Position Sizing Guide: How Many Shares or Contracts to Trade
Position sizing converts a signal into risk. It is the single most important calculation in trading and the one most often done by intuition.
Most strategies do not fail because the signal was wrong. They fail because the position was too large for the drawdown that followed. Risk management is the part you control.
No prior knowledge assumed. Start here.
Position sizing converts a signal into risk. It is the single most important calculation in trading and the one most often done by intuition.
Most strategies do not fail because the signal was wrong. They fail because the position was too large for the drawdown that followed.
A risk-reward ratio means nothing without a win rate. Together they determine expectancy; separately they are marketing.
A stop defines what being wrong looks like. Placing it by how much money you are willing to lose is the most common and most expensive error in trading.
Assumes you know order types, charts, and basic risk sizing.
Diversification is measured in independent bets. Most retail portfolios that look diversified are a single macro exposure wearing several tickers.
Traders quit because of how long a drawdown lasts, not how deep it goes. Both are predictable from your strategy and both should be planned for.
A hedge is an expense that buys a narrower range of outcomes. The question is never whether it costs money, but whether the reduction is worth the price.
Leverage does not multiply returns. It multiplies outcomes and adds a path-dependent drag, which is why the optimal amount is far lower than intuition suggests.
Risk of ruin is the probability that a strategy with a positive edge still destroys your account. The main input is not the edge; it is position size.
Entries get the attention; exits determine the size of your average win. Most traders cut winners early for the same reason they hold losers too long.
A trailing stop is a rule for how much open profit you are willing to return in exchange for staying in a move. Every version is that trade-off in different clothes.
Assumes comfort with statistics, code, or derivatives.
Kelly gives the position size that maximises long-run growth. It also produces drawdowns that no human tolerates, which is why professionals use a fraction of it.
Volatility clusters, which means it is partly predictable. Scaling exposure to a constant risk target is one of the few genuinely free improvements available.
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