Direct Answer
A currency pair such as EUR/USD quotes how many units of the quote currency (USD) buy one unit of the base currency (EUR). A pip is the conventional smallest price move, typically 0.0001 for most pairs and 0.01 for JPY pairs. Pip value in money depends on position size and which currency the pip is denominated in. Total trading cost is spread plus commission plus slippage plus financing. Rollover credit or debit reflects the interest-rate differential between the two currencies, adjusted by the dealer's own terms.
Currency Pairs, Pips, Spreads & Rollover
Understanding a forex quote is step one. Converting that quote into a real cost in your account currency, and then accounting for the cost of carrying a position overnight, are steps two and three. Many traders focus almost exclusively on step one and then discover that the economics of a trade, including spread, commission, slippage and rollover, were different from what the chart suggested. This guide works through each layer in order.
Base currency and quote currency
Every currency pair names two currencies in a specific order. The first is the base currency. The second is the quote currency. The displayed price tells you how many units of the quote currency one unit of the base currency is worth at that moment.
For EUR/USD: EUR is the base, USD is the quote. A price of 1.1682 means one euro is currently worth 1.1682 U.S. dollars. If EUR/USD moves from 1.1682 to 1.1700, the euro has appreciated relative to the dollar. If it moves from 1.1682 to 1.1650, the euro has weakened relative to the dollar.
For USD/JPY: USD is the base, JPY is the quote. A price of 157.30 means one U.S. dollar is worth 157.30 Japanese yen. If USD/JPY rises, the dollar is gaining against the yen. If USD/JPY falls, the dollar is losing against the yen.
This notation is a convention. The same economic relationship written USD/EUR would tell you the dollar price of one euro instead of the euro price of one dollar. The market has settled on conventional notations, but you should always confirm which convention a platform uses before entering a trade.
What is a pip?
A pip (short for "percentage in point" or "price interest point") is the conventional unit of price movement for a currency pair. For most pairs quoted to four decimal places, such as EUR/USD, GBP/USD or AUD/USD, one pip equals 0.0001. For pairs involving the Japanese yen, such as USD/JPY or EUR/JPY, which are quoted to two decimal places, one pip equals 0.01.
Calculating pip value
The pip value in your account currency depends on three things: position size, pip size, and the quote currency.
When the quote currency is USD (e.g., EUR/USD): each pip is worth a fixed amount per unit of the base currency. Pip value per unit = pip size (0.0001). For a position of 100,000 EUR (one standard lot), pip value = 100,000 x 0.0001 = $10 per pip.
When the quote currency is not USD (e.g., USD/JPY): each pip is denominated in JPY. To convert to USD, divide by the current exchange rate. If USD/JPY is 157.30 and you hold 100,000 USD, pip value in JPY = 100,000 x 0.01 = 1,000 JPY. To convert: 1,000 / 157.30 = approximately $6.36 per pip (and this changes as the rate moves).
Fractional pips
Some platforms quote prices to five decimal places for most pairs and three decimal places for JPY pairs. The fifth decimal is called a fractional pip or "pipette." A move from 1.16820 to 1.16825 is half a pip (0.5 pips), not a full pip.
Bid, ask and spread
A forex quote almost always has two prices.
- Bid: the price at which the dealer is prepared to buy the base currency from you. This is the price you receive if you are selling EUR/USD (selling euros, buying dollars).
- Ask (offer): the price at which the dealer is prepared to sell the base currency to you. This is the price you pay if you are buying EUR/USD (buying euros, selling dollars).
The spread is the difference between the ask and the bid. If EUR/USD bid is 1.1680 and ask is 1.1682, the spread is 0.0002, or 2 pips.
The spread is an immediate cost. When you open a long position, you are buying at the ask (1.1682). For your trade to break even at that moment, the bid would need to reach 1.1682, meaning the pair must move up by the full spread before you are at zero. This is why a trade can show an unrealized loss the moment it opens, even when no price information has changed since the order was sent.
The CFTC warns that in the U.S. retail OTC forex market, the customer is generally trading against the dealer. The dealer controls the displayed bid and ask. A dealer's spread reflects their compensation (in part), their market exposure at that moment, and applicable competitive and regulatory factors. Spreads can widen during low-liquidity periods (off-market hours, around major news events, during volatility spikes).
