---
title: USEC_PER_SEC
framework: dispatch
role: symbol
role_heading: Global Variable
path: dispatch/usec_per_sec
---

# USEC_PER_SEC

## Declaration

```swift
var USEC_PER_SEC: UInt64 { get }
```

## Discussion

Discussion The number of microseconds in one second.

## See Also

### Time Multiplier Constants

- [NSEC_PER_SEC](dispatch/nsec_per_sec.md)
- [NSEC_PER_MSEC](dispatch/nsec_per_msec.md)
- [NSEC_PER_USEC](dispatch/nsec_per_usec.md)