Find the stop-loss price that caps your loss at a fixed amount for a given entry price and position size.
This is the inverse of position sizing: with the position already sized, it finds the stop-loss price that caps your loss at a chosen amount. The maximum loss divided by quantity gives the adverse price distance you can tolerate — subtracted from entry for a long, added for a short.
Long: Stop-loss price = Entry − Max loss / Quantity
Short: Stop-loss price = Entry + Max loss / Quantity
Price move % = (Stop-loss price − Entry) / Entry × 100Stops execute as market orders once triggered, so slippage can push the realized loss past the cap in fast markets, and fees add to the loss as well.