---
title: "sumQuantity(for:)"
framework: healthkit
role: symbol
role_heading: Instance Method
path: "healthkit/hkstatistics/sumquantity(for:)"
---

# sumQuantity(for:)

Returns the sum of all the samples that match the query and that were created by the specified source.

## Declaration

```swift
func sumQuantity(for source: HKSource) -> HKQuantity?
```

## Parameters

- `source`: A data source from the statistics object’s doc://com.apple.healthkit/documentation/HealthKit/HKStatistics/sources array.

## Return Value

Return Value If both the cumulativeSum option and the separateBySource option were set, this method returns a quantity object. This object contains the sum of all the samples that match the query and were created by the specified source. If the statistics options were not both set, this method returns nil.

## See Also

### Related Documentation

- [endDate](healthkit/hkstatistics/enddate.md)
- [sources](healthkit/hkstatistics/sources.md)
- [startDate](healthkit/hkstatistics/startdate.md)

### Getting Statistics Data

- [averageQuantity()](healthkit/hkstatistics/averagequantity().md)
- [averageQuantity(for:)](healthkit/hkstatistics/averagequantity(for:).md)
- [maximumQuantity()](healthkit/hkstatistics/maximumquantity().md)
- [maximumQuantity(for:)](healthkit/hkstatistics/maximumquantity(for:).md)
- [minimumQuantity()](healthkit/hkstatistics/minimumquantity().md)
- [minimumQuantity(for:)](healthkit/hkstatistics/minimumquantity(for:).md)
- [sumQuantity()](healthkit/hkstatistics/sumquantity().md)
- [duration()](healthkit/hkstatistics/duration().md)
- [duration(for:)](healthkit/hkstatistics/duration(for:).md)