What “changing lot size” means in forex
In forex, lot size is the volume of currency you trade. When you change lot size, you change how much of the market movement you are exposed to. This matters because the value of a price move (often discussed as pip value) scales with position size.
A pip is a standard unit of price change used in many forex quotes. Exactly how pip value is computed depends on the instrument’s contract specifications and the currency conversion needed to express the pip value in your account currency.
How to change lot size in an order ticket
Changing lot size typically happens at the time you place an order, by selecting a different trade volume.
- Decide what you mean by “lot size” in your platform
- Some platforms label volumes in lots (for example, standard, mini, or micro), while others let you type an exact volume figure.
- “Changing lot size” generally means changing the “volume” field on the order ticket.
- Use the order entry screen
- Open the order ticket (the screen where you set symbol, type, and execution).
- Locate the volume/lot size control.
- Enter the new lot size (or choose the preset) before submitting the order.
- Understand when changes are allowed
- Volume is usually locked once an order is submitted.
- If you need a different lot size after submission, many platforms require cancelling the order and placing a new one. The exact workflow depends on the platform and order type.
Checks and comparisons: pip value and exposure
Because pip value scales with lot size, you can use a simple comparison mindset:
- If you double lot size, you generally expect the pip value for that trade to also roughly double, assuming the same instrument and conditions.
- If you change the account currency or the quote/base currency relationship for the pair, the platform’s pip value display may change in a non-obvious way.
Practical checks that do not require predictions:
- Look at the platform’s displayed pip value (or contract details) after you change the volume.
- Confirm the instrument (currency pair) is the same, because pip size conventions and contract specs can differ across instruments.
If the platform shows calculations, verify they are updating immediately when you adjust the volume field; that is evidence you are changing the intended exposure.
Limitations and what to verify before relying on calculations
Lot size changes affect exposure and pip value, but they do not guarantee any outcome. You should verify the following because they can differ by broker, platform, and instrument:
- Order rules: whether you can modify an existing order or must cancel and recreate it.
- Contract specifications: pip definition and contract size may vary.
- Account and conversion: how the platform converts pip value into your account currency.
Also note: this explanation covers the general mechanics of changing volume on an order ticket. Platforms may use different labels for the same concept, so the most reliable confirmation is the volume/lot size field and the pip value (or position details) that updates after your change.