# rounded(rule:increment:) Modifies the format style to use the specified rounding rule and increment. ``` func rounded(rule: FloatingPointFormatStyle.Configuration.RoundingRule = .toNearestOrEven, increment: Double? = nil) -> FloatingPointFormatStyle ``` ## Parameters `rule` The rounding rule to apply to the format style. `increment` A multiple by which the formatter rounds the fractional part. The formatter produces a value that is an even multiple of this increment. If this parameter is `nil` (the default), the formatter doesn’t apply an increment. ## Return Value A floating-point format style modified to use the specified rounding rule and increment. ## Discussion The following example creates a default [`FloatingPointFormatStyle`](/documentation/Foundation/FloatingPointFormatStyle) for the `en_US` locale, and modifies its rounding behavior. It uses the rounding rule, and an increment of `0.25`. It then applies this style to an array of floating-point values, rounding them to the next greater increment of 0.25. ```swift let roundedStyle = FloatingPointFormatStyle(locale: Locale(identifier: "en_US")) .rounded(rule: .up, increment: 0.25) let nums = [1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6] let roundedNums = nums.map { roundedStyle.format($0) } // ["1.00", "1.25", "1.25", "1.50", "1.50", "1.50", "1.75"] ``` --- 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)