🎯 What is Kelly Criterion?
The Kelly Criterion is a mathematical formula that helps investors determine the optimal amount of capital to allocate per trade, aiming to maximize long-term profits while controlling the risk of ruin.
In crypto trading, this tool is especially useful due to high volatility and large potential losses.
📐 Basic Formula
Standard formula:
Where:
b = profit ratio (odds - 1)
p = probability of winning
q = probability of losing = 1 - p
A simpler version for crypto:
Or:
💰 Examples of Kelly in Crypto
Example 1: Bitcoin (Long)
Probability of price increase: 60%
Probability of price decrease: 40%
Expected profit: +20%
Stop loss: -10%
➡️ Conclusion: allocate 40% of capital to this BTC Long trade. You can execute safely via Binance:
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Example 2: High-Risk Altcoin Trade
Win rate: 45%
Avg win: +50%
Avg loss: -25%
➡️ Conclusion: allocate 17.5% of capital for this altcoin trade.
Example 3: Trade Without Edge (Avoid!)
Win rate: 50%
Avg win: +10%
Avg loss: -10%
➡️ Conclusion: do not trade – no edge exists!
⚠️ Risks of Full Kelly in Crypto
Extreme volatility: crypto can swing 20–30% per day
Slippage: actual price differs from expected
Wrong estimates: win rate is hard to predict
Severe drawdowns: losing streaks can wipe out 50–80% of capital
🛡️ Fractional Kelly – Safer Version
| Type | Kelly % | Characteristics | Suitable For |
|---|---|---|---|
| Half Kelly | 50% | Reduce 50% risk, retain 75% return | Experienced traders |
| Quarter Kelly | 25% | Very safe, low drawdown | Beginners, risk-averse |
| One-Tenth Kelly | 10% | Extremely conservative | Small capital, learning |
Example: Full Kelly = 40%
Half Kelly = 40% × 0.5 = 20% capital
Quarter Kelly = 40% × 0.25 = 10% capital
📊 Practical Kelly Calculation in Crypto Trading
Collect data: at least 50–100 trades
Calculate Avg Win / Avg Loss
Compute Kelly % and apply Fractional Kelly
Example:
Win rate: 55%
Avg win: 2.73%
Avg loss: 2%
💡 Best Practices
Track all trades – use a spreadsheet or trading tool
Weekly review – recalculate Kelly based on updated data
Start with Quarter Kelly and increase as confidence grows
Always set hard stop losses – Kelly is theoretical
Diversify – never all-in on one coin even if Kelly suggests so
📈 Kelly vs Fixed %
| Strategy | $10,000 after 100 trades |
|---|---|
| Fixed 2% | $12,500 |
| Fixed 5% | $18,700 (high risk) |
| Quarter Kelly | $22,300 |
| Half Kelly | $31,200 (high drawdown) |
| Full Kelly | $45,000 or… $0 (extreme risk) |
(Assuming 55% win rate, RR 1.5:1)
💡 Conclusion: Kelly Criterion is a powerful tool to manage capital and risk in crypto. Using Fractional Kelly helps maximize profits while controlling drawdowns. Always trade safely via trusted platforms like Binance:
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