# *(_:_:) Multiplies two values and produces their product. ``` static func * (lhs: UInt8, rhs: UInt8) -> UInt8 ``` ## Parameters `lhs` The first value to multiply. `rhs` The second value to multiply. ## Discussion The multiplication operator (`*`) calculates the product of its two arguments. For example: ``` 2 * 3 // 6 100 * 21 // 2100 -10 * 15 // -150 3.5 * 2.25 // 7.875 ``` You cannot use `*` with arguments of different types. To multiply values of different types, convert one of the values to the other value’s type. ``` let x: Int8 = 21 let y: Int = 1000000 Int(x) * y // 21000000 ``` The product of the two arguments must be representable in the arguments’ type. In the following example, the result of `21 * 21` is greater than the maximum representable `Int8` value: ``` x * 21 // Overflow error ``` > Note: Overflow checking is not performed in `-Ounchecked` builds. If you want to opt out of overflow checking and wrap the result in case of any overflow, use the overflow multiplication operator (`&*`). ``` x &* 21 // -71 ``` --- 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)