Trade journaling · Intermediate

Using Journal Data To Refine Position Sizing

A 1-minute lesson from the MarketPro academy, one of 14 in trade journaling and review.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

Short answer

Position sizing decisions are often made once, at the start of a trading approach, and rarely revisited. A journal that tracks risk per trade alongside outcomes gives you the data needed to reassess whether your sizing actually matches your strategy's real behavior.

Two figures from your journal are especially useful here: the typical size of your losing streaks (how many losses in a row have you actually experienced) and the variability of trade outcomes (how much do results swing from trade to trade). Position sizing that looked reasonable in theory can feel very different once you've lived through a real losing streak recorded in your own data.

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Review your longest actual losing streak and calculate what it did to your account at your current risk-per-trade level
Compare position sizing consistency across setup tags — are you sizing some setups more aggressively without a clear reason?
Check whether sizing has crept upward after wins or shrunk after losses, which often reflects emotion rather than a deliberate plan

This kind of review does not tell you a single "correct" position size, since that depends on personal risk tolerance and goals, but it does make the real consequences of your current sizing visible rather than theoretical. Because leverage and position size both amplify losses as well as gains, sizing decisions are worth revisiting deliberately rather than left on autopilot.

Lesson 13 of 14 in Trade journaling and review

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

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Not investment advice. Past performance is not indicative of future results.