ARMFRisk on a single trade
Risk per trade is the share of the account you lose when the stop is hit. The figure is chosen once and does not depend on your confidence in a particular trade: confidence cannot be measured, while a losing streak can. We take apart where the familiar percentages came from and how to test your own.
What risk per trade is and how to calculate it
The formula is elementary: money risk = equity × risk percentage. Two details matter, and they are the ones most often got wrong.
- It is counted from current equity rather than from the starting deposit
- After a drawdown of 20 % the same 1 % is already a smaller amount in money. It is exactly this property that stops the account reaching zero mechanically.
- It is counted before the entry, not after
- First the money risk, then the stop level, then the size. The reverse order — «took a lot, put the stop a bit closer» — gives an arbitrary percentage.
- It does not depend on the «quality» of the signal
- Raising the risk on a «very good» trade destroys the statistics: a losing streak will land precisely on the increased sizes, because confidence and outcome are unrelated.
The 1 percent rule in trading: where it comes from and what it means
The rule «do not risk more than one percent of the account per trade» came from the practice of fund managers and professional traders, where the key task is not maximum return but the survival of the system over a long distance. The point is that at such a risk no realistic losing streak takes the account beyond the point of no return.
This is checked by arithmetic rather than by faith. At a share of 1.5 % with recalculation from current equity, ten stops in a row give a hole of 14.0 %, twenty give 26.1 %; climbing out of it costs 35.3 % of growth. Raise the share to 4 %, and the same twenty stops take away 55.8 %, while the recovery already requires 126.2 % — that is, the account has to be more than doubled.
| Stops in a row | A share of 0.75 % | A share of 1.5 % | A share of 2.5 % | A share of 4 % |
|---|---|---|---|---|
| 5 | −3.7 % | −7.3 % | −11.9 % | −18.5 % |
| 10 | −7.3 % | −14.0 % | −22.4 % | −33.5 % |
| 15 | −10.7 % | −20.3 % | −31.6 % | −45.8 % |
| 20 | −14.0 % | −26.1 % | −39.7 % | −55.8 % |
| 30 | −20.2 % | −36.5 % | −53.2 % | −70.6 % |
The holes compound: each next stop is counted from an already reduced account. That is why 20 stops of 5 % give not 100 % but 64.2 % — the account is not mathematically zeroed, but it leaves the zone of realistic recovery.
Why «up to 5 % per trade» is a poor reference for a beginner
The figure of 5 % appears in popular manuals and sounds moderate: «no more than a twentieth of the account». The problem is not the number itself but the fact that it is not related to the length of a losing streak of a particular system.
At a win rate of 45 % — typical for trend strategies with a ratio of 1 : 2 — six consecutive losses over a stretch of 200 entries occur with a probability of about 93 %. That is not a rare event but an almost obligatory one. At 5 % risk such a streak takes away 26.5 % of the account, and the recovery requires 36 % of growth. At 1 % risk the same streak costs 5.9 %, and the recovery requires 6.2 %.
How to test your percentage in five minutes
The check requires no probability calculations — only your own trade history.
From the journal over the last 100–200 trades. If there is no history, take a reference from the win rate: at 50 % it is five or six in a row, at 40 % seven or eight.
from the journalThe past maximum will almost certainly be exceeded: the longer the distance, the longer the expected streak. The buffer is needed exactly for that.
a buffer for the futureMultiply: at a risk of r and a streak of n the drawdown is 1 − (1 − r)ⁿ. For 1 % and nine stops that is 8.6 %.
one formulaIf the result goes beyond 20 %, the risk percentage is too high for your system. Not «I will be lucky», but too high: the streak will come.
a limit of 10–20 %Three ways to set the risk on a currency account
«One percent» is the most common but not the only way to define the risk amount. Three approaches differ in what the value is taken from, and each has its own area of use.
| Method | How it is calculated | Plus | Minus |
|---|---|---|---|
| A fixed fraction of equity | Equity × the percentage. The amount changes with the account | Automatically reduces the risk in a drawdown | On a small account it runs into the minimum lot |
| A fixed amount | A fixed money amount for every trade | Simpler to calculate and control | In a drawdown the share of risk grows, as the account grows it falls |
| Risk by volatility | A share of equity divided by the instrument's ATR | Equalises trades across different pairs | Requires recalculating ATR and understanding its horizon |
The practical choice is almost always the first method: it is the only one whose drawdown is limited mathematically. The second is acceptable over short test stretches. The third is useful when the portfolio holds pairs of different mobility — otherwise the calm EUR/USD and the lively GBP/JPY give a different frequency of stop triggers at the same percentage.
