Calculate optimal position sizes for crypto trades using Kelly Criterion, fixed fractional, and volatility-adjusted methods.
position sizing is the difference between a bad trade costing you 1% and costing you 30%. Most traders focus on entry signals while ignoring the math that actually determines their survival.
This guide provides calculators and formulas for sizing positions properly.
Every position size calculation needs three inputs:
Formula:
Position Size = (Account × Risk Per Trade) / (Entry Price - Stop Loss)
The simplest approach. Risk a fixed percentage per trade.
Risk Amount = Account Balance × Risk Percentage
Position Size = Risk Amount / Stop Distance (in dollars)
Risk Amount = $10,000 × 0.01 = $100
Position Size = $100 / $2,000 = 0.05 BTC
Position Value = 0.05 × $40,000 = $2,000 (20% of account)
Pros: - Simple to calculate
Cons: - Doesn't account for win rate
| Trader Type | Risk Per Trade |
|---|---|
| Conservative | 0.5% |
| Standard | 1.0% |
| Aggressive | 2.0% |
| Maximum | 3.0% |
Never risk more than 2% without exceptional circumstances.
Mathematically optimal sizing based on edge and win rate.
Kelly % = W - [(1-W) / R]
Where:
W = Win rate (decimal)
R = Win/Loss ratio (average win / average loss)
Kelly % = 0.55 - [(1-0.55) / 1.5]
Kelly % = 0.55 - [0.45 / 1.5]
Kelly % = 0.55 - 0.30
Kelly % = 0.25 or 25%
Full Kelly is too aggressive for most traders. Use half or quarter Kelly:
Practical Position = Kelly % × 0.5
25% Kelly = 12.5% practical position
Kelly assumes:
In crypto, these assumptions rarely hold. Use Kelly as a ceiling, not a target.
Size positions based on current market volatility.
Position Size = (Account × Risk%) / (ATR × Multiplier × Entry Price)
Stop Distance = $1,500 × 2 = $3,000
Position Size = $100 / $3,000 = 0.0333 BTC
Position Value = 0.0333 × $40,000 = $1,333
When volatility increases, positions automatically decrease:
| ATR | Stop Distance | Position Size | Position Value |
|---|---|---|---|
| $1,000 | $2,000 | 0.05 BTC | $2,000 |
| $1,500 | $3,000 | 0.033 BTC | $1,333 |
| $2,000 | $4,000 | 0.025 BTC | $1,000 |
This protects you during volatile periods.
Track total portfolio heat (open risk) and size accordingly.
Portfolio Heat = Sum of (Position Size × Distance to Stop)
Maximum Heat = Account × Max Heat Percentage
Available Heat = Maximum Heat - Current Heat
Current positions:
Current Heat = $100 + $60 = $160
Max Heat (2%) = $10,000 × 0.02 = $200
Available Heat = $200 - $160 = $40
New position maximum risk: $40
This prevents overexposure even when individual positions are sized correctly.
| Column | Content |
|---|---|
| A | Account Balance |
| B | Risk Per Trade % |
| C | Entry Price |
| D | Stop Loss Price |
| E | Position Size (calculated) |
| F | Position Value (calculated) |
| G | Risk Amount (calculated) |
Risk Amount (G2): =A2*B2
Stop Distance: =ABS(C2-D2)
Position Size (E2): =G2/ABS(C2-D2)
Position Value (F2): =E2*C2
A1: Account Balance B1: 10000
A2: Risk % B2: 0.01
A3: Entry Price B3: 40000
A4: Stop Loss B4: 38000
A5: Stop Distance B5: =ABS(B3-B4)
A6: Risk Amount B6: =B1*B2
A7: Position Size B7: =B6/B5
A8: Position Value B8: =B7*B3
A9: Account % B9: =B8/B1
Correlated positions compound risk. Adjust sizing for correlation:
When BTC and ETH both long:
Standard sizing would give:
With 0.8 correlation:
Adjusted Total = 4% × (1 + 0.8) / 2 = 3.6% effective exposure
Reduce each by: 3.6% / 4% = 90%
Adjusted positions: 1.8% each
Scale position size based on setup quality:
| Setup Quality | Position Size Multiplier |
|---|---|
| A+ Setup | 1.5× standard |
| A Setup | 1.0× standard |
| B Setup | 0.75× standard |
| C Setup | 0.5× standard |
A+ Setup requires: - Multiple timeframe confirmation
"I'm really confident" isn't a position sizing input. Use the calculator regardless of feelings.
A 50% loss requires 100% gain to recover. Proper sizing keeps losses recoverable.
| Loss | Required Gain to Recover |
|---|---|
| 10% | 11% |
| 20% | 25% |
| 30% | 43% |
| 50% | 100% |
| 75% | 300% |
Smaller accounts can take slightly higher risk (more important to grow). Larger accounts should be more conservative (preservation matters).
Include realistic costs in stop distance:
Effective Stop = Stop Distance + (Entry × Fee% × 2) + Expected Slippage
Position Size (BTC) = Account × 0.01 / Stop Distance (USD)
Position Size = (Account × 0.01) / (ATR × 2)
Max Position = Account × 0.20 // Never more than 20% in single position
If calculated position > Max Position, use Max Position
What's the maximum I should risk per trade? 2% is the standard maximum. Going to 3% is aggressive and should be rare. Never exceed 5% per trade regardless of conviction.
Should I use the same position size for all trades? No. Adjust based on stop distance, volatility, and setup quality. The risk amount stays constant, but position size varies.
How do I size positions for scaling in? Allocate total position size across entries. If planning 3 entries, size each at 33% of calculated total.
Does position sizing work for leverage trades? Yes, but calculate based on notional exposure. A 10× leveraged position of $1,000 has $10,000 exposure and should be sized accordingly.
A mathematical formula that determines the optimal position size to maximize long-term growth based on win rate and payoff ratio.
The process of determining how much capital to allocate to a single trade based on account size, risk tolerance, and stop-loss distance.
A statistical measure of how two assets move in relation to each other, ranging from +1 (perfectly together) to -1 (perfectly opposite).
A trader's confidence level in a trade thesis, which should scale proportionally with position size and inversely with stop distance.
The practice of entering a position gradually by adding to it in increments rather than committing full size at once.
The degree and speed of price fluctuation over a given period. High volatility means large, rapid price swings; low volatility means small, gradual movements.
*Disclaimer: The content on this website is for informational purposes only and should not be construed as financial, investment, or trading advice. Cryptocurrency trading involves substantial risk of loss. Past performance does not guarantee future results. Always do your own research and consider your financial situation before making any investment decisions.