Position Sizing Calculator Guide

    The #1 factor that separates profitable traders from the rest. Learn how to calculate the right position size for every trade.

    Master Position Sizing & Never Blow Up an Account

    The #1 Risk Management Skill

    Position sizing determines how many shares to buy based on your account size and risk tolerance. The formula: Position Size = (Account × Risk%) ÷ (Entry - Stop). This single skill separates profitable traders from those who blow up accounts.

    • Professional traders risk 0.5-2% per trade maximum
    • Beginners should start at 0.5-1% until consistent
    • Wider stops mean fewer shares to maintain same risk
    1-2%
    Max Risk Per Trade
    100%
    Account Protection
    5
    Simple Steps
    $0
    Free Calculator

    The Position Sizing Formula

    Master this formula and you'll never blow up an account

    The Core Formula

    Position Size = (Account × Risk%) ÷ (Entry - Stop)

    Where Risk% is typically 1-2% of your account

    Example Calculation

    Account Size:
    $25,000
    Risk Per Trade:
    2% ($500)
    Entry Price:
    $150.00
    Stop Loss:
    $145.00
    Risk Per Share:
    $5.00

    Position Size

    100 shares

    $500 ÷ $5 = 100 shares

    5-Step Position Sizing Process

    1

    Determine Account Risk

    Decide the percentage you'll risk per trade (1-2% recommended)

    2

    Calculate Dollar Risk

    Multiply your account size by risk percentage

    3

    Set Your Stop Loss

    Identify the technical level where your trade idea is invalidated

    4

    Calculate Risk Per Share

    Subtract stop price from entry price

    5

    Divide to Get Position Size

    Dollar risk ÷ Risk per share = Number of shares

    Why Position Sizing Matters

    Survive losing streaks - Even the best traders have 5-10 losing trades in a row. Proper sizing keeps you in the game.
    Remove emotion - When you know your exact risk, you can let trades play out without panic selling.
    Compound consistently - Small consistent gains beat volatile swings. Position sizing enables consistency.
    Scale appropriately - As your account grows, your position sizes grow proportionally, accelerating gains.

    Common Mistakes to Avoid

    Risking too much - Never risk more than 2% per trade, even on 'sure things'
    Ignoring stop distance - Wide stops require smaller positions to maintain risk
    Sizing based on conviction - Your position size should be based on math, not feelings
    Not adjusting for volatility - Volatile stocks need smaller positions to account for wider swings

    Frequently Asked Questions

    What is position sizing in trading?

    Position sizing determines how many shares or contracts to buy based on your account size and risk tolerance. It's the process of calculating trade size so that if your stop loss is hit, you only lose a predetermined percentage of your account (typically 1-2%).

    How do I calculate proper position size?

    Position Size = (Account Risk Amount) ÷ (Trade Risk Per Share). For example, with a $10,000 account risking 1% ($100) on a trade with a $2 stop loss distance, your position size is 50 shares ($100 ÷ $2).

    What percentage should I risk per trade?

    Professional traders typically risk 0.5% to 2% per trade. Beginners should start with 0.5-1% until they develop consistency. The key is keeping risk small enough that a string of losses won't significantly damage your account.

    Why is position sizing more important than win rate?

    You can be profitable with a 40% win rate if your winners are larger than your losers. Position sizing ensures that no single trade can blow up your account, giving you enough trades to let your edge play out over time.

    How does position sizing relate to stop loss placement?

    Your stop loss distance directly affects position size. A wider stop means fewer shares to maintain the same dollar risk. This is why technical stop placement should come first, then calculate position size based on that distance.

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