How to Size Positions and Protect Your Account

IMPORTANT DISCLAIMER

THIS IS NOT FINANCIAL ADVICE. This content is for educational and informational purposes only. It is not personalized to any individual's financial situation, risk tolerance, or investment goals. All examples, numbers, and formulas are illustrative and should not be construed as recommendations. Trading futures, options, and derivatives involves substantial risk of loss and is not suitable for all investors. Past performance is not indicative of future results. Always consult a qualified financial advisor before making any trading or investment decisions.

1. Base Position Sizing

Position sizing determines how many contracts to trade based on your available risk capital and potential drawdown.

Core Formula (Non-Martingale)

Contracts = ⌊ Risk Capital / Max Drawdown per Contract ⌋

The floor function (⌊ ⌋) rounds down since fractional contracts cannot be traded.

Example:

• Risk capital: $10,000
• Max drawdown per contract (from backtesting): $3,460
• Calculation: 10,000 / 3,460 = 2.89 → 2 contracts

Martingale Adjustment

When using martingale strategies, account for the multiplier effect:

Base Contracts = ⌊ Risk Capital / (Max Drawdown × Martingale Multiplier) ⌋

Example:

• Risk capital: $15,000
• Max drawdown per contract: $800
• Martingale multiplier: 4× (two levels: base → 2× → 4×)
• Calculation: 15,000 / (800 × 4) = 4.68 → 4 base contracts

This would allow scaling: 4 base → 8 first level → 16 second level.

2. Calculating Drawdown

Drawdown figures come from backtesting your specific strategy. Some traders apply a safety buffer to account for future conditions differing from historical data.

Conservative Approach: Add a buffer (e.g., 50%) to your backtested drawdown figure before using it in calculations.

• Backtested drawdown: $800
• Adjusted drawdown (with 50% buffer): $1,200

This provides margin for unexpected volatility or strategy underperformance.

3. Scaling

Scaling means increasing position size as account equity grows. Two general approaches:

Aggressive Scaling

Recalculate using the base formula whenever account balance increases. Add a contract when the new floor value exceeds current position size.

Conservative Scaling

Use a padded drawdown figure or require a larger buffer before adding contracts. This delays scaling but preserves more cushion.

Key Principle: Scaling increases both potential returns and potential losses. Only scale when comfortable with the increased risk exposure.

4. Trimming

Trimming is the practice of withdrawing profits at predetermined thresholds to reset the account to base levels.

How It Works

1. Define a base balance (your starting/reset point)
2. Define a trim threshold (when to withdraw)
3. When the threshold is reached, withdraw the excess and continue trading at base size

Example:

• Base balance: $10,000
• Trim threshold: $17,500
• At $17,500: Withdraw $7,500, reset to $10,000

The "House Money" Concept

After two successful trim cycles in the example above, $15,000 has been withdrawn on a $10,000 base. At this point, even a total account loss results in net positive returns overall.

5. Emotional Considerations

Many traders emphasize the psychological aspect of position sizing:

• Trade only with capital you can afford to lose entirely
• If watching the account balance causes stress, the position may be too large
• Scaling should only occur when emotionally prepared for increased volatility
• Trimming can help maintain emotional detachment by regularly securing profits

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Quick Reference

Sizing Formulas

Non-Martingale: Contracts = ⌊ R / D ⌋ Martingale: Base = ⌊ R / (D × M) ⌋

R = Risk capital D = Max drawdown per contract M = Martingale multiplier

Whiteboard Template

Base Balance: $________ Trim Threshold: $________ Drawdown/Contract: $________ Safety Buffer: +____%

Core Principles

• Floor all calculations (no fractional contracts)
• Pad drawdown figures for safety margin
• Trim regularly to secure profits
• Scale only when emotionally ready
• Two trims = playing with house money

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REMINDER: The concepts above are educational frameworks, not trading advice. Individual circumstances vary significantly. Conduct thorough research and consult qualified professionals before implementing any trading strategy.