Bid, Ask and Spread Explained: What You Really Pay to Trade

The bid is the highest price someone is currently willing to pay, the ask is the lowest price someone is currently willing to sell at, and the spread is the gap between them. When you buy you usually pay the ask, and when you sell you usually receive the bid, so a round trip costs you the spread even if the price has not moved. On a quiet, liquid market that cost is small, but it is never zero, and it grows quickly with trade size, trade frequency and poor market conditions.

This guide walks through what the bid, ask and spread are, why spreads exist, when they widen, how pips work in forex, and how to turn a spread into a dollar figure you can actually plan around. It is education, not financial advice. Trading involves a real risk of losing money, and understanding your costs does not change that. It just stops you losing money you did not need to lose.

Bid, ask and spread: the definitions

Every tradeable market has two prices at any moment, not one:

• Bid: the best price at which you can sell right now. It is the highest price a buyer is offering.
• Ask (also called the offer): the best price at which you can buy right now. It is the lowest price a seller is accepting.
• Spread: ask minus bid. It is always zero or positive in a normal market.
• Mid price: the halfway point between bid and ask. Many charts and price feeds show the mid or the last traded price, which is neither what you can buy at nor what you can sell at.

For example, if EUR/USD is quoted at 1.0850 / 1.0852, the bid is 1.0850, the ask is 1.0852, the spread is 0.0002 and the mid is 1.0851. If you buy, you pay 1.0852. If you then sold one second later with no price change, you would receive 1.0850. That 0.0002 difference is the spread cost.

A useful way to compare spreads across markets is as a percentage of the mid price: (ask minus bid) divided by mid. For the EUR/USD quote above, that is 0.0002 divided by 1.0851, or about 0.018%. A spread of $0.01 on a $2.505 token, by contrast, is about 0.40%, more than twenty times larger in relative terms.

Why spreads exist

The spread is not an arbitrary fee someone invented. It exists because buyers and sellers rarely arrive at exactly the same moment wanting exactly the same price.

Market makers and liquidity providers

Market makers are firms (and on some exchanges, individuals) who continuously quote both a price to buy and a price to sell. They stand ready to trade with you when no natural buyer or seller is available at that instant. In return, they aim to buy at the bid and sell at the ask, earning the difference over many trades. The spread is their compensation for providing immediacy and for the risk of holding a position while prices move against them.

Competition and liquidity

When many market makers and active traders compete in the same market, they undercut each other's quotes, and the spread gets tight. Major currency pairs and the largest cryptocurrencies on busy exchanges often have spreads that are a tiny fraction of a percent. When few participants are quoting, there is less competition and more risk for each one, so spreads widen. That is why small-cap tokens and exotic currency pairs usually cost more to trade.

In short, the spread is roughly a price for liquidity. The more liquid the market, the less you pay for the ability to trade immediately.

When spreads widen

Spreads are not fixed. They move with conditions, and the times they widen are often the times traders are most eager to trade.

• Around major news. In the seconds before and after an important release, such as a central bank rate decision or a major jobs report, market makers pull or widen quotes because the risk of being on the wrong side of a sudden move is high. Spreads on even the most liquid pairs can widen to several times their normal level for a short period.
• Low-liquidity hours. Forex spreads tend to be widest around the daily rollover (late afternoon New York time), when many participants are offline. Crypto order books often thin out overnight in the main trading regions.
• Weekends and holidays. The spot forex market is closed at weekends, and quotes can open on Sunday evening with wider spreads and a gap from Friday's close. Crypto trades through the weekend, but with fewer participants, so books are often thinner and spreads wider than on a busy weekday.
• Sharp moves and stress. When prices are falling or rising fast, liquidity providers step back, depth shrinks, and both the spread and slippage increase.
• Illiquid instruments. Small-cap tokens, exotic currency pairs and new listings can have wide spreads all the time, not just in unusual conditions.

Crypto order books versus forex dealer quotes

Where the spread comes from depends on how the market is structured, and crypto and forex are structured quite differently.

