Given account size, risk per trade, entry, and stop — how big should the position be?
This is the standard "fixed fractional risk" sizing formula used by every disciplined trader. Risk per trade should typically be 0.5%–2% of account.
The number-one cause of blown trading accounts is over-sizing. A trader who risks 5%+ per trade and hits a 5-loss streak (which happens roughly every 30 trades at any reasonable win rate) is down 23%. A trader who risks 1% per trade and hits the same streak is down 5%. Same skill, vastly different outcome.
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