Direct answer
Bid price is the quote price at which a market participant (for example, a liquidity provider) is willing to buy the base currency. In a typical two-way forex quote, bid is the price for selling the base currency, and ask is the price for buying it. A worked example helps you see how the bid number affects the cash amount you would receive (or effectively pay) under specific assumptions.
Mechanism or definition
Two-way quotes
Forex quotes are commonly displayed as a pair: bid/ask.
- Bid price: what you would receive if you sell at that moment.
- Ask price: what you would pay if you buy at that moment.
Worked-example inputs you must specify
To calculate anything from bid price, you must choose (and state) assumptions such as:
- the quote format (which currency is the base and which is the quote),
- the contract size (units of the base currency),
- the exact bid value you are using (the displayed quote at a chosen time),
- and whether you include any fees or commission (if known).
Because real trading involves changing prices, slippage, and variable execution, any numeric example is only valid for the stated assumptions.
Evidence or example
Example scenario (assumptions stated)
Assume a forex quote where the base currency is EUR and the quote currency is USD, shown as:
- Bid = 1.1000
- Ask = 1.1002
Assume you transact 1 lot = 100,000 EUR. Assume the bid you use is exactly 1.1000 and execution occurs at that bid with no extra costs.
Now consider the cash effect of a sell at the bid (selling EUR to receive USD):
- Units sold (base currency): 100,000 EUR.
- Conversion using bid: USD received = 100,000 × 1.1000.
- Result: USD received = 110,000 USD.
Same quote, different direction (comparison within the same example)
If instead you were to buy EUR, the relevant price would be the ask (1.1002). Under the same 100,000 EUR size:
- USD paid = 100,000 × 1.1002 = 110,020 USD (again assuming execution matches the displayed ask and no extra costs).
This comparison shows how bid and ask create a difference in the cash amounts based on direction, even when the underlying “mid” level is conceptually similar.
Material limitation inside the example
If execution does not match the displayed bid (for instance, due to a wider spread at the time of trading or a brief price move), the actual USD received can differ from the calculation above. Therefore, the example demonstrates mechanics, not a guaranteed realized amount.
Limitations and risks
- Displayed quotes can change: bid price is time-dependent. A calculation is only correct for the specific bid used.
- Spread and costs affect realized results: the bid/ask difference and any commissions or fees reduce or increase realized cash flows versus simplified numbers.
- Execution uncertainty (slippage): even if bid is displayed, the executed price may differ.
- Bid price does not predict future prices: bid price describes willingness to buy at a moment; it is not, by itself, a forward-looking signal.
Verification or next question
To independently verify your understanding, repeat the arithmetic with your own stated assumptions:
- pick a bid value,
- pick the base/quote currency direction,
- pick a contract size,
- then compute the cash received for a sell at bid.
A next question to clarify is: Which quote convention applies to your platform or documentation (how it defines base and quote currencies for the pair you are using)?