Spread

Definition

The spread is the difference between the bid price (sell) and the ask price (buy) of a currency pair. It represents the broker's fee and is measured in pips. Tighter spreads mean lower trading costs. Spreads can be fixed or variable depending on the broker and market conditions. Major pairs like EUR/USD typically have the tightest spreads.

Further reading: Spread

Spread is the difference between a currency pair's ask (buy) price and bid (sell) price, quoted in pips or pipettes. It represents the immediate transaction cost you pay when opening and closing a position and may include broker markups; some brokers instead charge a commission plus raw spreads. Example: if EUR/USD bids at 1.10000 and asks at 1.10020, the spread is 2.0 pips (20 pipettes). For a standard 100,000 lot on EUR/USD, 2.0 pips roughly equals $20. Spreads vary by instrument and market conditions—majors tend to have tight spreads, exotics wider ones—and can be fixed or variable. Spreads commonly widen during news, low liquidity, or volatile markets. Treat the spread as a trading cost when calculating break‑even points and position sizing; it is one factor among many that influence net returns and does not guarantee profits.

Spreads appear everywhere in forex trading: on quote screens, chart tick labels, order-entry dialogs, and in execution reports. They directly affect execution price: an entry occurs at the ask and exits at the bid, so the spread is an immediate drag on returns. Spreads are influenced by liquidity providers, the trading venue (ECN, STP, market maker), and market hours; for example, spreads are usually narrow during London/New York overlap and wider in Asian hours. News releases, economic data, and market stress cause temporary widening. Traders monitoring intraday strategies, scalpers, or automated systems must watch live spreads because larger spreads increase slippage, change risk/reward, and can convert winning trades into losing ones even if the market moves as expected.

Automated strategies (EAs) incorporate spread in many ways: as a cost to subtract from profit targets and add to stop distances, as a filter to avoid entries when spreads exceed a safe threshold, or as an input to break‑even and risk calculations. EAs often check real-time spread and cancel or postpone orders if the spread spikes—e.g., skip trades when EUR/USD spread > 1.5 pips. During backtesting and optimization, using historical, tick-level spreads or representative variable spreads produces realistic performance. Some EAs adapt lot size or trading frequency based on average spread to control execution cost. Careful spread handling improves robustness but does not guarantee profitability.

Frequently Asked Questions

How do I calculate the cost of the spread on a trade?

Calculate spread cost by converting the spread in pips to monetary value for your position size. Example: EUR/USD spread 0.2 pips (0.00002); on a standard 100,000 lot one pip ≈ $10, so 0.2 pips ≈ $2. For mini and micro lots scale accordingly. Include any commissions separately if your broker charges them.

Why do spreads widen during news or off hours?

Spreads widen when liquidity decreases or volatility rises. During news, market makers and liquidity providers protect themselves against fast price moves by increasing spreads; during off hours fewer participants mean thinner order books and larger gaps between bid and ask. Wider spreads reflect higher execution risk and cost.

Should my EA avoid high-spread periods?

Many EAs include a spread threshold to avoid executing during expensive conditions. Skipping trades when spreads exceed a preset limit (e.g., >1.5 pips on EUR/USD) reduces execution cost and slippage risk. Whether to skip depends on strategy horizon: scalpers are more sensitive than long-term trend systems.

What's the difference between fixed and variable spreads?

Fixed spreads remain constant regardless of market conditions but may include markups; they can widen through re-quotes under stress. Variable (floating) spreads change with liquidity and volatility—tighter in liquid periods, wider during news. Brokers offering raw variable spreads often charge separate commissions.