Position Sizing: The 1-2% Rule Explained (With Real Examples)

Ask a professional trader what separates survivors from blown accounts and you will rarely hear about entries, indicators, or news feeds. You will hear about position sizing.

The math is unforgiving: lose 50% of your account and you need a 100% gain just to get back to even. Position sizing exists to make sure you never get near that hole.

The 1-2% Rule

The rule is simple: never risk more than 1-2% of your total account on a single trade.

Risk does not mean position size. It means the amount you lose if your stop loss is hit. This distinction is where most beginners go wrong.

The formula:

Position size = (Account size x Risk %) / (Entry price - Stop price)

Example 1: A Stock Trade

• Account: $10,000
• Risk per trade: 1% = $100
• Stock entry: $50, stop loss: $46
• Risk per share: $4

Position size: $100 / $4 = 25 shares, costing $1,250.

Notice the position is 12.5% of the account, but the risk is only 1%. If the stop is hit, you lose $100 — annoying, survivable, repeatable.

Example 2: A Crypto Trade

• Account: $5,000
• Risk per trade: 2% = $100
• Coin entry: $2.00, stop loss: $1.70
• Risk per coin: $0.30

Position size: $100 / $0.30 = 333 coins, costing $666.

Crypto's volatility means wider stops, and wider stops mean smaller positions. The rule adapts automatically — that is its quiet genius.

Why 1-2% and Not More?

Losing streaks are not bad luck; they are a statistical certainty. Even a strategy with a 60% win rate will produce five losses in a row regularly.

• Risking 2% per trade, a 5-loss streak costs about 10% of your account — recoverable
• Risking 10% per trade, the same streak costs about 41% — now you need a 69% gain to break even

Same strategy, same streak, completely different outcomes. The only variable was position size.

The Mistakes That Break the Rule

Moving the stop after entry. Your risk calculation assumed the stop holds. Move it lower and your real risk silently doubles.

Revenge sizing. Doubling the next position to win back a loss turns a 1% rule into a 4% reality. This pattern shows up clearly in trade journals — if you track it.

Correlated positions. Five crypto positions at 2% risk each is not 2% risk. When the market drops, they all hit their stops together. Treat correlated trades as one position.

Ignoring fees and slippage. On small accounts especially, fees can turn a breakeven stop into a real loss. Log them.

Make It Automatic

Position sizing only works if you do it on every trade, including the exciting ones — especially the exciting ones.

Trackfolio's built-in Risk Manager calculates position sizes from your account size, risk percentage, and stop level, and your trade journal shows whether you are actually sticking to the rule. The traders who survive are rarely the smartest in the room; they are the best at not losing big.

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