# scale(_:) Modifies the format style to use the specified scale. ``` func scale(_ multiplicand: Double) -> IntegerFormatStyle ``` ## Parameters `multiplicand` The multiplicand to apply to the format style. ## Return Value An integer format style modified to use the specified scale. ## Discussion The following example creates a default [`IntegerFormatStyle`](/documentation/Foundation/IntegerFormatStyle) for the `en_US` locale, and a second style that scales by a multiplicand of `0.001`. It then applies each style to an array of integers. The formatting that the modified style applies expresses each value in terms of one-thousandths. ```swift let defaultStyle = IntegerFormatStyle(locale: Locale(identifier: "en_US")) let scaledStyle = defaultStyle.scale(0.001) let nums = [100, 1000, 10000, 100000, 1000000] let defaultNums = nums.map { defaultStyle.format($0) } // ["100", "1,000", "10,000", "100,000", "1,000,000"] let scaledNums = nums.map { scaledStyle.format($0) } // ["0.1", "1", "10", "100", "1,000"] ``` --- 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)