---
title: isSubnormal
framework: swift
role: symbol
role_heading: Instance Property
path: swift/floatingpoint/issubnormal
---

# isSubnormal

A Boolean value indicating whether the instance is subnormal.

## Declaration

```swift
var isSubnormal: Bool { get }
```

## Discussion

Discussion A subnormal value is a nonzero number that has a lesser magnitude than the smallest normal number. Subnormal values don’t use the full precision available to values of a type. Zero is neither a normal nor a subnormal number. Subnormal numbers are often called denormal or denormalized—these are different names for the same concept.