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Trading term

Position sizing

Deciding how much to risk on a single trade, which matters more than entry.

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Updated 2026-08-303 min readDefinition
Definition

Deciding how much to risk on a single trade, which matters more than entry.

Position sizing is the practical expression of risk management. A common approach is to risk a fixed small percentage of your account on any one idea, typically one or two percent.

Get this right and a run of losses is survivable. Get it wrong and one bad trade ends the account, no matter how good the analysis was.

In practice

With a 5000 dollar account risking 1 percent, you accept losing 50 dollars if you are wrong. That determines your size, given your stop.

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