ARMFLeverage and its risks
Leverage does not increase risk directly — the risk is set by the position size and the stop distance. Leverage decides something else: how much of the funds is locked for the position and how quickly the account reaches a forced close if there is no stop. We take apart the mechanics and calculate the thresholds.
What leverage is and what it actually changes
Leverage is the ratio between the notional of a position and the funds the broker locks for it. At 1:100 leverage a position with a notional of 100,000 requires 1,000 of margin. In itself that is not risk but a condition of access to size.
This is easy to check. Two trades: 0.10 lot with a 40-pip stop at 1:30 leverage and the same 0.10 lot with the same stop at 1:500. The loss at the stop is identical — $40. Only the locked margin differs: $333 against $20. The risk is set by the size and the stop, not by the leverage.
| Value | Formula | Example |
|---|---|---|
| Position notional | size × contract size | 10,000 |
| Margin | notional ÷ leverage | $100 at 1:100 |
| Free margin | equity − used margin | $900 with equity of $1,000 |
| Margin level | equity ÷ used margin × 100 % | 1,000 % |
The calculation is given for a pair whose base currency is the dollar. For the others the notional is converted into the account currency at the current rate of the base currency.
Margin call and stop-out: two different events
A margin call is a notification that the margin level has fallen to a threshold. A stop-out is a close initiated by the venue. The thresholds are stated in the account specification and differ between brokers; common values are 100 % and 50 %, but others occur too.
Let us work out where these thresholds sit in pips. A deposit of $1,000, leverage 1:100, 1 standard lot open on a pair with a pip value of $10. The margin for the position is $1,000, that is the whole account. The margin level starts at 100 %.
| Move against the position | Equity | Margin level | What happens |
|---|---|---|---|
| 0 pips | $1,000 | 100 % | The margin call threshold is reached immediately |
| 20 pips | $800 | 80 % | New positions unavailable |
| 50 pips | $500 | 50 % | Stop-out: the position is closed by force |
| 100 pips | $0 | 0 % | A state the account does not live to see |
What this table shows. A full lot on a deposit of $1,000 means the account is closed by a move of 50 pips — an ordinary intraday swing. And there is no stop: its role is played by the stop-out, but at the market price and without your involvement. That is what «trading with high leverage» looks like in terms of risk — not because leverage is dangerous but because it allowed a size incompatible with the deposit to be opened.
How to choose the leverage
A practical rule follows from the formulas: the leverage has to be sufficient to open the calculated size, and it is not a value that has to be «used in full».
The size is calculated from the risk and the stop. The leverage is checked afterwards: whether the free funds cover the margin for that size with a buffer.
the order of calculationThe reference is to use no more than 20–25 % of equity as margin. Then a move against the position is absorbed by the free funds rather than bringing the stop-out closer.
20–25 %Leverage of 1:500 with a size of 0.05 lot gives the same trade as 1:30 — simply with a smaller locked amount. What is dangerous is not the leverage but the size it makes technically possible.
a tool, not a strategyThe margin call and stop-out levels have to be known before opening an account: they decide at what move the positions will be closed without you.
from the specificationHow many positions fit into the account at different leverage
Leverage does not set the risk, but it does set a ceiling: how many trades can be held open at once before the free funds run out. The calculation is for a deposit of $5,000 and a size of 0.12 lot per position — the very one that gives 1 % risk with a 40-pip stop.
| Leverage | Margin per position | Positions up to 25 % margin | Positions up to the full account |
|---|---|---|---|
| 1:30 | $400 | 3 | 12 |
| 1:100 | $120 | 10 | 41 |
| 1:200 | $60 | 20 | 83 |
| 1:500 | $24 | 52 | 208 |
The margin in the table is calculated for a pair whose base currency is the dollar. For EUR/USD and other pairs with a different base the notional is converted into the account currency at the rate: at 1.0850 the same 0.12 lot at 1:100 leverage takes up not 120 but $130.
The right-hand column is given not as a reference but as an illustration: holding forty-one positions at 1 % risk means a total risk of 41 % of the account. The practical limit is set not by the margin but by the total risk limit — usually 2–4 %, that is two to four independent positions.
Where leverage really matters. In two cases. The first is tight stops: the size grows inversely with the distance, and at a stop of 10 pips the notional is four times larger than at 40. The second is accounts with a small deposit, where even a single position at 1:30 leverage takes up a noticeable part of the funds.
Frequently asked questions
How do you calculate leverage in trading?
The actual leverage of a position = the position notional ÷ equity. With an account of $5,000 and a position of 0.20 lot (20,000 units) the actual leverage is ×4, even if the account formally offers 1:500. It is the actual leverage that characterises the load on the account.
What is a margin call in simple words?
It is the state in which almost no free funds are left: the margin level has fallen to the broker's threshold. New positions cannot be opened, and a further move against you brings a forced close.
How does a stop-out differ from a stop-loss?
You place a stop-loss yourself at a chosen level, while a stop-out is initiated by the broker when the margin level falls below the threshold. The first is risk management, the second is its consequence when there was none.
Does high leverage increase risk?
Not directly. Risk is set by the size and the stop distance. But high leverage removes the natural limit on size: without it the account simply would not allow a position of that magnitude. That is why statistically elevated risk and high leverage do go together.
How much margin can be used at once?
A practical reference is up to 20–25 % of equity across all open positions. This is not about the size of the loss but about the buffer: the more funds are locked, the smaller the move after which positions start being closed by force.
Which leverage should a forex beginner choose?
Enough to open the size calculated from the risk with a buffer of free funds — usually 1:30…1:100. Higher leverage does not oblige you to trade larger, but it removes the natural limit on size, and that is exactly why it statistically goes together with elevated risk.
How is the margin level calculated and when is it dangerous?
Equity is divided by the used margin and multiplied by a hundred. A value of 1,000 % means a tenfold buffer, 100 % means there are almost no free funds. The margin call and stop-out thresholds are stated in the account specification and differ between brokers.
What is closed first at a stop-out?
As a rule the most losing of the open positions, but the order is written in the broker's regulations and may differ. It is not worth relying on it: a stop-out is the absence of risk management, not one of its tools.
Can an account go below zero?
On a sharp move that happens if the broker does not provide negative balance protection: positions are closed at the available prices rather than at the stop-out level. The presence of such protection is checked in the agreement before opening an account.
Does leverage affect the swap and the spread?
No, these are independent parameters. The swap depends on the rate differential and the direction of the trade, the spread on the instrument and the time of day. Leverage affects only the size of the locked margin.
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