What margin level is

A percentage, not an amount 

The calculation has three steps and no fourth one. Equity is divided by used margin. The result is multiplied by one hundred. The answer is printed with a percent sign. Nothing else enters it: not the balance, not the free margin, not the number of positions open, not the instruments they are written on.

Because both terms of the fraction are money amounts in the same currency, the currency cancels and what survives is a pure proportion. That is the whole point of the field. Two accounts of very different sizes can be compared on it directly, and the same account can be compared against itself last week, because the figure describes a relationship rather than a quantity. A money amount says how much. A margin level says how much, against how much is committed.

Read plainly, the percentage answers one question: how many times over does the account currently cover what is held against its open positions. A level of one hundred percent means the two figures are equal, so equity covers used margin exactly once and no more. Above that, equity is the larger of the two. Below it, equity has fallen under the amount being held, which is a state the mechanism described later in this module is built to prevent from persisting.

The two rows read together make the field's one genuine virtue visible. Nothing about the positions changed between them. The instruments are the same, the sizes are the same, the amount held is the same to the cent, and the percentage is nonetheless very different, because the percentage is not describing the positions at all. It is describing the account that is carrying them.

The top of the fraction moves every tick 

Equity carries the unrealised result of every open position, so it is restated on every price update while anything is open. Margin level inherits that behaviour whole. The figure on the panel is therefore never a settled number: it is recalculated as fast as the prices underneath it change, and it moves in the opposite direction to an adverse move and in the same direction as a favourable one.

The bottom of the fraction moves as well 

The denominator is not a constant either. Used margin grows every time a position is opened and shrinks every time one is closed, and on instruments whose requirement is worked out from the prevailing price it is recalculated as the market moves. Because it sits underneath the fraction, growth in used margin pulls the percentage down even when equity has not moved by a cent.

The block shows the second of the two routes down, and it is the one that surprises people, because nothing in it went wrong. No price moved against the account. Nothing was lost. Every position was opened deliberately and every one of them is flat. The percentage fell by three quarters purely because the account committed more of itself, which is the sense in which the field measures commitment rather than performance.

The two routes are independent, and they compound when they arrive together. An account whose positions are losing while it opens further ones is shrinking its numerator and growing its denominator at the same time, and the percentage falls faster than either movement on its own would explain. That combination is what the two worked scenarios at the end of this module are built to trace step by step.

When nothing is open 

An account with no open positions has no used margin, and a fraction cannot be divided by nothing. The field is undefined rather than infinite, and platforms handle that by printing a dash, a zero or nothing at all depending on the terminal. None of those readings means the account is in difficulty and none of them means it is not. It means there is no commitment for equity to be measured against, so the question the field asks does not currently apply.

The number the mechanism reads 

Every other field on the panel is a money amount, and a money amount cannot carry a threshold that works for more than one account. A rule written as a fixed sum would bind a large account and a small one completely differently. A rule written as a percentage binds both identically, which is why the thresholds that govern open positions are set on this field and not on equity or free margin.

Two such thresholds exist, and both are stated as margin levels. The higher of them is the margin call, a warning state entered when the percentage falls to a stated figure, and it is the subject of the lesson immediately after this one. The lower is the stop out, the level at which the platform begins closing open positions itself rather than waiting. At YAL that stop out level is a margin level of 50%, and how the closing sequence proceeds once it is reached is the lesson after that. Neither threshold is a suggestion, a preference or a setting: both are conditions the server evaluates continuously against this one number.

Two limits of the field follow directly from its construction, and both matter more than they first appear. It is a snapshot of the present and predicts nothing, so a percentage that is high now says nothing about what it will be after the next price update. And it does not describe how far equity can fall, because profit and loss are calculated on the full contract value rather than on the amount held against it, so an adverse move can exhaust used margin entirely and losses are not limited to the amount deposited.

Where the figure appears 

A YAL account runs on one of two platforms, MetaTrader 5, and both print this percentage in the same summary as the fields it is derived from. On MetaTrader 5the terminal's trade tab lists it beneath margin and free margin, labelled margin level, with the percent sign attached to the value. The figure is calculated on the server and pushed to the terminal rather than worked out locally.

Recomputing it by hand from the two fields printed beside it can land a little away from the figure on screen. Each term is converted into the account's currency and rounded before the division is taken rather than after, so a small discrepancy of that kind is the rounding and not an error in either number. The server's figure is the operative one, and it is the one the thresholds are evaluated against.

Where practitioners disagree 

There is a long running argument about how much weight this one percentage should carry. One tradition treats it as the headline figure of an account, on the grounds that it is the number the close out mechanism actually reads, and that a figure the system acts on is worth more attention than figures nothing acts on. The reasoning is hard to fault on its own terms.

The objection is equally concrete. A percentage compresses two independent quantities into one, so it cannot be decompressed by looking at it: the same figure can describe a small account holding a small commitment or a large account holding a large one, and the two behave very differently when a market gaps. It is also silent about what would move it. Nothing in the number states how far price would have to travel to halve it, because that depends on the sizes and the instruments, which have already been divided out. Traders who hold this view read it alongside the money amounts rather than instead of them.

Both positions are describing the same property from opposite ends and neither has settled the argument. The field is unambiguous about one thing and silent about another. It states exactly where the account currently sits relative to the thresholds that govern it. It states nothing at all about how quickly it could arrive at them.