Forex Leverage and Margin Explained

Step 3 of 4 in Forex Essentials.

Leverage is the most misunderstood number in retail forex. It does not determine how much you can lose — your stop does that. Leverage determines how much capital a position ties up, and therefore how many positions you can hold at once before the broker starts closing them for you.

Margin: what the position locks up

Required margin = position value ÷ leverage

Buying one standard lot of EUR/USD at 1.1000 creates a position worth $110,000. What that costs to hold depends entirely on your leverage:

The position is identical in all four rows. Same pair, same size, same profit and loss per pip. Only the capital held aside differs.

The words brokers use

• Balance — closed-trade cash in the account.
• Equity — balance plus or minus the profit and loss on open positions. This is the number that matters; it moves tick by tick.
• Used margin — the total locked up by open positions.
• Free margin — equity minus used margin. What is available for new positions and for absorbing losses.
• Margin level — equity ÷ used margin, as a percentage. Brokers act on this number.

When margin level falls to 100%, equity has dropped to exactly the margin required — a margin call, usually a warning. When it falls to the broker's stop-out level (commonly 50%), positions are closed automatically, worst first, until the level recovers.

Where the stop-out actually sits

The useful question is how far price can move before the broker intervenes.

Take a $5,000 account, long one standard lot of EUR/USD at 1.1000 with 1:100 leverage and a 50% stop-out:

• Position value: $110,000 → required margin $1,100
• Margin call (equity = $1,100): price must fall to 1.0610 — 390 pips
• Stop-out (equity = $550): price must fall to 1.0555 — 445 pips

So this position survives a 445-pip adverse move before forced liquidation.

Now raise the leverage to 1:500. Margin drops to $220 and the stop-out moves to roughly 1.0522 — 478 pips away. Higher leverage moved the stop-out further, because less equity is tied up.

That is the counterintuitive part, and it is why "high leverage blows up accounts" is imprecise. High leverage does not blow up accounts. High leverage permits oversized positions, and oversized positions blow up accounts.

The trap: leverage as permission

Change the size instead of the leverage and the picture reverses. Same $5,000 account, same 1:100 leverage, but three standard lots:

• Position value $330,000, margin $3,300, free margin $1,700
• One pip is now worth $30
• Stop-out arrives after roughly 143 pips

A single ordinary day's range in EUR/USD is 60–100 pips. This position is one news event from liquidation, and no stop loss was ever involved.

The failure was never the 1:100. It was choosing three lots on a $5,000 account — a choice the leverage made possible but did not require.

Rules that keep it boring

1. Size from your stop, not from your margin. Risk amount ÷ (stop in pips × pip value) gives the units. Then check the margin is affordable — never the reverse.
2. Keep used margin well under half your equity. Under 20% is comfortable. If a normal day's volatility can push you near a stop-out, the position is too big.
3. Count correlated positions as one. Long EUR/USD, long GBP/USD and short USD/CHF is three tickets and one dollar bet. Margin is charged three times; the risk concentrates once.
4. Remember the stop-out is not a stop loss. It fires on equity, not on your analysis, at whatever price is available. Set your own stop first so the broker's never triggers.