RangeSight Help
Position sizing
Fixed fractional versus Kelly, and how risk of ruin differs on a prop firm account.
Open a guide below. Pages that already rank on their own URL stay there. This collection only files the question and links the canonical page. RangeSight does not recommend trades, brokers, prop firms, or a position size.
Each card is a question you can answer without an account when the page is free, or after you buy when the page is about the web app. Use the playground or the risk of ruin calculator for a short check. Use a prop firm page only after you confirm the current rule with the firm. Nothing here is a price forecast, and nothing here publishes a calculation method.
How should I think about fixed fractional vs Kelly position sizing?
Fixed fractional risks a constant share of current equity. Kelly asks what fraction would maximize long-run growth. RangeSight has no Kelly mode.
What is the difference between risk of ruin and Kelly for prop firm sizing?
Kelly looks for long-run growth. Risk of ruin asks whether this size hits a loss level that ends the account. On a prop firm, that level is a rule.