Lot size, and how a position gets its name

The volume field on a ticket is a name, and names are useless until you know the unit they refer to. Two account holders can both say they opened "one lot" and be describing exposures that differ by a factor of ten or a hundred, because their firms, or their account settings, do not mean the same count of currency by that word. A lot, in the retail currency convention that most platforms still teach, is a fixed quantity of the base currency. The common standard lot is 100,000 units of the base. A mini lot is often 10,000, and a micro lot is often 1,000. Those are conventions, widely used and not universal. The contract specification for the symbol, not the habit of a forum, says how many units one lot contains on that platform. Until you have opened that specification, the number in the volume field is a nickname.

Read the specification as a short table you could copy onto a card. It should state the contract size, the base currency, the quote currency, the minimum volume, the volume step, and sometimes the margin requirement for that symbol. If the contract size is 100,000, then a volume of 1.00 is 100,000 units of the base, a volume of 0.10 is 10,000, and a volume of 0.01 is 1,000. If the contract size is already 1,000, then a volume of 1.00 is a much smaller position, and calling it "one lot" in a conversation with someone on the other convention will produce nonsense. Write the contract size into the journal every time you trade a symbol you have not recorded before, and again if the firm changes the specification. A screenshot of the specification, dated, is better than a memory of what "micro" meant at a previous broker. The statement's volume column will not repeat the contract size on every row. It assumes you still know.

Once the units are known, the position can be described in a sentence a stranger can audit. "Bought 0.20 volume of the pair, contract size 100,000, so 20,000 units of the base, filled at the price on the ticket." That sentence contains no recommendation. It contains an identity. The profit or loss in the quote currency, before conversion and before commission and swap, is the change in price multiplied by those units, with the sign flipped if the position was a sale of the base rather than a purchase. A price move of 0.0010, one hundred pips where a pip is 0.0001, on 20,000 units, is 200 units of the quote currency, because 0.0010 times 20,000 equals 200. If the quote currency is the account currency, that 200 is already in the money of the account, commissions and swap aside. If it is not, the firm converts, and the statement's profit is the converted amount. The arithmetic is how you check a row. It is not a suggestion about how many units anyone ought to hold.

Pip value is the same arithmetic said in the other direction. People ask what one pip is "worth" because they want the price scale translated into the account currency for a given size. For a pair in which a pip is 0.0001 and the quote currency is the account currency, one pip on 100,000 units is 10 units of account currency, because 0.0001 times 100,000 equals 10. On 1,000 units the same pip is 0.10. The worth of a pip is therefore not a property of the pair alone. It is a property of the pair and the position size and the currency in which the account keeps score. Change the size and the pip value changes in proportion. Change the account currency and a conversion stands between the quote-currency result and the number you see. A journal that records "I risked twenty pips" without recording the units has not recorded an amount of money. Twenty pips on a micro lot and twenty pips on a standard lot are different events that happen to share a word.

Partial closes make the name of the position change through time, and the statement is often clearer about this than the memory is. A ticket opened at 0.50 and closed in two pieces, 0.20 and then 0.30, may appear as two closing rows, or as one row with a comment, depending on the platform. The remaining exposure after the first close is 0.30 of volume, not "the position, mostly still on." If you hedge, meaning the account is allowed to hold a buy and a sell in the same pair at the same time, you may have two tickets whose net units are small while the gross units are large. Financing, commission, and margin treatment of hedged tickets vary by firm. Netting accounts collapse the exposure into one position, so a new order in the opposite direction reduces or flips the original rather than sitting beside it. The statement of a netting account and the statement of a hedging account do not tell the same story from the same clicks. Write down which mode the account uses before you try to explain a row to yourself a month later. "I closed" can mean "I sent an opposite order" on one platform and "I reduced the net" on another.

The volume step and the minimum volume are part of the name as well, because they decide which sizes can exist. If the step is 0.01 lot and the contract size is 100,000, you cannot hold 250 units; the nearest names are 0.00, which is nothing, and 0.01, which is 1,000 units. Orders that ask for a size the symbol does not list are rejected or rounded, and a rejection is a fact the record should include. A rounded fill that you did not notice will not match the size you wrote in a plan. Some symbols also impose a maximum volume per ticket and a maximum aggregate exposure per account. Those limits are contractual. They are not advice about the sensible size relative to your savings. A platform that accepts a huge volume has not judged the volume appropriate to the deposit. It has judged the volume within its own limit. The appropriateness question is answered, if it is answered at all, by comparing the possible loss in account currency to the cash that can actually be lost, using the pip value you computed from the specification.

Naming the position the same way in every document is what makes a journal and a statement able to meet. Pick a canonical description and use it without variation: pair codes in base/quote order, direction as buy or sell of the base, volume as printed, contract size in units, fill price, and account currency. Avoid nicknames inside the record. A slang name for a pair, a pet name for a setup, or the phrase "a small one" will not survive contact with a CSV export. The export will say 0.02. If your note says "small," you cannot search, you cannot sum, and you cannot explain the row to a tax preparer or to your own later self. Consistency is dull on purpose. A record is a set of keys. When the keys match, you can ask whether the cash result matches the price difference times the units. When the keys do not match, you will spend the evening deciding whether two rows are the same event.

Size also decides how much of the account a given price move can reach, which is why the name of the position belongs next to the margin figure and not only next to the entry. A one-pip move that is pocket change on a micro lot is a large fraction of a small deposit on a standard lot. Nothing about the word "lot" conveys that until the contract size and the deposit are in the same sentence. People speak of dropping to a smaller lot as if the smaller name were automatically a modest risk. It is automatically a smaller exposure than a larger lot on the same symbol at the same firm. It is not automatically modest. Modest is a comparison with the cash in the account and with the distance the price can travel, including gaps when the market reopens. A correctly named 0.01 can still be too large for a tiny balance if the pair moves a long way, and a correctly named 1.00 can be a small fraction of a very large balance. The name makes the comparison possible. It does not perform the comparison for you.

Keep the specification, the volume, and a one-line unit count with the ticket identifier. When the statement arrives, the identifier is how you join your sentence to the firm's row. If the units you computed do not equal volume times contract size, stop and repair the note before you interpret the profit. A profit that looks large may be the ordinary pip value of a size you had not translated into units. A profit that looks tiny may be a micro contract you remembered as a standard one. The repair is arithmetic. It does not require a view about where the price should have gone. Most of the confusion people attribute to the market, when they cannot explain a single row, is a confusion about the name of the position.

This site does not set contract sizes, and it is not a broker. It does not open tickets, choose volumes, or hold the deposit behind them. Naming a lot cleanly does not make the position safe and does not make the outcome repeatable. Whatever count of units the ticket shows, an adverse move in the currency price can wipe the deposit that was posted to hold that position. The use of a precise name is narrower than that, and more reliable: it lets you point at a row and say how much currency the row was about, in units a second person can multiply.

This page is general information. It is not a policy, a diagnosis, a school place, or a trade.