Position Sizing and Risk Management for Options
Edge without sizing discipline is a slow way to go to zero. The math here is simple; the discipline is what separates accounts that compound from accounts that reset.
From max loss to contracts
Decide risk per trade as a percentage of account — 0.5% for 0DTE scalps, 1–2% for swing structures. Divide that dollar figure by max loss per contract and round down. If the answer is zero contracts, the trade is too big for the account; it is not an invitation to skip the rule.
Portfolio heat
Sum the max loss of every open position. Cap total heat at 5–6% of account. Correlated positions (SPY, QQQ and mega-cap tech all long) count as one bet for heat purposes, because they will lose together.
Loss limits and circuit breakers
Set a daily stop of roughly 2–3% of account and an absolute trade count limit. Most catastrophic days are revenge-trading days, not bad-strategy days. Log the stop-out and be done.
- Daily loss limit: stop trading, no exceptions.
- Three consecutive losers: halve size for the rest of the session.
- Never add to a losing 0DTE position.
Sizing against gamma regime
Negative-gamma sessions realize larger ranges. Same strategy, same conviction, smaller size — because the distribution of outcomes is wider, not because your read is worse.
Key takeaways
- Contracts = (account × risk%) ÷ max loss per contract, rounded down.
- Cap total portfolio heat and treat correlated names as one bet.
- Cut size in negative-gamma regimes automatically.
Practice this in the terminal
Test your knowledge
2 questions. Score 80% or higher to count this guide as mastered.
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Educational content only. Options involve substantial risk and are not suitable for every investor. Nothing here is financial advice.