What is mini lot, and what does “worked example” mean?
A mini lot is a smaller trade size in forex than a standard lot. In many forex conventions, trade sizes are expressed in lots where 1.00 standard lot is typically 100,000 units of the base currency. A mini lot is typically 0.10 of a standard lot, which corresponds to 10,000 units of the base currency.
A worked example is a numeric scenario where you explicitly choose inputs (such as lot size and pip size assumptions), then compute the output step by step so the reader can reproduce the math. Because real trading involves variable conditions, a worked example also includes assumptions and notes what is not determined by the example.
How does a mini lot worked example work?
To make the example checkable, separate stable mechanics from variable conditions:
- Stable mechanics (assumed for the example): lot size maps to units of the base currency; pip size is defined by the quote format.
- Variable conditions (not fixed by the example): the actual spread you pay, execution price, slippage, fees/commissions, and whether your broker’s reporting rounds in a specific way.
Key assumptions for the example
Use one worked example that you can verify with basic arithmetic.
Assumption A1 (lot size): mini lot = 0.10 standard lot = 10,000 units of the base currency.
Assumption A2 (quote format): use a currency pair quoted with 4–decimal pip logic, where 1 pip = 0.0001 of the quoted price.
Assumption A3 (pip value simplification): to avoid broker- or account-specific conversion, assume the pip value you compute is expressed in quote currency in a way consistent with the pair having the quote currency as the currency you want to measure in. (If you use a different currency for your account, conversions can change the final number.)
Worked example inputs
- Trade size: 1.00 mini lot = 10,000 units of base currency
- Move in price: +50 pips
- Pip size: 1 pip = 0.0001
Evidence or example: numeric mini lot pip impact
Compute the value of a price move using the pip size and position units.
Step 1: Convert pips to a price change
- Price change = 50 pips × 0.0001
- Price change = 0.0050 (in quoted price terms)
Step 2: Relate the price change to position size
For many 4-decimal FX quotes, a standard approach is:
- P/L in quote currency ≈ units × price change
Here:
- units (base currency) = 10,000
- price change = 0.0050
So:
- P/L ≈ 10,000 × 0.0050 = 50
Result (under the stated assumptions): a +50 pip move corresponds to an approximate +50 units of the quote currency for a 1.00 mini lot position, before spread, commissions, and execution effects.
What you can verify independently
A reader can check each assumption:
- Confirm the relationship between mini lot and standard lot units used by their provider.
- Confirm pip size for the specific quoting format they see (not every instrument uses the same pip definition).
- Recompute the arithmetic with the same inputs to confirm the magnitude.
Limitations and risks: what the worked example does not guarantee
Even with correct math, several material limitations can change real results:
- Spread and costs: The example ignores the spread paid at entry/exit. If you trade with a buy/sell spread, the realized outcome can differ even if price moves in your favor after entry.
- Execution and slippage: In fast markets, the executed price may differ from the intended price, changing the effective pip count.
- Pip value depends on conversion: If your account currency differs from the quote currency, pip value may require currency conversion, and the conversion rate used can vary.
- Rounding and broker conventions: Brokers may round lot sizes, pip calculations, or reporting in ways that affect small numeric details.
A failure mode to watch for is mixing conventions: for example, using a pip size assumption that does not match the instrument’s quote format, or using the wrong unit conversion between mini lot and base currency units. In that case, the numeric result can be off by a factor even if the arithmetic steps look consistent.