Crypto: the central limit order book

Most crypto exchanges run a central limit order book. Every resting buy and sell order is listed by price, and anyone can see the best bid, the best ask and the quantity behind each level. The spread is simply the gap between the highest resting buy order and the lowest resting sell order. You can join the bid or the ask yourself by placing a limit order, which means you can sometimes avoid paying the spread entirely, at the cost of possibly not getting filled. We cover that trade-off in market vs limit orders.

Forex: dealer and liquidity-provider quotes

Retail forex is mostly traded over the counter. Your broker shows you a bid and an ask that it either sets itself (as a market maker) or passes through from a group of banks and liquidity providers, often with a markup added. You usually cannot see a full order book, and you cannot usually place an order inside the spread in the way you can on a crypto exchange. Some brokers offer raw spreads from their liquidity providers plus a separate commission, while others offer a wider spread with no commission. Both models are common, and neither is automatically cheaper.

For a broader comparison of how these two markets work, see crypto vs forex trading.

Pips and how forex spreads are measured

Forex spreads are quoted in pips. For most currency pairs, a pip is the fourth decimal place, 0.0001. For pairs quoted against the Japanese yen, a pip is the second decimal place, 0.01. Many brokers also show a fifth (or third, for yen pairs) decimal, called a fractional pip or pipette, which is one tenth of a pip.

Pip value in dollars

For pairs where the US dollar is the second currency (the quote currency), such as EUR/USD, the value of one pip is easy to work out: multiply 0.0001 by the position size in units of the base currency.

• Standard lot (100,000 units): 0.0001 × 100,000 = $10 per pip
• Mini lot (10,000 units): 0.0001 × 10,000 = $1 per pip
• Micro lot (1,000 units): 0.0001 × 1,000 = $0.10 per pip

For pairs where the dollar is not the quote currency, the pip value is in the quote currency and has to be converted. For USD/JPY, one pip on 100,000 units is 0.01 × 100,000 = 1,000 yen. At a rate of 150.00, that is 1,000 ÷ 150 = about $6.67.

Calculating what the spread costs you

The spread is paid over a round trip: you buy at the ask and sell at the bid. Measured from the mid price, you give up half the spread when you enter and the other half when you exit. The total is one full spread per round trip.

Worked example: EUR/USD

EUR/USD is quoted at 1.0850 / 1.0852, a spread of 2 pips. You buy one standard lot (100,000 euros) at the ask of 1.0852.

1. Spread in price terms: 1.0852 minus 1.0850 = 0.0002, which is 2 pips.
2. Pip value on a standard lot: $10.
3. Spread cost for the round trip: 2 pips × $10 = $20.
4. Check: buying 100,000 euros at 1.0852 costs $108,520. Selling them straight back at 1.0850 returns $108,500. The difference is $20.

The same 2-pip spread costs $2 on a mini lot and $0.20 on a micro lot. It also means the bid has to rise 2 pips, from 1.0850 to 1.0852, before you could close the trade at break-even. Every trade starts slightly behind.

For USD/JPY quoted at 150.00 / 150.03, the spread is 3 pips. On 100,000 units that is 3 × 1,000 yen = 3,000 yen, which at about 150 yen per dollar is roughly $20.

Worked example: a crypto token

A token is quoted at $2.500 bid and $2.510 ask on an exchange, a spread of $0.010. You buy 4,000 tokens at the ask.

1. Cost to buy: 4,000 × $2.510 = $10,040.
2. Value if sold immediately at the bid: 4,000 × $2.500 = $10,000.
3. Spread cost for the round trip: $10,040 minus $10,000 = $40, which is 4,000 × $0.010.
4. As a percentage of the mid price ($2.505): $0.010 ÷ $2.505 = about 0.40%.

