Direct answer
A worked example of a standard lot shows how a position size (the lot) converts into measurable outcomes like pip movement value and total profit or loss. Because different brokers and platforms may calculate pip value and conversion slightly differently, a “worked example” must state assumptions clearly so you can reproduce the same math with your own inputs.
Mechanism and definition
In forex, a “lot” is a standardized position size. A standard lot is commonly treated as 100,000 units of the base currency in the currency pair (the first currency in the pair notation, like EUR in EUR/USD). A pip is the smallest typical quoted price change for many pairs; for many major pairs it is 0.0001 in price terms.
Stable mechanics (typical, but not universal):
- Position size: 1 standard lot = 100,000 base-currency units.
- Pip size: for many pairs, 1 pip = 0.0001 in the quoted price.
- Pip value: depends on the pair and the conversion from the quoted pip impact into your account currency.
Important distinction: the lot size defines exposure, but the monetary value of price movement also depends on the pair, the exchange rate between currencies, and platform rules.
Evidence or example (worked numerical scenario)
Assume an account currency of USD and a trade on EUR/USD, with the following assumptions:
- Pair: EUR/USD.
- Standard lot size: 1 standard lot = 100,000 EUR.
- Pip size rule: 1 pip = 0.0001 in EUR/USD.
- Starting exchange rate for conversion: 1.1000 USD per 1 EUR (used only to convert pip impact to USD).
- You track a move of 10 pips.
Step 1: Convert pip movement to a quote-currency amount
- EUR/USD price changes by: 10 pips = 10 × 0.0001 = 0.0010.
- With 100,000 EUR, the notional value change in USD is approximately:
- 100,000 EUR × 0.0010 (USD per EUR) = 100 USD.
Step 2: Interpret direction and sign
- If EUR/USD rises by 10 pips, that typically means the position gains (for a long EUR/USD) by about +100 USD under these assumptions.
- If EUR/USD falls by 10 pips, the same magnitude is approximately a loss.
Step 3: State what is excluded from this simple math This example ignores transaction costs and execution details:
- spreads (the difference between buy and sell prices at entry/exit)
- commissions or platform fees
- slippage (execution different from the quoted price)
- any “pip” definition differences across platforms
That is why the example shows an approximate relationship between pip movement and USD impact, not a guaranteed result.
If you want to verify independently, redo the same steps with your own assumptions (pair, lot size, pip definition, and the conversion rate you use for pip value).
Limitations and risks (what can go wrong)
- Different pip and contract conventions: Not all instruments use the same pip size or how pips are interpreted by a platform.
- Conversion timing: Pip value in account currency can depend on which rate is used for conversion (starting rate, current rate, or a provider-specific method).
- Costs and execution uncertainty: Even if pip value math is correct, real outcomes differ once you include spreads, commissions, fees, and slippage.
- Historical relationships don’t ensure future results: A worked example is a calculation framework; it does not predict future price behavior.
A material failure mode is assuming the “10 pips = fixed X currency units” relationship without checking how your platform defines pips, calculates pip value, and applies conversions.
Verification or next question
To verify a worked example, you can independently check these items before using the math for any analysis:
- Your platform’s definition of pip size for the exact instrument.
- Your platform’s definition of lot size (especially for non-standard contract specifications).
- How the platform converts pip movement to your account currency.
A useful next question is: “How does my platform compute pip value and P/L for a standard lot on my exact pair?”