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Risk management in trading: position sizing and the 1% rule

Basics · approx. 7 min read

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.

Read more: Wolfe Wave trading – entry, stop-loss & target line and what to look for in a signal service.