Pips and Lots: The Two Numbers That Set the Size of Everything

Ordering note. The v8 architecture listed "Bid/ask and spreads in FX" as #4 and "Pips and lots" as #5. Drafting found that ordering to be backwards: a spread cost cannot be stated in money without first establishing pip value, and attempting it produced an order-of-magnitude arithmetic error in #2 that had to be repaired before the cluster shipped. This article is therefore the cluster opener as #4, with spreads as #5; the swap was confirmed at QA and confirmed by Boss on 17 Aug 2026, and no other article is affected.

This article establishes both, gives the arithmetic explicitly so a reader can compute their own exposure, and states the figures the rest of the cluster depends on. It is deliberately mechanical: the numbers here are what make the spread and leverage articles meaningful rather than abstract.

The pip: a unit that is not a fixed size

A pip — conventionally the smallest standard increment in which a rate is quoted — is the unit everything in FX is discussed in. "The pair moved 40 pips" is how movement is described. The critical fact, and the one that generates the most expensive errors: a pip is not a fixed quantity. Its size depends on how the pair is quoted. For a pair quoted to four decimal places, one pip is 0.0001. For a pair quoted to two decimal places — which is conventional where one unit of the base buys a large number of quote units — one pip is 0.01, a hundred times larger. So comparing pip counts across pairs without knowing the pip size is meaningless. Fourteen pips on a two-decimal pair is not roughly ten times 1.2 pips on a four-decimal pair; as the pairs article showed, it can be nearly eighty times the cost. Anyone reading a platform's spread comparison across pairs without checking the quoting convention is reading a table that does not say what it appears to. Two further points. A pipette or fractional pip is a tenth of a pip, shown as a fifth decimal place on four-decimal pairs — platforms often quote these, which makes a spread look smaller than the pip figure suggests until you read the last digit. And a pip is not a percentage. One pip on a rate of 1.2500 is 0.0001 ÷ 1.2500 = 0.008% of the rate; one pip on a rate of 18.40 is 0.01 ÷ 18.40 = 0.054%. The same "one pip" is a different proportional move depending on the pair, which matters whenever you want to compare like with like.

The lot: how much is riding on each pip

A lot is a standardised position size, measured in units of the base currency. Three conventional sizes: standard = 100,000 units, mini = 10,000, micro = 1,000. Some platforms offer smaller still. Now the arithmetic, which is worth doing once by hand because it demystifies every figure that follows. Pip value in the quote currency is simply pip size × units. To express it in your own currency you then convert — where the base currency is the US dollar and you account in dollars, that means dividing by the rate:

Pip value (USD) = (pip size × units) ÷ rate

Applied to this pillar's canonical quotes, a standard lot gives $8.00 per pip on USD/MRD at 1.2500 — because 0.0001 × 100,000 = 10 marks, and 10 marks ÷ 1.2500 = $8.00 — and $54.35 per pip on USD/KSD at 18.40, because 0.01 × 100,000 = 1,000 drachms, and 1,000 ÷ 18.40 = $54.35. Note the size of that second figure and where it comes from: it is not that the drachm is riskier, it is that a pip on a two-decimal quote is a hundred times larger a step. Three consequences a reader should hold onto. Pip value scales linearly with lot size, so a mini lot is a tenth of the standard figure and a micro lot a hundredth — $0.80 and $0.08 respectively on USD/MRD. That linearity matters because position size is the variable a participant fully controls, unlike the rate, the spread, or the timing. Pip value also moves with the rate, since the conversion back into your own currency is done at a rate that changes — so pip value is not quite constant through the life of a position. And where neither currency in the pair is your own, an additional conversion applies and the pip value depends on a third rate. The number to internalise: on a standard lot of a four-decimal major, a hundred-pip move — under one percent of the rate (0.8% at 1.2500), an ordinary day's range in many pairs — is worth roughly $800. Not eight hundred cents. That is the scale retail FX operates at, and it is why the leverage article follows this one.

Pip-value reference

This pillar's canonical quotes, all three lot sizes, pip value expressed in US dollars. Figures computed rather than asserted; this table is the cluster's lookup.