All cost components
The spread is one cost, but not the only one. Total trading cost for a position can include:
- Spread: bid-ask difference, paid on entry (for a market order).
- Commission: some accounts charge a separate per-trade or per-lot commission instead of embedding the full compensation in the spread. An account with a 0.4-pip spread and a $7/100k commission may have different total cost than an account with a 2-pip spread and no commission. Compare the total, not the label.
- Markup: some platforms widen spreads beyond what the underlying liquidity would imply. This is the dealer's commercial decision and is legal within regulatory bounds.
- Slippage: the difference between the expected fill price and the actual fill price. A market order in a fast-moving market or at an illiquid time can fill several pips from where the price appeared when you clicked. Slippage can be positive (you filled better than expected) or negative (you filled worse).
- Financing (rollover or swap): a leveraged OTC position held past the dealer's daily rollover time receives or pays a financing amount reflecting the interest-rate differential between the two currencies, adjusted by dealer terms. This is discussed in the rollover section below.
Comparing two accounts
Account A: 2-pip spread, no separate commission. Entry at ask 1.1682, bid at 1.1680. One standard lot (100,000 EUR). Spread cost = 2 pips x $10/pip = $20 round-trip (both entry and exit).
Account B: 0.4-pip spread, $7 commission per 100k side ($14 round-trip). One standard lot. Spread cost = 0.4 pips x $10/pip = $4. Commission = $14. Total = $18 round-trip.
On this example, Account B is cheaper ($18 vs $20) if slippage and execution quality are equal. That comparison can reverse if Account A has better execution on fast markets. The point is not which account type is better; it is that total cost requires adding all components, not just reading the displayed spread.
Worked example: pip value to money P&L
Position: buy 25,000 EUR/USD at the ask of 1.1682. The position is closed when the bid reaches 1.1710.
Notional value at entry: 25,000 x 1.1682 = $29,205
Move: 1.1710 (exit bid) minus 1.1682 (entry ask) = 0.0028, or 28 pips.
Pip value: 25,000 x 0.0001 = $2.50 per pip (USD is the quote currency).
Gross profit after spread: 28 pips x $2.50 = $70, because entering at the ask and exiting at the bid already includes the 2-pip spread.
Costs:
- Spread: $5.00 (2 pips x $2.50), already reflected in the 28-pip move above and not deducted again
- Commission round-trip: $5.00 (hypothetical, $2.50 each side at 25k notional)
- Slippage: $1.50 (hypothetical, modest adverse slippage at entry)
- Rollover (one overnight): $7.00 (hypothetical debit)
Total further costs: $5.00 + $1.50 + $7.00 = $13.50.
Net P&L: $70.00 minus $13.50 of further costs = $56.50 net.
The trade was correct directionally by 28 pips. Net gain was about 22.6 pips equivalent ($56.50 / $2.50). Commission, slippage and rollover consumed about 19% of the 28-pip move, after the 2-pip spread had already reduced it. This is not unusual for small positions in pairs with 2-pip spreads held overnight. The calculation changes significantly with wider or narrower spreads, different position sizes, more or fewer nights held, and commissions.
Cross rates
Most currency pairs are quoted against the U.S. dollar. When a pair does not include the U.S. dollar directly, it is called a cross rate. Examples include EUR/JPY, GBP/CHF and AUD/NZD.
A cross rate can be derived mathematically from two USD pairs. For EUR/JPY:
EUR/JPY = EUR/USD x USD/JPY
Hypothetical example: EUR/USD = 1.1600, USD/JPY = 160.00
EUR/JPY = 1.1600 x 160.00 = 185.60
This arithmetic is called triangular consistency. In practice, EUR/JPY trades directly on most platforms and may show a price marginally different from the pure arithmetic result, reflecting the separate supply and demand in each direct market and dealer margins on the cross.
Triangular consistency as a reasoning tool
If you see EUR/USD, USD/JPY and EUR/JPY quoted simultaneously, you can check whether the cross is consistent with the two USD pairs. A large inconsistency would mean arbitrage profit was available, which professional markets eliminate quickly. A small inconsistency is normal. Using triangular consistency is useful for sanity-checking your own arithmetic, not for chasing tiny real-time discrepancies on a retail platform.
