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Position Size Calculator

Calculate your optimal position size based on risk management principles. Enter your account balance, risk per trade, and stop loss to find the perfect position size. Includes Kelly Criterion and R:R analysis.

1 Account & Risk

Conservative: 1% | Standard: 2% | Aggressive: 5%

2 Trade Setup

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Below entry for long, above for short

3 Kelly Criterion (Optional)

Enter your historical win rate to calculate the optimal position size using Kelly Criterion:

Your historical % of winning trades

Position Sizing Result

Position Size
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Risk Amount
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Potential Reward
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Risk : Reward
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Margin Required
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Stop Distance
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Kelly Optimal
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Risk Assessment

Account risk level:

Conservative (1%)Standard (2%)Aggressive (5%)Reckless (10%+)

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Position Size at Different Risk Levels

Risk %Risk AmountPosition SizeQuantityMargin (at lev.)Max Consecutive Losses to Ruin

R:R Breakeven Analysis

Minimum win rate needed at each R:R ratio to break even:

R:R RatioMin Win RateYour Win RateExpected Value per TradeVerdict

Trade Plan Summary

Entry Plan

Asset—
Direction—
Entry Price—
Position Size—
Quantity—
Leverage—

Risk Management

Stop Loss—
Take Profit—
Risk $—
Reward $—
R:R—
Account Risk—
Disclaimer: Position sizing is a risk management tool, not a guarantee of profit. Past win rates don't guarantee future results. The Kelly Criterion assumes independent trades — real markets have correlation and fat tails. Always use stop losses and never risk more than you can afford to lose. This is not financial advice.

Frequently Asked Questions

How do you calculate position size?
Position Size = (Account × Risk %) / (Entry - Stop Loss). With $10K risking 2% ($200), entry $60K, stop $58K ($2K risk/coin): 0.1 BTC position.
What % should I risk per trade?
Professional traders risk 1-2%. Conservative: 1% (need 100 losses to blow account). Standard: 2%. Aggressive: 3-5% (higher drawdowns).
What is the Kelly Criterion?
Kelly % = Win Rate - (1 - Win Rate) / R:R Ratio. Calculates mathematically optimal bet size. Most traders use half-Kelly (50% of full) to reduce volatility.
What's a good risk-reward ratio?
Minimum 1:2 (risk $1 to make $2). At 1:2, you only need 34% win rate to break even. Professionals target 1:3+.
How does leverage affect position sizing?
Leverage reduces margin needed but doesn't change risk. With 10x, you need 10% of position as margin. Your stop loss determines actual dollar risk, not leverage.