FixedQuantity

---

class backtide.sizers.FixedQuantity(quantity)

Buy exactly N units.

Returns the configured quantity regardless of price or equity. Simple, price-naive sizing — appropriate for crypto base units or quick prototyping.

Parameters

quantity : int | float The exact number of units to trade per order.

See Also

BaseSizer

Abstract base class for all position sizers.

FixedFractional

Allocate a fixed percentage of total current equity.

FixedNotional

Buy a fixed amount of currency worth of the asset.

Methods

calculate

Calculate the order quantity for this sizer.

method backtide.sizerscalculate(equity, price, stop_distance=None, atr=None)

Calculate the order quantity for this sizer.

Parameters

equity : float Current portfolio equity in the same currency as price. When a sizer is attached to an order, the engine passes equity converted to that instrument's quote currency. price : float Reference price of the instrument. stop_distance : float | None, default=None Distance from entry to stop loss, in price units. atr : float | None, default=None Current ATR value. Required for volatility-based sizers.

Returns

int | float The number of units to trade. Positive for buys, negative for sells.