---
title: "literUnit(with:)"
framework: healthkit
role: symbol
role_heading: Type Method
path: "healthkit/hkunit/literunit(with:)"
---

# literUnit(with:)

Returns a HealthKit unit for measuring volume, using liter units with the provided prefix.

## Declaration

```swift
class func literUnit(with prefix: HKMetricPrefix) -> Self
```

## Parameters

- `prefix`: A valid metric prefix value. For the complete list of prefix values, see doc://com.apple.healthkit/documentation/HealthKit/HKMetricPrefix.

## Return Value

Return Value A HealthKit unit for measuring volume based on liters and the provided prefix.

## Discussion

Discussion This method is used to create prefixed versions of liters, typically milliliter units, as shown below.

## See Also

### Constructing volume units

- [liter()](healthkit/hkunit/liter().md)
- [fluidOunceUS()](healthkit/hkunit/fluidounceus().md)
- [fluidOunceImperial()](healthkit/hkunit/fluidounceimperial().md)
- [cupUS()](healthkit/hkunit/cupus().md)
- [cupImperial()](healthkit/hkunit/cupimperial().md)
- [pintUS()](healthkit/hkunit/pintus().md)
- [pintImperial()](healthkit/hkunit/pintimperial().md)