Direct answer: what pip value means for Sterling crosses
Pip value is the monetary change in your account currency caused by a one-pip move in a specific forex price. For Sterling crosses (pairs involving GBP that are not GBP/USD), the pip value is not just a simple multiplication by a pip fraction: you also need to convert the pip’s value into your account currency.
To explain it accurately, you separate three parts:
- the size of one pip for that pair,
- how your trade size turns that pip into a base-currency amount,
- how you convert that amount into your account currency using exchange rates.
Mechanism or definition: a simple model you can check
Step 1 — define pip size (the smallest price increment)
A “pip” is defined by how the pair is quoted.
- Many major FX pairs quoted to four decimals use a pip size of 0.0001.
- Pairs quoted to two decimals often use 0.01.
For Sterling crosses, the pip size depends on the provider’s quoting convention for that exact pair. You must use the pip size that matches the instrument you are trading.
Step 2 — compute the pip move in the pair’s quoted structure
Consider a generic cross quoted as:
- A/B (A is base currency, B is quote currency)
- Price = P (B per 1 A)
A one-pip move changes the price by ΔP, where ΔP is the pip size (e.g., 0.0001 or 0.01). For a small move, the implied value change can be represented using the base-currency exposure.
Let:
- Position size = N units of the base currency A (for example, N = 10,000 for 0.1 lot under a standard lot definition)
- Pip move in price = ΔP
Then the notional change in quote currency B is proportional to:
- ΔV(B) = N × ΔP
This “notional” relationship is the core mechanic. In practice, platform calculators may also normalize by how they define one pip per lot size, but the logic is the same: pip value scales with both pip size and exposure.
Step 3 — convert the pip value into the account currency
Your account currency may be different from both A and B. Suppose your account currency is C. You need to express the pip’s monetary effect in C.
You convert using the appropriate exchange rate(s):
- If C = B, then pip value in account currency is already ΔV(C) = ΔV(B).
- If C = A, you need to convert from B to A. Using the definition P = B per 1 A, you can express conversion factors accordingly.
- If C is neither A nor B, you usually need a second conversion leg through an intermediate rate (a common approach is converting B → USD or B → another liquid currency, then into C). The exact route depends on what direct rates your calculator can use.
A common failure mode in Sterling crosses is assuming you can convert directly without checking whether the needed rate is quoted in the correct direction.
Evidence or example: walk through a Sterling cross calculation (with assumptions)
Assume you trade a Sterling cross quoted as GBP/EUR (meaning A = GBP, B = EUR). Let:
- Pip size for this instrument is ΔP = 0.0001 (use the instrument’s quoting convention)
- Position size = N = 10,000 GBP (choose a base exposure consistent with your own lot definition)
- Account currency = USD (C = USD)
- Pip move produces an implied quote-currency change in EUR:
- ΔV(EUR) = N × ΔP = 10,000 × 0.0001 = 1.0 EUR
- Convert 1.0 EUR into USD using the relevant EUR/USD rate at the time you calculate:
- If the rate is quoted as EUR/USD = r, then 1 EUR = r USD.
- So ΔV(USD) = 1.0 × r.
Key assumptions you must state when you verify this:
- You used the correct pip size for GBP/EUR as quoted by the same provider/instrument.
- You used consistent lot/exposure units (N in the base currency).
- You used the correct FX rate direction for EUR → USD.
If your account currency were EUR instead, you would stop after step 1 because the pip value would already be expressed in the quote currency.