---
title: usesSignificantDigits
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/numberformatter/usessignificantdigits
---

# usesSignificantDigits

A Boolean value indicating whether the formatter uses minimum and maximum significant digits when formatting numbers.

## Declaration

```swift
var usesSignificantDigits: Bool { get set }
```

## Discussion

Discussion The NumberFormatter class has two ways of determining how many digits to represent:_ _using integer and fraction digits and using significant digits. When this property is set to false, numbers are formatted according to whether you want them formatted as fractions or as integers. For more information, see Configuring Integer and Fraction Digits. This property is false by default. Set this property to true to format numbers according to the significant digits configuration specified by the minimumSignificantDigits and maximumSignificantDigits properties. By default, the minimum number of significant digits is 1, and the maximum number of significant digits is 6. note: When a number formatter is configured to use significant digits, it ignores any minimum or maximum values used to set integer or fraction digits. The following code demonstrates the effect of configuring usesSignificantDigits when formatting various numbers: var numberFormatter = NumberFormatter()

// Using significant digits numberFormatter.usesSignificantDigits = true numberFormatter.string(from: 12345678) // 12345700 numberFormatter.string(from: 1234.5678) // 1234.57 numberFormatter.string(from: 100.2345678) // 100.235 numberFormatter.string(from: 1.230000) // 1.23 numberFormatter.string(from: 0.00000123) // 0.00000123

// Using integer and fraction digits numberFormatter.usesSignificantDigits = false numberFormatter.string(from: 12345678) // 12345678 numberFormatter.string(from: 1234.5678) // 1235 numberFormatter.string(from: 100.2345678) // 100 numberFormatter.string(from: 1.230000) // 1 numberFormatter.string(from: 0.00000123) // 0

## See Also

### Configuring Significant Digits

- [minimumSignificantDigits](foundation/numberformatter/minimumsignificantdigits.md)
- [maximumSignificantDigits](foundation/numberformatter/maximumsignificantdigits.md)