Foundation · Lesson 4
Position Sizing: The Math That Saves You
Kelly, fixed fractional, volatility-adjusted — four position sizing methods, ranked by how likely they are to keep you solvent through a losing streak.
Author
David Chen, CFA
Peer reviewer
Somchai Wattana, CMT
15 min readPublished March 25, 2026Reviewed April 12, 2026
The math of staying solvent comes before the math of profit.