---
title: unit
framework: storekit
role: symbol
role_heading: Instance Property
path: storekit/skproductsubscriptionperiod/unit
---

# unit

The increment of time that a subscription period is specified in.

## Declaration

```swift
var unit: SKProduct.PeriodUnit { get }
```

## Discussion

Discussion The units used to specify a subscription period include day, week, month, and year, as defined in SKProduct.PeriodUnit. To calculate the duration of one subscription period, multiply the unit by the number of units (numberOfUnits).

## See Also

### Getting Subscription Period Details

- [numberOfUnits](storekit/skproductsubscriptionperiod/numberofunits.md)
- [SKProduct.PeriodUnit](storekit/skproduct/periodunit.md)