Adding fees to the picture

Now suppose the exchange charges a 0.1% taker fee on each side. The entry fee is 0.1% of $10,040, which is $10.04. The exit fee is 0.1% of $10,000, which is $10.00. Total fees are $20.04. Add the $40 spread and the round trip costs $60.04, or about 0.6% of the position, before the price has moved at all. To break even, the bid would need to rise from $2.500 to roughly $2.515.

Repetition is where costs really bite. Twenty round trips in a month on one standard lot of EUR/USD at a 2-pip spread is 20 × $20 = $400 in spread alone. That is a real hurdle your trading has to clear before it makes anything.

Fees vs spread vs slippage

These three costs are easy to confuse, but they come from different places and show up differently on your statement.

• Fees and commissions: explicit charges from the exchange or broker, usually a percentage of the trade value or a fixed amount per lot. They are listed on your trade confirmation.
• Spread: the gap between the bid and ask at the moment you trade. It is built into the price, so it rarely appears as a separate line item, but it is a real cost.
• Slippage: the difference between the price you expected and the price you got, usually because your order was larger than the quantity at the best price or because the price moved while the order was being filled. It can be positive occasionally, but it tends to hurt more often than it helps, especially with market orders.

A zero-commission offer does not mean zero cost. Brokers that do not charge a commission typically earn through a wider spread. When comparing venues, look at the total: spread plus commission plus typical slippage for the size you trade. As an illustration using hypothetical numbers, an account with a 1.2-pip spread and no commission costs $12 per standard lot round trip on EUR/USD, while an account with a 0.2-pip spread plus a $7 round-trip commission costs $2 + $7 = $9. The cheaper-looking account on paper is not always the cheaper one in practice.

Forex positions held overnight can also incur swap or rollover charges, and crypto perpetual futures carry funding payments. These are separate from the spread, but they belong in the same total-cost calculation if you hold positions for more than a day.

Reading prices on a price display

Many websites and apps show a single price per market, which is usually a last traded price, a mid price or a reference rate, not a live bid and ask. Zenith Tradings, for example, labels every price with its source and delay: crypto prices come from Binance spot and may be cached for up to 60 seconds, and forex prices are the European Central Bank's daily reference rates. Those are useful for understanding where a market is, but they are not quotes you can trade at. Before you trade, always check the live bid and ask on the venue where your order will actually be filled.

The same applies to charts. A candlestick chart is usually drawn from bid prices, mid prices or last trades, depending on the platform, so the high and low you see may not match the prices you could actually have bought or sold at. If you are new to charts, start with how to read candlestick charts.

Common mistakes

• Assuming no commission means free. The spread is still there, and on some accounts it is wider precisely because there is no commission.
• Judging cost from the tightest quote. Spreads during busy hours are not the spreads you get at the rollover, on a Sunday open or during a news release.
• Ignoring spread on small targets. If you aim to make 5 pips and the spread is 2, the spread is 40% of your target. Short-term strategies are especially sensitive to spread.
• Placing stops too close. A stop a few pips from entry can be triggered by a brief spread widening, even if the mid price barely moves.
• Trading illiquid markets with market orders. Wide spreads plus thin depth mean paying both the spread and slippage.
• Forgetting the exit. You pay half the spread going in and half coming out. Budget for the whole round trip.

Key takeaways

• You buy at the ask and sell at the bid. The spread is the gap, and a round trip costs one full spread.
• Spreads exist because liquidity providers are paid for offering immediacy and taking risk.
• Spreads widen around news, in quiet hours, at weekends and in stressed or illiquid markets.
• On EUR/USD, 1 pip is 0.0001 and is worth $10 on a standard lot, so a 2-pip spread costs $20 per round trip.
• Total trading cost is spread plus fees plus slippage, and for held positions, financing too.
• Knowing your costs helps you avoid unnecessary losses, but it does not make any strategy profitable. Trading can lose money.

Once you start converting spreads into dollars, you see your trading differently. Small edges disappear quickly under real costs, and the habit of checking the live bid and ask before every trade is one of the cheapest improvements a trader can make.