---
title: "lengthOfBytes(using:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/stringprotocol/lengthofbytes(using:)"
---

# lengthOfBytes(using:)

Returns the number of bytes required to store the String in a given encoding.

## Declaration

```swift
func lengthOfBytes(using encoding: String.Encoding) -> Int
```