Pips versus percentage versus money P&L
Each way of expressing a move answers a different question.
- Pips tell you the market's movement in the pair's conventional unit. They say nothing about position size or account impact.
- Percentage normalizes the move by the price, so a 100-pip move in a 1.16 pair and a 100-pip move in a 0.64 pair represent different percentage changes. EUR/USD moving 100 pips from 1.1600 is 0.86%; AUD/USD moving 100 pips from 0.6400 is 1.56%.
- Money P&L reflects the actual dollar gain or loss given your position size. This is the number that matters for risk management.
All three are useful. Pips help you compare moves across time in the same pair. Percentage helps you compare different pairs or see the move in context. Money P&L is what your account reflects. Use all three together rather than picking one by habit.
Rollover and carry
A leveraged OTC forex position involves borrowing one currency to buy another. An interest-rate differential exists between any two currencies. The rollover (also called the swap or tom-next) is an adjustment reflecting the cost or benefit of holding a position past the dealer's daily rollover time, typically around 5:00 PM New York time.
If you are long EUR/USD, you are effectively long euros and short U.S. dollars. If the euro-area interest rate is lower than the U.S. rate at the relevant short-term benchmark, you are borrowing the higher-yielding currency (USD) to hold the lower-yielding one (EUR). You would normally pay a net rollover debit in this scenario. If the euro rate were higher than the U.S. rate, you would receive a rollover credit.
How rollover is set in retail OTC
The theoretical basis for rollover rates is the forward-market relationship between spot rates and short-term interest rates (the interest-rate parity mechanism). In practice, U.S. retail OTC dealers set their own rollover terms, which include their own adjustment on top of the theoretical differential. The CFTC advisory notes that the customer is generally trading against the dealer rather than on an open exchange, so the dealer controls the prices it offers, and retail rollover terms are set by the dealer. For positions held short-term, rollover may be a minor cost. For positions held for many days or weeks, it can accumulate meaningfully.
Rollover is not a prediction
A high positive carry (holding a high-yielding currency against a low-yielding one) does not mean the trade is profitable. The currency pair's price moves reflect many factors beyond interest rates, including expectations, risk appetite and positioning. A large carry position can reverse violently. Carry is an accounting of interest-rate differential, not a forecast of price direction.
Forwards and forward points
In the institutional FX market, the cost of carrying a position is embedded in forward prices as forward points. A one-month EUR/USD forward at different prices from the spot price reflects the expected interest-rate differential over that month. The retail rollover mechanism is a separate implementation of the same underlying concept adapted for the continuously-held retail spot position model.
The Federal Reserve H.10 and exchange rates
For U.S. readers who need a primary public reference for exchange-rate data, the Federal Reserve Board publishes the H.10 release of foreign exchange rates. The H.10 provides bilateral exchange rates and dollar indexes. Pay attention to the table's quote convention (some currencies are quoted as units per dollar, others as dollars per currency unit) before using any number in a calculation. The H.10 is a data reference source, not an executable trading price.
The Quote to Cost to Carry workflow
Swoopr's recommended workflow for evaluating a forex trade before entering it covers three phases in order.
- Quote: Identify the pair, confirm the base and quote currency, read the bid and ask, calculate pip value for your intended position size, confirm the current spread in pips and in dollar terms.
- Cost: Add up all expected costs: entry spread, exit spread (estimate), any commission both ways, expected slippage (especially around news events or at low-liquidity hours), and check whether there are any other platform fees.
- Carry: Determine whether you are holding the position overnight. If so, check the rollover rate on your platform. Multiply the per-night cost or credit by the number of nights you expect to hold. Add that to total cost (or subtract if you receive a net credit).
Only after running these three steps do you know the actual economics of the trade. Skipping cost and carry means your risk-reward analysis is incomplete.
Common mistakes
- Thinking a 2-pip spread is the only cost: Commission, slippage and rollover can each exceed the spread on a small trade.
- Using pip count as the risk measure: A 20-pip stop is meaningless without knowing the position size and pip value.
- Comparing spreads without comparing execution: A tighter spread on paper can mean nothing if slippage is worse.
- Ignoring the rollover sign: The rollover can go either way. Check before assuming you receive credit for a carry trade.
