---
title: isSubnormal
framework: swift
role: symbol
role_heading: Instance Property
path: swift/float/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.

## See Also

### Querying a Float’s State

- [isZero](swift/float/iszero.md)
- [isFinite](swift/float/isfinite.md)
- [isInfinite](swift/float/isinfinite.md)
- [isNaN](swift/float/isnan.md)
- [isSignalingNaN](swift/float/issignalingnan.md)
- [isNormal](swift/float/isnormal.md)
- [isCanonical](swift/float/iscanonical.md)
- [floatingPointClass](swift/float/floatingpointclass.md)