disclosure every regulated broker must show. Its exact value depends on the broker and date, so check your broker for the current percentage and record it with the date of reading.

The scale of the problem is too large to blame on one cause, but in practice three patterns repeat: unlimited leverage, no per-trade loss limit, and no daily limit. The rule exists as a survival frame — capital must survive the period while you are learning the process. Read regulator communications from ESMA and KNF.

Protocol: calculate 1R and position size in five steps

Position size is the result, not the starting point. Calculate it like this, or plug the numbers into a position size calculator:

1R (risk budget) = trading capital x percent risk per trade
position size    = 1R / (entry-to-stop distance x value of one unit)

1. Set trading capital. This is the amount allocated to trading, not all savings. Losing it must not change your life plans.
2. Set the risk as a percentage. A starting point is 1 per cent, with 2 per cent as the usual upper bound. Capital multiplied by this per cent gives 1R, the amount in account currency you lose if the stop is hit.
3. Measure the distance from entry to stop in instrument price terms: pips, points, or currency per unit. The distance comes from the setup invalidation, not from how close the protective order can be placed.
4. Set the value of one position unit in account currency. On CFDs and FX, convert pips or points to account currency; on stocks, calculate currency per share multiplied by share count.
5. Divide 1R by distance multiplied by unit value. The result is the position size at which the loss on stop equals exactly 1R.

All values in the illustrative column are illustrative numbers; the point conversion and required deposit depend on the symbol — check them with your broker. If the required deposit exceeds free funds, you reduce position size — you do not increase leverage. Without this step, a “small stop” with a large position is still enormous R.

Daily limit — how many trades fit into the budget

A daily limit expressed as a percentage is useless until you know how many trades fit inside it:

trades_to_limit = daily_limit_percent / risk_per_trade_percent

At 1 per cent risk per trade and a 2 per cent daily limit, two trades fit, and the third is outside the rule even if it is the best setup of the week. At 0.5 per cent risk, the same limit allows four entries. The values in the table are illustrative and describe structure, not a recommendation of a specific threshold.

After hitting the limit, you end the session and return to your journal. Enforce the limit with tools — a notification and closing the platform — because an internal “I will hold back this time” loses under stress. The full procedure, including pause thresholds after a drawdown, is described in the lesson Daily limit and drawdown.

When the rule says do not trade

1. You do not know the stop distance. Without an invalidation level you cannot calculate position size, so every size decision would be guessing.
2. You have exhausted today’s trade budget. The counter in the table above is absolute, not almost absolute.
3. You are tightening the stop to fit a larger position. That reverses the logic: stop distance comes from the chart, and position size comes from the stop, never the reverse.
4. You increase risk after a series of losses to make back money. After a drawdown, position size moves down until the journal shows a return to plan-compliant process.

Why 1 per cent survives a losing streak

A losing streak is not an anomaly. With a win rate around 40–50 per cent, six losses in a row is ordinary sample mathematics, not bad luck. The table below is a simplified illustration without compounding; it shows why per-trade risk size decides whether capital and mindset survive a bad week.

Scenario A preserves capital and the mental state needed to collect more data. Scenario C usually ends in revenge trades or additional deposits under pressure. That is why the rule is a survival frame, not a profit method.

Common mistakes when calculating 1R

• Calculating a percentage from the broker’s maximum leverage instead of from the stop distance. Leverage tells you what exposure you can open, not how much you may lose.
• Increasing position size after a series of wins because you think you have improved. A few successful trades is too small a sample to change the rules.
• Treating 1–2 per cent as a rigid constant regardless of setup. With a new, untested setup, 0.5 per cent may be more sensible than full 1 per cent.
• Ignoring correlations. Two positions on related instruments are practically one larger risk, not two independent 1R trades.
• Forgetting currency conversion. An instrument quoted in USD or EUR on an account in USD requires the exchange rate to be included when calculating real loss.
• Confusing the rule with a money-making method. The lesson on expectancy and drawdown explains how to measure edge. The rule also does not replace costs: spread and the withholding tax reduce results regardless of how well you calculate 1R.

Measurable exercise

For your instrument, calculate position size at a medium stop and a wide stop so that 1R equals 1 per cent of hypothetical 10,000 account currency. Record the formula and both sizes in your playbook, then compare them with what the leverage slider on the platform suggests — the difference is often large. Add a daily limit in R and the number of trades that fit inside it, plus a phone notification at that limit. Over the next 10 sessions track two facts: whether position size was calculated from the formula and whether the limit was exceeded. Without execution, the rule is only a quote from an article.

Common questions

Is 2 percent per trade appropriate for a beginner?

It is often too aggressive to start on a live account. 1 percent or 0.5 percent gives more room for process mistakes. You come back to 2 percent once you have a collected sample of trades and a calm drawdown.

Should 1 percent be calculated from equity or from the initial deposit?

From the current trading capital, i.e. equity, and consistently from the same base. After a 1R loss the risk amount for the next trade also falls — that is intentional and protects the account.

How does the rule combine with CFD leverage?

Leverage determines what exposure you will open at a given deposit. The rule says how much you may lose to the stop. The order is fixed: first you calculate 1R and position size, and only then do you check whether free funds cover the deposit.

Why measure 1R in USD instead of counting percentages in your head?

Because a percentage does not say how much money is on the table. Only an amount in USD lets you compare the risk of a trade with your monthly budget, check the required deposit, and notice the moment when position size stopped following from the stop. Measurement turns the rule into a number you can verify after the fact — and that is exactly what separates a process from an impression.