- Using percentage moves across very different pairs without adjusting for pip value: Pip value differs by pair. A 50-pip move in EUR/USD is not the same dollar amount as a 50-pip move in GBP/USD.
- Forgetting that JPY pairs have different pip conventions: USD/JPY's pip is 0.01, not 0.0001. Applying the wrong convention inflates or deflates pip value by a factor of 100.
- Treating rollover as "just carry": Retail rollover rates are set by the dealer. They are not the same as central-bank policy rates or institutional forward points, and they can change.
Misconceptions versus reality
| Misconception | Reality |
|---|---|
| The tightest spread is always the cheapest | Commission, slippage and execution quality all factor into total cost |
| A pip is the same dollar amount in every pair | Pip value depends on pair, position size, and current exchange rate |
| Carry trades are guaranteed to profit from the rate differential | Currency price moves can easily outweigh the rollover credit |
| EUR/JPY is priced independently of EUR/USD and USD/JPY | Cross rates derive from the USD legs; triangular consistency applies |
| Retail rollover rates equal the central bank interest-rate differential | Dealers apply their own terms on top of the theoretical differential |
| Spread is only paid at entry | A round trip costs the quoted spread once in total, because you buy at the ask and sell at the bid |
Practical checklist: Quote to Cost to Carry
Quote phase
- Name the pair and confirm which is base and which is quote.
- Read the current bid and ask.
- Calculate pip size (0.0001 or 0.01 for JPY pairs).
- Calculate pip value for your intended lot size.
- Note the spread in pips.
Cost phase
- Calculate spread cost at entry in dollar terms.
- Calculate spread cost at exit in dollar terms.
- Add commission (if applicable, both ways).
- Estimate slippage for current market conditions.
- Add any other platform fees.
Carry phase
- Check whether the position will be held past rollover time.
- Check rollover rate on your platform (debit or credit).
- Multiply by expected holding nights.
- Add to or subtract from total cost.
Review
- Compare total cost to the gross move required for the trade to be profitable.
- Confirm total cost is consistent with risk plan before entry.
Frequently asked questions
What is a pip in forex?
A pip is the conventional smallest price move in a currency pair. For most pairs it is 0.0001 (the fourth decimal place). For JPY pairs it is 0.01 (the second decimal place). Pip value in dollars depends on position size and the current exchange rate.
What is the bid-ask spread in forex?
The bid is the price the dealer buys the base currency from you; the ask is the price it sells to you. The spread is the difference. It is an immediate cost of trading: you enter a long position at the ask and would need the bid to reach your entry ask to break even at that moment.
How do cross rates work?
A cross rate is a currency pair that does not include the U.S. dollar. It can be derived arithmetically from two USD pairs (e.g., EUR/JPY = EUR/USD x USD/JPY). Cross rates trade directly on most platforms, but their price is constrained by triangular consistency with the two USD legs.
What is forex rollover?
Rollover is the daily financing adjustment on a leveraged position held past the dealer's rollover time (usually around 5 PM New York time). It reflects the interest-rate differential between the two currencies, adjusted by dealer terms. It can be a debit or a credit depending on the pair and direction of your position.
How is pip value calculated?
For pairs where USD is the quote currency (such as EUR/USD), pip value = position size in base currency x pip size. For 100,000 EUR, pip value = 100,000 x 0.0001 = $10 per pip. For pairs where USD is the base currency (such as USD/JPY), pip value is in JPY and must be converted by dividing by the current exchange rate.
Is a narrow spread always better?
Not necessarily. Total cost includes commission, slippage and rollover in addition to the spread. An account with a narrow spread but a separate commission can cost more than one with a wider spread and no commission, depending on position size and trade frequency.
Related guides in this cluster
- Forex Trading & Currency Markets: how the FX market works, who participates, what moves currency pairs, and the full research workflow.
- Forex Risk Management, Leverage & Margin: the Exposure Stack framework, NFA margin rules, position sizing from planned loss, slippage and gap risk, portfolio correlation, and a complete worked example.
References
- Federal Reserve Board: Foreign Exchange Rates: H.10
- Commodity Futures Trading Commission: Eight Things You Should Know Before Trading Forex
- National Futures Association: Forex Transactions: Regulatory Guide
- Bank for International Settlements: OTC foreign exchange turnover in April 2025
- Global Foreign Exchange Committee: FX Global Code