How this looks in money. An account of $5,000, risk of 1 %. A fixed fraction gives $50 now and $40 after a 20 % drawdown. A fixed amount leaves $50 in both cases — that is, after the drawdown it is already 1.25 % of the account. The difference looks small, but it is exactly what separates a fading drawdown from an accelerating one.
Risk in percent and risk in R: two notations of one number
In trade journals the result is often recorded not in money but in R — units of the initial risk. A trade closed at the stop gives −1R; a trade that travelled twice the distance to the target gives +2R. The convenience is that such a record depends neither on the size of the account nor on the risk percentage.
The conversion is simple: at a risk of 1 % of the account, 1R = 1 % of equity. A result of «+14R for the month» means +14 % on the account at an unchanged risk percentage — and exactly +7 % at a risk of 0.5 %. That is why it is more convenient to keep the statistics of a system in R and to decide the risk percentage separately.
The practical consequence. Changing the risk percentage does not change the quality of the system — it scales the result in both directions. If a system gives +20R a year, doubling the risk will double the drawdown too. That is why the question «which percentage to choose» is decided through the acceptable drawdown rather than through the desired return.
Frequently asked questions
How do you calculate the risk per trade in money?
Multiply the current account size by the chosen percentage. With an account of $3,000 and a risk of 1 % that is $30. Then the amount is divided by the stop distance and the pip value — which gives the size in lots.
Can different percentages be risked on different trades?
Technically yes, but then the statistics of the system stop being comparable: a result in R no longer converts into percentages of the account by a single coefficient. Besides, the increased risk is usually placed on the «obvious» trades, and statistically they are no better than the rest.
What to do if the minimum lot gives a larger risk than planned?
Three honest options: choose an instrument where a pip costs less, take a trade with a shorter stop or increase the deposit. The dishonest option is to raise the risk percentage just this once: that turns a rule into a wish.
Should the risk be reduced during a drawdown?
Under a fixed fraction of equity it reduces itself: 1 % of a reduced account is a smaller amount. An additional manual reduction makes sense as part of the stopping rules: for example, half size after the drawdown limit is reached, until the statistics recover.
How many trades a day can be opened at 1 % risk?
The limit is set not by a number but by the daily loss cap. If the cap is 3 % and the risk is 1 %, three stops in a row close the trading day regardless of how many trades were planned. More on this in the article on the daily limit.
How much is that in money on a deposit of 1,000 dollars?
A risk of 1 % is $10 per trade. With a stop of 25 pips and a pip value of $10 per standard lot the size comes out at 0.04 lot: 10 ÷ (25 × 10) = 0.04. With a stop of 50 pips the size is half that — 0.02 lot — while the loss at the stop stays the same $10.
Does the risk percentage change for different currency pairs?
The percentage itself does not — it is a property of your account rather than of the instrument. What changes is the size: on pairs with a different pip value the same risk amount gives a different number of lots. On volatile crosses the stop length grows as well, which again reduces the size at an unchanged risk.
Can 1 % be risked on each of five open positions?
Only if they are genuinely independent. Five pairs with the dollar on the same side are one bet of 5 % of the account: when the dollar moves, the stops trigger together. The practical cap on total risk across all open trades is 2–4 %.
What if the stop from the system is too long for my deposit?
That is a signal that the instrument or the timeframe is not available to you right now rather than a reason to raise the percentage. The options are a pair with a smaller pip value, an account with a smaller size step, trading a lower timeframe with a shorter stop or increasing the deposit.
Does the size of the risk affect the win rate of a system?
No. The win rate depends on the distances to the stop and the target rather than on the size. Changing the risk share stretches both the profit and the depth of the hole in the same proportion — the quality of the system stays the same.
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