Risk management in trading: position sizing and the 1% rule
Most traders don't fail because of bad entries, but because of missing risk management. A good signal is worth little if a single losing trade costs half your account. This article covers the essentials: the 1% rule, correct position sizing and the risk-reward ratio.
The 1% rule
The simplest and most effective rule: risk no more than 1% of your account per trade. On a 10,000 account that is a maximum of 100 risk per trade – no matter how sure you are. The reason: even a streak of 10 losses in a row only costs you around 10% – survivable. Risk 20% per trade and five bad trades wipe you out.
Calculating position size
Position size always follows from risk, never from gut feeling. The formula:
Example: account 10,000, risk 1% = 100. Entry at 50, stop-loss at 48 → risk per share = 2. Position size = 100 ÷ 2 = 50 shares. However far away your stop is, your loss stays at 100.
The risk-reward ratio (RRR)
The RRR compares the potential profit with the risk. A common rule of thumb is at least 1:2 – the potential profit is double the possible loss. The key point: with a 1:2 RRR you are already profitable at a 40% win rate. That's why win rate alone is never meaningful.
Why the stop-loss comes first
A common beginner mistake: buy the position first, then think about where the stop goes. The correct order is reversed – set the stop-loss and target first, then derive risk and position size. That's exactly why every one of our signals comes with entry, stop-loss and target line together.
Common mistakes
- No stop-loss – "it'll turn around" is not a strategy.
- Moving the stop into the loss – letting losses run is the fastest way to blow an account.
- Adding to losers (martingale) – increases risk exponentially.
- Too many trades at once – the sum of all open risk counts too.
Position size in one line
The most important calculation in trading fits on one line:
Shares = (account size × risk in %) ÷ distance to the stop
An example: a 10,000 account, 1 % risk equals 100. If the stop sits 2.50 below the entry, that makes 40 shares. With a tighter stop the position may be larger – the risk in money stays the same. That is the whole point: you do not set the position size, you set the loss. The share count follows from it.
| Risk per trade | After 10 losses in a row | Gain needed to recover |
|---|---|---|
| 1 % | −9.6 % | +10.6 % |
| 2 % | −18.3 % | +22.4 % |
| 5 % | −40.1 % | +67.0 % |
| 10 % | −65.1 % | +186.0 % |
That last column is why experienced traders run such small risks: a 65 percent drawdown needs almost a tripling to get back to flat. Ten losses in a row sound like terrible luck, but at a 60 percent hit rate they happen statistically about once every 1,000 trades – several times over a trading life.
The R system: one unit instead of many currencies
1 R is the amount you risk on a trade. A 2 R win is twice the risk, a loss is −1 R. The benefit: trades of different sizes and in different markets become comparable, and you stop thinking in currency. All our studies are calculated in R – which is why they say "+0.37 R per trade" rather than "+280".
It also helps set a realistic expectation: if your average is +0.2 R per trade and you take 200 trades a year, that is 40 R. At 1 % risk per trade that is roughly 40 % on the account – before tax, with perfect discipline and no outliers. Any number promised well above that requires risks an account rarely survives.
The three mistakes that actually kill accounts
Moving the stop. A stop that gives way as soon as things get uncomfortable is decoration. Move it and you swap a small known loss for a large unknown one.
Averaging down. The position gets cheaper, the risk gets bigger and the reasoning gets worse. The same idea twice is not two ideas.
Scaling risk by feel. Doubling size after three winners means running your biggest stake exactly when the streak is statistically most likely to end.
Correlation: the invisible concentration risk
Five positions at 1 % risk each are not automatically 5 % of risk – they only are if the instruments move independently. Five technology stocks or five dollar pairs are in truth one position split five ways. So check not just the risk per trade but how much you are betting on the same theme overall: market, sector, currency, rate direction.
Important: This article provides general educational knowledge and is not investment advice. Trading carries substantial risk of loss. The rules above reduce risk but do not eliminate losses.
Signals with clear risk
Every Wolfe Wave signal comes with entry, stop-loss and target line – the basis for clean risk management. Four signals are always free.
View signals →Read more: Wolfe Wave trading – entry, stop-loss & target line and what to look for in a signal service.