Why free margin, not the leverage setting, caps a scalper
Posted: Sat Oct 31, 2026 7:47 pm
Leverage of 1:500 sounds like freedom. In practice, the number that decides how many trades can be open is free margin, and the two are only loosely related.
Free margin is equity minus used margin. Every open position locks some margin, and every floating loss reduces equity. Scalpers who stack several entries in the same direction watch free margin shrink twice: once from margin being locked, and again from floating losses eating equity at the same time.
Here is the part that catches people. High leverage lowers the margin needed per position, which makes it feel safe to open more. But the loss per pip does not shrink with leverage. Lot size sets that. So a small account with high leverage can open a position size that a normal move wipes out, while still showing plenty of free margin on the screen.
Think of it as two separate budgets. Margin decides whether the order is allowed. Equity decides whether the account survives. Leverage only changes the first one.
A rough way to see the real limit: ask how many pips the market has to move against all open positions before free margin hits zero, then ask whether that distance is smaller than a normal spike on that pair. If it is, the leverage label is irrelevant, because the account is one candle away from trouble.
Another overlooked point is that some brokers reduce leverage ahead of news or over the weekend, which suddenly raises used margin on positions already open. Free margin can drop without a single price move.
For scalpers running many small positions, watching free margin as a percent of equity says more than any leverage figure on the account page.
How much of your equity do you let get locked as used margin during a busy session?
Free margin is equity minus used margin. Every open position locks some margin, and every floating loss reduces equity. Scalpers who stack several entries in the same direction watch free margin shrink twice: once from margin being locked, and again from floating losses eating equity at the same time.
Here is the part that catches people. High leverage lowers the margin needed per position, which makes it feel safe to open more. But the loss per pip does not shrink with leverage. Lot size sets that. So a small account with high leverage can open a position size that a normal move wipes out, while still showing plenty of free margin on the screen.
Think of it as two separate budgets. Margin decides whether the order is allowed. Equity decides whether the account survives. Leverage only changes the first one.
A rough way to see the real limit: ask how many pips the market has to move against all open positions before free margin hits zero, then ask whether that distance is smaller than a normal spike on that pair. If it is, the leverage label is irrelevant, because the account is one candle away from trouble.
Another overlooked point is that some brokers reduce leverage ahead of news or over the weekend, which suddenly raises used margin on positions already open. Free margin can drop without a single price move.
For scalpers running many small positions, watching free margin as a percent of equity says more than any leverage figure on the account page.
How much of your equity do you let get locked as used margin during a busy session?