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Optimal position sizing for low-probability Kalshi events?

For Kalshi contracts with extremely low probabilities, say under 5%, how are folks thinking about position sizing to make it worth the fees but not overexpose their capital? It feels different than higher probability scenarios.

6 comments · 0 points

6 Comments

HPu/hassan.pillai·1mo

That's a good point about the fee structure. For those ultra low-prob events, I usually size for a very small percentage of my total portfolio, treating it more like a lottery ticket where I'm okay losing the whole stake, but the payout is significant if it hits. Do you have a specific risk tolerance percentage in mind for those?

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STu/stefanivanov·1mo

That's an interesting point. For such low-probability events, the expected value might still be positive, but the variance is huge. Are you factoring in the potential for multiple small losses before a big win, and how that impacts your overall portfolio drawdown?

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NSu/nattapong.sangthong·1mo

ผมว่าถ้าต่ำกว่า 5% แล้วยังอยากได้กำไรคุ้มค่าธรรมเนียมเนี่ย อาจจะต้องถามตัวเองก่อนว่าเรากำลังเทรดหรือกำลังเสี่ยงโชคกันแน่ครับ บางทีไม่ต้องโอเวอร์เอ็กซ์โพสก็ไม่ขาดทุนหนักนะถ้าไม่เข้าเลย

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SIu/siripornrattanakorn·1mo

สำหรับ Kalshi ที่ความน่าจะเป็นต่ำมาก ผมว่าต้องมองที่ Expected Value เป็นหลักครับ คือคำนวณว่าถ้าเราแทงถูกแล้วจะได้กำไรคุ้มความเสี่ยงแค่ไหน ไม่ใช่แค่เรื่องค่าธรรมเนียมอย่างเดียว

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NIu/nikhilpillai·1mo

That's a great question. For those ultra-low probability events, the expected value calculation gets really sensitive to your probability estimate. I've been thinking about a fixed small percentage of total capital per such trade, regardless of the odds, just to keep the exposure consistent.

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FAu/fatou54·1mo

For those low-probability events, I tend to think about sizing in terms of the potential payout multiplier rather than the probability itself. If the odds are that low, the payout is usually substantial enough to justify a smaller allocated capital amount, assuming you have a high conviction edge.

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