You normally sell at the bid and buy at the ask. The difference is the bid-ask spread, an immediate execution cost rather than a prediction about market direction.
What are bid and ask prices?
A quote of 1.0849 / 1.0851 on EURUSD means the bid is 1.0849 and the ask is 1.0851. A market buy is offered near 1.0851; a market sell is offered near 1.0849. The spread is 0.0002, or two conventional pips for this four-decimal pair.
Investor.gov defines the bid price and ask price from the buyer's and seller's perspectives. In decentralised forex and broker-issued CFDs, the displayed quote is the broker or venue's executable quote under its terms, not one universal world price.
| Action | Side used | EURUSD example |
|---|---|---|
| Open a long with a market order | Ask | 1.0851 |
| Close that long immediately | Bid | 1.0849 |
| Open a short with a market order | Bid | 1.0849 |
| Close that short immediately | Ask | 1.0851 |
How does the bid-ask spread create a cost?
If you buy at 1.0851 and could instantly sell only at 1.0849, the position begins two pips negative before commission. With 100,000 EURUSD units, where a pip is USD 10 under the standard convention, that spread corresponds to about USD 20. At 10,000 units it is about USD 2.
The spread is not always fixed. It can widen around news, at rollover, in thin liquidity or during a gap. Our guide to what the spread is covers the cost in detail, while liquidity explains why the gap between buyers and sellers changes.
Commission, slippage, financing and currency conversion can sit beside it. A “zero commission” label does not mean zero cost.
Why can your fill differ from the displayed bid or ask?
The displayed top quote has a quantity behind it. If your order is larger than the amount available, it can consume multiple price levels. The market can also move between your click and the venue receiving the order. That difference is slippage.
Assume the ask shows 1.0851 for 20,000 units, the next ask is 1.0852 for 30,000, and the next is 1.0854 for 50,000. A 100,000-unit market buy would average (20,000×1.0851 + 30,000×1.0852 + 50,000×1.0854) ÷ 100,000 = 1.08529, before other costs. The best ask was real, but it was not available for the full size.
A market order prioritises execution, not price. A limit order sets a worst acceptable price but may not fill. A stop order is a trigger and can execute beyond its stop in a fast market. Read the separate slippage guide before treating a displayed quote as guaranteed.
Is bid/ask the same for gold, shares and futures?
The two-sided principle is the same; the market structure and units differ. An exchange order book aggregates orders under exchange rules. OTC forex can show dealer-specific quotes. A gold CFD may use a broker's contract and pricing source. Futures have standardised exchange contracts and minimum tick sizes.
For gold quoted 4,100.20 / 4,100.50, the spread is USD 0.30 per ounce in price terms. If the assumed contract represents 100 ounces, one full contract or lot has a USD 30 spread cost; 0.10 has USD 3. But contract definitions vary, so this is a calculation example, not a universal convention.
| Market | Quote still has bid/ask? | Key item to verify |
|---|---|---|
| Exchange share | Yes | Order-book depth and fees |
| Futures | Yes | Tick size, tick value, contract month |
| OTC forex | Yes | Dealer execution policy and lot units |
| Gold CFD | Yes | Contract size and pricing method |
What do bid and ask reveal about liquidity?
A narrow spread often indicates active competition and readily available liquidity; a wide spread can signal uncertainty or limited depth. But width alone is incomplete. A one-pip spread with only a tiny quantity can be worse for a large order than a two-pip spread with deep liquidity.
Watch the spread at the time you actually trade, not an advertised “from” number. Compare like with like: same symbol, session, account type, order size and news environment. If a broker offers guaranteed stops or fixed spreads, read the eligibility, premium and exception terms.
How should traders use bid and ask in risk calculations?
Place entry and exit assumptions on the correct side. A long trade opens at ask and its unrealised exit value is marked near bid. A short opens at bid and closes near ask. Chart candles may be built from bid, ask, midpoint or last trade depending on platform, so a stop can trigger even when the candle you are viewing appears not to touch it.
For a planned long entry ask 1.0851, stop trigger 1.0821 and two-pip spread, the headline distance is 30 pips. Add commission and a slippage scenario rather than assuming the maximum loss is exactly 30 pips. The broker's order and chart documentation should state which price triggers stops.
What is the practical checklist?
Confirm the quote order, contract size, pip or tick size, typical and stressed spread, chart-price basis, commission and execution policy. Use small size while checking that your platform marks long and short positions as expected.
Bid and ask are elementary terms, but misunderstanding them contaminates every later calculation: entry, break-even, stop distance, take profit, transaction cost and performance. Learn the two sides before judging any strategy result.
Sources
- Investor.gov, Bid Price
- Investor.gov, Ask Price
- CFTC, Retail foreign-exchange risk advisory
Trading carries high risk and you may lose your capital. Past performance does not guarantee future results. Educational only, not investment advice.
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