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# HKQuantityType

A type that identifies samples that store numerical values.

```
class HKQuantityType
```

## Overview

The [`HKQuantityType`](/documentation/HealthKit/HKQuantityType) class is a concrete subclass of the [`HKObjectType`](/documentation/HealthKit/HKObjectType) class. To create a quantity type instance, use the object type’s [`quantityType(forIdentifier:)`](/documentation/HealthKit/HKObjectType/quantityType(forIdentifier:)) convenience method.

Use quantity types to:

- Request permission to read or write matching quantity samples.
- Create and share matching quantity samples.
- Query for matching quantity samples.

## Topics

### Creating Quantity Types

[`init(_:)`](/documentation/HealthKit/HKQuantityType/init(_:))

Creates a quantity type using the provided identifier.

### Accessing Quantity Type Data

[`aggregationStyle`](/documentation/HealthKit/HKQuantityType/aggregationStyle)

The aggregation style for the given quantity type.

[`HKQuantityAggregationStyle`](/documentation/HealthKit/HKQuantityAggregationStyle)

Constant values that describe how quantities can be aggregated over time.

[`is(compatibleWith:)`](/documentation/HealthKit/HKQuantityType/is(compatibleWith:))

Returns a Boolean value that indicates whether the quantity type is compatible with the given unit.

## See Also

[`HKQuantityTypeIdentifier`](/documentation/HealthKit/HKQuantityTypeIdentifier)

The identifiers that create quantity type objects.

[`HKQuantitySample`](/documentation/HealthKit/HKQuantitySample)

A sample that represents a quantity, including the value and the units.


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