Candleling

Position Sizing: The Boring Skill That Saves Accounts

How much to buy isn't about conviction — it's arithmetic that starts with the most you're willing to lose.

Ask a beginner how they size a trade and you'll hear vibes. Ask a professional and you'll hear: size = risk budget ÷ stop distance.

Worked example: $10,000 account, willing to risk 1% ($100). Entry $50, stop $48 → distance $2. Position = $100 ÷ $2 = 50 shares. If stopped out: −$100. If target hits at $56: +$300 (+3R).

  • Same idea, tighter stop → larger position (same dollar risk)
  • Wider stop → smaller position
  • Volatile assets force smaller sizes — that's correct behavior, not cowardice

    • Notice what position sizing does psychologically: it makes losses survivable in advance, which is what keeps revenge trading and doubling-down from ever feeling necessary.

    It also reframes losing streaks. With 1% risk, ten straight losses cost ~10% of equity — painful but recoverable. At 20% risk, the same streak is game over.

    Practice this interactively — free

    The “Position Sizing & R” path turns this into short chart exercises where you make the call and see what actually happened next.

    Try the interactive lesson Create free account

    Common questions

    What percent should I risk per trade?
    Common professional guidance ranges 0.25–2%. Higher risk doesn't raise expectancy — it raises variance and ruin probability.
    Does sizing change my win rate?
    No — it changes the consequences. That's precisely why it's controllable when everything else isn't.
    Can I practice this without money?
    Yes — that's exactly what Candleling's simulator trains: risk-first sizing until it's automatic.