Position Sizing Formula Every Scalper Should Memorize

[Fairman]

Nice, having the lot size on the chart the second you drop the stop is the way to do it. Worth adding pip value handling for non-USD quote pairs and gold though, that's where most people's mental math goes wrong.

[FXS Prop Desk]

Switching between balance and equity as the base is a useful option, and it is worth spelling out when each makes sense. Sizing from equity means losing trades left open shrink the next position, which is protective. Sizing from balance ignores floating profit, which stops a trader from pyramiding on paper gains that might vanish. For a prop account with a daily drawdown measured on equity, the equity base is usually the safer default, because that is the number the firm is watching. A small note in the panel showing which base is active would avoid confusion on a busy morning.