# significantDigits(_:) Returns a precision that constrains formatted values to a range of significant digits. ``` static func significantDigits(_ limits: R) -> NumberFormatStyleConfiguration.Precision where R : RangeExpression, R.Bound == Int ``` ## Parameters `limits` A range from the minimum to the maximum number of significant digits to use when formatting values. ## Return Value A precision that constrains formatted values to a range of significant digits. ## Discussion When using this precision, the formatter rounds values that have more sigificant digits than the maximum of the range, as seen in the following example: ```swift let myNum = 123456.formatted(.number .precision(.significantDigits(2...4)) .rounded(rule: .down)) // "123,400" ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)