---
title: formSquareRoot()
framework: swift
role: symbol
role_heading: Instance Method
path: swift/double/formsquareroot()
---

# formSquareRoot()

Replaces this value with its square root, rounded to a representable value.

## Declaration

```swift
mutating func formSquareRoot()
```

## See Also

### Performing Calculations

- [Floating-Point Operators for Double](swift/floating-point-operators-for-double.md)
- [addingProduct(_:_:)](swift/double/addingproduct(_:_:).md)
- [addProduct(_:_:)](swift/double/addproduct(_:_:).md)
- [squareRoot()](swift/double/squareroot().md)
- [remainder(dividingBy:)](swift/double/remainder(dividingby:).md)
- [formRemainder(dividingBy:)](swift/double/formremainder(dividingby:).md)
- [truncatingRemainder(dividingBy:)](swift/double/truncatingremainder(dividingby:).md)
- [formTruncatingRemainder(dividingBy:)](swift/double/formtruncatingremainder(dividingby:).md)
- [negate()](swift/double/negate().md)