Lot Size, Contract Size and Tick Value: FX and Crypto Basics

Start with the market itself

Foreign exchange — FX for short — is the business of swapping one currency for another. It is enormous. The Bank for International Settlements, which coordinates a global survey with central banks every three years, put average daily over-the-counter FX turnover at $9.6 trillion in April 2025, up 28% from $7.5 trillion three years earlier. "Over-the-counter" simply means trades arranged between parties rather than on a public exchange.

That scale matters for a practical reason: it is why so many pairs trade with tight spreads, and why a lot of the plumbing — contract sizes, tick values, minimum increments — is standardized. When you place a trade, you are not choosing a number out of thin air. You are choosing how many standardized bundles you want.

Pips: the smallest step a price takes

A pip is the smallest conventional price move in a currency pair. For most pairs it is measured at the fourth decimal place — 0.0001 — while pairs involving the Japanese yen are measured at the second decimal place, 0.01. Many modern platforms quote an extra digit, sometimes called a pipette or fractional pip, which is one tenth of a pip.

Think of a pip as the ruler, not the money. A pip tells you how far price moved. It says nothing yet about what that movement is worth to you. That is where lot size walks in.

Lot size and contract size: the multiplier

A lot is the standard unit of trade volume, and contract size is how many units of the base currency one lot represents. In FX, a standard lot is 100,000 units of the base currency. Split it down and you get a mini lot at 10,000 units, a micro lot at 1,000 units, and — on some platforms — a nano lot at 100 units, often used on cent accounts.

Once you combine a pip with a lot, you get pip value. On EUR/USD, one pip is worth roughly $10 on a standard lot, about $1 on a mini lot, and about $0.10 on a micro lot. Read that again, because it is the whole point: the same one-pip move costs or earns you one hundred times more on a standard lot than on a micro lot.

This is why experienced traders often talk about position sizing before they talk about strategy. A perfectly reasonable view on the market, expressed in a lot size that is too large for the account, stops being a view and becomes a gamble. Among the sources reviewed here, one recurring rule of thumb for risk per trade is 1–2% of account balance — a heuristic, not a law, and not a guarantee of anything.

Tick value, and why the arithmetic is fiddly

Tick value is the money value of one minimum price increment for a given position size. In FX it is the pip value. The complication is that pip value depends on three things at once: the pair, the lot size, and your account currency.

The simplest case is a USD-quoted pair like EUR/USD in a USD account, where the pip value is fixed and easy to remember. Yen pairs behave differently because the pip sits at the second decimal place, so a standard lot of USD/JPY produces a pip value that depends on the exchange rate — historically in the region of $7–$9 per pip, not a flat $10. Pairs where the quote currency is not your account currency need an extra conversion step, so GBP/USD read with EUR/USD logic will give you the wrong number.

Small errors here compound. A trader who sizes a position assuming $10 per pip when the real figure is nearer $0.10 is not taking a small position. They are taking a large one and calling it small.

Minimum increments: the granularity problem

Here is the part that surprises people. You cannot trade any size you like. You trade in increments — often 0.01 lots as a minimum, sometimes 0.001. That floor creates a genuine tension: on a small account, the smallest position available may already be larger than your intended risk.

Suppose your plan says risk 2% of a $500 account with a 50-pip stop. That is $10, and at $0.10 per pip it works out to about two micro lots. Fine. Now run the same plan on a $100 account with a tight stop and the arithmetic may point to a fraction of a lot that does not exist. The honest answer is not to round up and hope. It is to recognise that the instrument's minimum size does not fit the account, and to either trade a smaller-increment instrument or not take that trade. Not every worthwhile idea is a size you can actually wear.

Costs work the same way. The spread is the gap between the bid and ask price, and a wider spread effectively increases your risk per trade — which, in principle, argues for a smaller position for the same risk budget. Spreads typically widen during low-liquidity periods and around major news. Leverage, by contrast, does not change pip value at all; it only changes the margin you must post to hold the position.

Crypto: same idea, looser rules

Crypto markets borrow this vocabulary but are less standardized. Spot crypto is generally quoted in coins or tokens, and contract sizes vary by venue and by product — a perpetual futures contract at one exchange may represent a different notional amount than the "same" contract elsewhere. Tick size, the smallest price increment, also varies by venue, and many platforms allow fractional quantities, while others impose minimum order sizes and minimum notional values.

The consequence is that you cannot carry an FX pip value across to crypto and assume it holds. The underlying logic transfers — position size × price increment = money at risk — but the inputs must be read from each venue's own contract specifications.

This is also where jurisdiction matters, and it matters a lot. In the United States, the Commodity Futures Trading Commission regulates off-exchange retail foreign currency transactions, and only certain regulated entities may act as counterparties to retail customers — registered futures commission merchants and retail foreign exchange dealers, with rules covering registration, disclosure, minimum capital and conduct. The National Futures Association's guidance for members notes that customers must receive risk disclosure before an account is opened, that promotional material may never guarantee against loss, and that firms may not present hypothetical performance as though it were real. Rules differ by country, so what is permitted where you live may not match what you read online.

What this means in practice

Three habits follow from all of this. First, learn your instrument's contract size and tick value before you size anything — not after. Second, work backwards from risk: decide how much you are willing to lose, then let the stop distance and the tick value produce the lot size, rather than picking a lot size and discovering the risk afterwards. Third, be honest about the minimum increment. If the smallest trade available is bigger than your plan allows, the market is telling you something useful.

None of this predicts outcomes, and nothing here is a recommendation for your situation. It is simply the arithmetic that sits underneath every position you will ever open — quiet, unglamorous, and the reason two traders with identical views can end up in completely different places. Getting the small numbers right is not the exciting part of trading. It is, however, the part that keeps you around for the interesting parts.