Analysis

Position Sizing

By Ryan Silk & Lawrence Polatchek · Reviewed April 2026 · Options Trading Glossary

Determining capital allocation per trade

What is Position Sizing?

Position Sizing The process of determining how many contracts or how much capital to allocate to a single trade relative to total portfolio size. Proper position sizing limits the damage from any single losing trade. Common guidelines include risking no more than 1-5% of portfolio value per trade and limiting total portfolio delta and theta exposure.

Complete Definition

The process of determining how many contracts or how much capital to allocate to a single trade relative to total portfolio size. Proper position sizing limits the damage from any single losing trade. Common guidelines include risking no more than 1-5% of portfolio value per trade and limiting total portfolio delta and theta exposure.

AV
Written by
ApexVol Research Team
Quantitative options research
All calculations use live ORATS institutional data — the same source used by professional volatility desks.
RS
Technical reviewer
Ryan Silk, ApexVol Founder
Reviewed for technical accuracy
10+ years trading options. Built ApexVol's pricing engine, Greeks model, and IV-rank methodology.
This guide is updated as market conditions and ORATS data change. Last revised 2026-05-12. How we research →

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