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f = (W × R – (1 – W)) / R *
Kelly often gives aggressive results. Most pros use Half-Kelly (20% in this example) or less. Final Takeaway (Save This) "Position sizing is the only part of trading you can control 100%." — Unknown trader You cannot control market direction. You cannot control gaps. But you can control exactly how much you lose when you are wrong. The Definitive Guide To Position Sizing Free
| Account Size | Aggressive (High confidence) | Conservative (Choppy market) | | :--- | :--- | :--- | | $5,000 | 2% risk ($100) | 0.5% risk ($25) | | $25,000 | 1.5% risk ($375) | 0.75% risk ($187) | | $100,000+ | 1% risk ($1,000) | 0.25% risk ($250) |
The Definitive Guide to Position Sizing (Free) Subtitle: How to calculate the exact amount to risk per trade so you never blow up your account again. Introduction: The #1 Mistake New Traders Make Most beginners ask: "What stock should I buy?" No signup
Example: 60% win rate, 2:1 reward → f = (0.6×2 – 0.4)/2 = 40%.*
You can have a winning strategy (60%+ win rate) and still go broke if you get the position size wrong. Conversely, you can have a coin-flip strategy and be wildly profitable with correct position sizing. f = (W × R – (1 –
The pros ask: "How much should I buy?"