Risk amount ($)
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Position size (units)
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Notional value: —
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Why size from risk

Survivors decide size from how much they can lose, not how much they want to win. The formula: units = (account × risk%) ÷ (entry − stop). Risk 1% per trade and a losing streak barely dents you; risk 20% and two bad trades end the account. Pair this with the liquidation calculator so your stop sits well before liquidation, and the PnL calculator to check the reward is worth the risk.