Direct answer
In forex, spread usually means the bid–ask spread: the difference between the bid price and the ask price for a currency pair. The bid is the price at which a dealer/market is willing to buy the base currency, while the ask is the price at which it is willing to sell. Because the ask is higher than the bid, the spread represents a built-in cost when you enter or exit a trade.
How spread works (the mechanics)
Forex prices are often shown as two numbers. For example, a quote might look like X / Y where the first number is the bid and the second is the ask (or vice versa, depending on the quote format). The spread is the numerical difference between those two values.
Key points to understand:
- You buy at the ask and you sell at the bid (in simplified terms). That means your execution happens at different sides of the quote.
- The spread can be quoted in “pips” (a common measure of price movement in forex). Whether your platform shows pips or raw price decimals, the idea is the same: it is the bid–ask gap.
- Spread is not the same as volatility, but it can widen when markets are moving quickly or when there are fewer willing buyers/sellers (lower liquidity).
Example checks
If a currency pair shows bid = 1.2000 and ask = 1.2002, the spread is 0.0002 (which may correspond to 2 pips, depending on the pair’s pip convention). A tighter quote might show 1.2000 / 1.2001, where the spread is smaller.
Independent checks you can do without any assumptions about future price:
- Compare the current bid–ask gap with the recent bid–ask gap to see whether the spread is widening or narrowing.
- Check whether spreads change during known periods of reduced liquidity (for example, when trading conditions are calmer versus when many participants are active). Your exact observation will depend on the instrument and venue.
Limitations and what cannot be concluded
- Spread is a present quote detail, not a prediction. A wider spread today does not by itself imply a specific future outcome.
- Spreads can vary by broker/platform, account settings, and market conditions. Two traders looking at different venues may see different spreads for the same pair.
- “The spread” alone does not tell the full cost. Other execution-related factors (such as commissions, if applicable, and how quickly orders are filled) can also affect what you actually pay, even if you understand the bid–ask gap.
Because there are no guarantees in live markets, treat spread as a measurable quote characteristic that affects transaction cost and execution pricing, while recognizing that liquidity and quoting behavior can change over time.