---
title: maximumSignificantDigits
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/numberformatter/maximumsignificantdigits
---

# maximumSignificantDigits

The maximum number of significant digits for the number formatter.

## Declaration

```swift
var maximumSignificantDigits: Int { get set }
```

## Discussion

Discussion You must set the usesSignificantDigits property to true in order for this property to affect formatting behavior.  By default, the maximum number of significant digits is 6. Values less than 1 are ignored. The following code demonstrates the effect of setting maximumSignificantDigits when formatting various numbers: var numberFormatter = NumberFormatter() numberFormatter.usesSignificantDigits = true numberFormatter.maximumSignificantDigits = 4

numberFormatter.string(from: 12345) // 12340 numberFormatter.string(from: 123.456) // 123.5 numberFormatter.string(from: 100.234) // 100.2 numberFormatter.string(from: 1.230) // 1.23 numberFormatter.string(from: 0.00012345) // 0.0001234

## See Also

### Configuring Significant Digits

- [usesSignificantDigits](foundation/numberformatter/usessignificantdigits.md)
- [minimumSignificantDigits](foundation/numberformatter/minimumsignificantdigits.md)