Forex uses its own measurement system for price, position sizing, and costs. Before placing your first currency trade, you need to understand these terms because they determine what you earn, what you risk, and what you pay on every transaction.

How a forex quote works

Every forex quote shows the price of one currency in terms of another. In EUR/USD at 1.0850, one euro costs 1.0850 U.S. dollars. The first currency listed (EUR) is the base currency. The second (USD) is the quote currency.

When you buy EUR/USD, you're buying euros and selling dollars. When you sell EUR/USD, you're selling euros and buying dollars. The quote tells you the exchange rate for that transaction.

What a pip is

A pip (percentage in point) is the standard unit of measurement for price changes in forex. For most pairs, one pip equals the fourth decimal place. If EUR/USD moves from 1.0850 to 1.0851, it moved one pip.

Japanese yen pairs are the exception. Because the yen trades at a much higher numerical value against other currencies, yen pairs use two decimal places. If USD/JPY moves from 155.00 to 155.01, that's one pip.

Some platforms show a fifth decimal place (or third for yen pairs), called a pipette or fractional pip. A move from 1.08500 to 1.08501 is one-tenth of a pip. This extra precision matters for traders monitoring costs and execution down to the fraction.

How pip value translates to dollars

The dollar value of a pip depends on your position size and the pair you're trading. For EUR/USD, one pip on a standard lot (100,000 units) equals $10. On a mini lot (10,000 units), one pip equals $1. On a micro lot (1,000 units), one pip equals $0.10.

This means a 50-pip move on a standard lot position in EUR/USD generates a $500 gain or loss. The same 50-pip move on a micro lot produces $5. Understanding this relationship is essential for sizing positions to match your risk tolerance.

Lot sizes

Forex positions are measured in lots. A standard lot represents 100,000 units of the base currency. If you buy one standard lot of EUR/USD, you're buying 100,000 euros.

Most retail traders use mini lots (10,000 units) or micro lots (1,000 units) to keep position sizes manageable relative to their account. Some platforms also offer nano lots (100 units) for even smaller position sizing.

Choosing the right lot size determines your risk per trade. Before entering a position, calculate how many pips your stop-loss is from your entry, multiply by the pip value for your lot size, and confirm that the potential loss is within your risk parameters.

What the spread costs you

The spread is the difference between the bid price (what you can sell at) and the ask price (what you can buy at). If EUR/USD shows a bid of 1.0849 and an ask of 1.0851, the spread is 2 pips.

Every time you enter a trade, you effectively pay the spread as a transaction cost. You buy at the ask and can only sell at the bid, so the price needs to move in your favor by at least the spread amount before you break even.

Spreads are tightest on major pairs during active trading sessions. EUR/USD typically shows a spread of 0.1 to 0.5 pips during London and New York hours. Exotic pairs can have spreads of 10 pips or more. Spreads also widen during low-liquidity periods, around major news events, and during session transitions.

Putting it together

A practical example: you buy one mini lot of EUR/USD at 1.0851 (the ask). The bid is 1.0849, so the spread is 2 pips. Your position is immediately showing a 2-pip unrealized loss ($2 on a mini lot) because the spread is your cost of entry.

EUR/USD rises to 1.0901. You sell at the bid of 1.0899. Your gross profit is 48 pips from your adjusted starting point (1.0851 to 1.0899), which equals $48 on a mini lot. Your net profit after the spread is $48.

Before every trade, know your pip value, your spread cost, and how many pips you're risking. These numbers define the economics of every position you take.