Position sizing determines how much capital is allocated to each trade — and therefore how much can be lost on any single adverse move. A strategy with a 55% win rate and 2:1 reward-to-risk can still bankrupt an account if position sizing is too aggressive during a drawdown sequence. Conversely, an excellent strategy that uses overly conservative position sizing will accumulate capital too slowly to overcome transaction costs and small adverse moves. The position sizing model is a multiplier: it amplifies both the returns and the drawdowns of the underlying strategy. This guide covers the five most practical position sizing models for automated crypto bot trading, their mathematical properties, and how to select and configure them in DennTech.
Related guides: Position Sizing Formula Guide, Portfolio Heat, Stop-Loss, Liquidation Risk.
Model 1: Fixed Dollar Amount
Position Size = Constant Dollar Amount (e.g., $500 per trade regardless of account size)
Best for: Simple DCA strategies where consistent dollar accumulation is the goal
Pros: Simple, predictable, psychologically easy to understand
Cons: After a drawdown, fixed dollar size represents a larger percentage of remaining capital (increasing drawdown risk); after gains, it represents a smaller percentage (limiting compounding)
Model 2: Fixed Percentage of Account
Position Size = Account Equity × Risk Percentage Example: $10,000 × 2% = $200 risk per trade Trade size = $200 / (stop loss distance in %) = $200 / 5% = $4,000 position
Best for: Most indicator-based strategies (RSI, EMA, MACD, Bollinger Bands)
Pros: Automatically scales with account growth (compounding) and contracts after losses (drawdown protection). The most widely used professional approach.
Cons: Requires knowing the stop-loss distance before calculating position size (the stop placement and position sizing must be coordinated)
Standard setting: risk 1–2% of account equity per trade. For a $10,000 account with a 2% risk rule and a 5% stop-loss, the position size is $4,000. See our full formula guide.
Model 3: ATR-Normalized Sizing
ATR-based stop distance = 1.5 × ATR(14) Position Size = (Account × Risk %) / ATR-based stop distance
Best for: Strategies using ATR-based stops (the stop adapts to volatility; position size adapts correspondingly)
Pros: Position size automatically adjusts for market volatility — when ATR is high (volatile market), stop distance is wider and position size is smaller; when ATR is low, stop is tighter and position size is larger. Maintains constant dollar risk across all market conditions.
Cons: More complex to calculate; requires understanding ATR. See our ATR guide.
Model 4: Kelly Criterion
Kelly % = (Win Rate × Average Win / Average Loss - Loss Rate) / (Average Win / Average Loss) Simplified: Kelly % = W - (L / R) Where W = win rate, L = loss rate, R = win/loss ratio
Best for: Advanced traders with statistically robust strategy metrics (100+ trades)
Pros: Theoretically maximizes long-run geometric growth rate
Cons: Full Kelly is typically too aggressive — causes extreme volatility. Use 0.25× Kelly or 0.50× Kelly (fractional Kelly). Requires accurate win rate and win/loss ratio estimates from sufficient trade history (50+ trades minimum; 100+ preferred). See our Win Rate vs Profit Factor guide.
Model 5: Portfolio Heat-Based Sizing
When running multiple simultaneous strategies, cap the total percentage of account at risk across all open positions. This requires coordinating individual position sizes with a total portfolio risk limit. See our Portfolio Heat guide for the full framework. The DennTech portfolio heat system implements this automatically — as positions are opened, it tracks total portfolio heat and prevents new entries when the heat limit is reached.
Choosing the Right Model for Your Strategy
| Strategy Type | Recommended Model | Risk % |
|---|---|---|
| RSI / Bollinger / CCI mean reversion | Fixed % with ATR stop | 1–2% |
| EMA / MACD trend following | Fixed % with ATR stop + portfolio heat | 1–2% |
| Grid trading | Fixed dollar per grid level | Calculated by grid total span |
| DCA accumulation | Fixed dollar per DCA order | N/A (no stop in pure DCA) |
| Advanced multi-strategy portfolio | Fractional Kelly + portfolio heat | 0.5–1% per strategy |
Configuring Position Sizing in DennTech
- Navigate to Strategy → [Your Strategy] → Risk Management
- Select position sizing model: Fixed Dollar, Fixed Percentage, ATR-Normalized, or Kelly
- Set risk percentage: 1–2% recommended for beginners; 0.5–1% for conservative multi-strategy portfolios
- Set portfolio heat limit if running multiple strategies
- Review calculated position size for the current ATR and account equity before activating
Full documentation at DennTech docs. All strategies at the strategies page. Start at the pricing page.
Frequently Asked Questions
- Should beginners use Kelly Criterion for position sizing?
- No — Kelly Criterion should not be used by beginners for two reasons. First, reliable Kelly estimates require 50–100+ trades of statistical data from the specific strategy and configuration being run; beginners do not have this data. Second, even partial Kelly (0.25× or 0.50×) can produce larger position sizes than the 1–2% fixed percentage rule for strategies with good metrics, increasing drawdown risk during the statistical variance that all strategies experience. Start with fixed percentage (1–2% risk per trade) and only consider Kelly after accumulating 100+ trades of reliable metrics. See our beginner guide.
- How do I coordinate stop-loss distance and position size to maintain consistent risk?
- The formula is: Position Size = (Account Equity × Risk %) / Stop Distance %. For a 2% risk rule on a $5,000 account with a 4% stop-loss: Position Size = ($5,000 × 0.02) / 0.04 = $100 / 0.04 = $2,500 position (exposing $100 to the stop). This ensures that if the stop is hit, you lose exactly 2% of account equity regardless of where the stop is placed. When ATR-based stops are wider (volatile market), this formula automatically produces smaller positions — see our ATR guide. Compare editions at the pricing page.
- Can I use different position sizing models for different strategies in the same DennTech portfolio?
- Yes — DennTech allows per-strategy position sizing configuration. You can run fixed percentage sizing on your RSI mean-reversion strategy while using ATR-normalized sizing on your EMA trend strategy. The portfolio heat system coordinates the total risk across all strategies simultaneously — as long as total portfolio heat stays within your configured limit, each strategy can use its own sizing model independently. This is the recommended multi-strategy approach. See our portfolio heat guide and explore the live demo. Start at the pricing page.
Risk framework: Position Sizing Models (this guide), Position Sizing Formula, Portfolio Heat. All strategies at the strategies page.