Convert to Quantity

The Convert to Quantity rule converts a decimal number into a properly formatted quantity (lot size) value for a specific financial instrument. This ensures that your calculated position sizes conform to the instrument's minimum lot size, lot step, and maximum lot constraints before being sent to the broker.

How It Works

Every financial instrument has specific lot size requirements defined by the broker, including a minimum quantity, a maximum quantity, and a step increment. The Convert to Quantity rule takes a raw decimal number representing a desired position size and formats it into a valid quantity that meets these requirements. The value is adjusted to the nearest valid step and clamped within the allowed range.

This is a critical step in any position sizing pipeline. If you calculate lot size using a Simple Calculator or other arithmetic rules, the result may not align with the broker's requirements. For example, you might calculate 1.237 lots, but the instrument only allows increments of 0.01 lots. Convert to Quantity handles this adjustment automatically, rounding down to avoid exceeding your intended risk.

Inputs

Input	Type	Required	Description
Decimal Number (Qty)	Number	Yes	The raw decimal number representing the desired position size or lot count to convert.
Symbol	Symbol	Yes	The financial instrument whose lot size requirements are used for the conversion (e.g., EURUSD, AAPL, BTCUSD).

Outputs

Output	Type	Description
Quantity	Quantity	The formatted quantity value that conforms to the instrument's lot size requirements (minimum, maximum, and step increment).

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