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Position Sizing

Position sizing is deciding how many shares to buy so that a single trade risks only a small, fixed fraction of your account.

In one line: Position sizing is deciding how many shares to buy so that a single trade risks only a small, fixed fraction of your account.

What it is

Position sizing answers 'how much?' — arguably the most important question in trading, more important than the entry itself. The goal is to ensure no single trade can do serious damage. The standard framework risks a fixed small percentage of your account (commonly 1–2%) per trade.

How it works

Size is derived from your stop, not guessed:

Shares = (Account × Risk%) ÷ (Entry price − Stop price)

The distance to your stop sets your risk per share; the account risk budget sets your total dollar risk; dividing gives the size. A tighter stop lets you buy more shares for the same dollar risk; a wider stop, fewer. This ties sizing directly to the risk-reward plan.

Worked example

Example

Account = $50,000. You risk 1% = $500 per trade. You buy a large-cap at $200 with a stop at $190, so risk per share is $10. Position size = $500 ÷ $10 = 50 shares ($10,000 position). If the stop hits, you lose $500 — exactly 1% — no matter how confident you felt. Change the stop to $195 (risk $5/share) and you could buy 100 shares for the same $500 of risk.

Why it matters

Position sizing is what keeps a string of losses — which is inevitable — from ending your account. It converts trading from gambling into a survivable process: even ten losers in a row at 1% each is a manageable ~10% drawdown, not a wipeout. No entry signal, however good, matters if a single bad trade can ruin you.

Entry Point Trading teaches sizing and exits alongside every call, because the entry is the easy part — surviving to compound is the hard part.

Keep learning

Related concepts

Stop-Loss
A pre-planned exit that caps the loss on a trade.
Risk-Reward Ratio
Sizing the potential gain against the potential loss before you enter.
Stock Signal
A structured buy/sell/hold call — and what a good one must include.
Swing Trading
Holding days to weeks to capture a single price swing.
Support and Resistance
Price levels where buyers and sellers repeatedly step in.
Momentum Investing
Buying strength, on the tendency of trends to persist.

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Common questions

FAQ

What is the 1% rule?
The 1% rule caps the loss on any single trade at 1% of your total account. It doesn't mean you invest only 1% — it means your stop-loss is placed so that if it's hit, you lose no more than 1% of the account. It's the simplest guardrail against catastrophic loss.
Is position size the same as how much I invest?
No. The dollar amount in the position can be large; the amount at risk is small. Risk is set by the distance to your stop, not the size of the position. Two traders can buy the same $10,000 position but risk very different amounts depending on where their stops sit.

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