# rounded(rule:increment:) Modifies the format style to use the specified rounding rule and increment. ``` func rounded(rule: Decimal.FormatStyle.Configuration.RoundingRule = .toNearestOrEven, increment: Int? = nil) -> Decimal.FormatStyle ``` ## 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 decimal format style modified to use the specified rounding rule and increment. ## Discussion The following example creates a default [`Decimal.FormatStyle`](/documentation/Foundation/Decimal/FormatStyle) for the `en_US` locale, and a modified style that rounds integers to the nearest multiple of `100`. It then formats the value `1999.95` using these format styles. ```swift let defaultStyle = Decimal.FormatStyle(locale: Locale(identifier: "en_US")) let roundedStyle = defaultStyle.rounded(rule: .toNearestOrEven, increment: 100) let num: Decimal = 1999.95 let defaultNum = num.formatted(defaultStyle) // "1,999.95" let roundedNum = num.formatted(roundedStyle) // "2,000" ``` --- 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)