User Defined Function (UDF) to Convert Weight between Kilograms and Pounds in SQL Server

To create a User Defined Function (UDF) that converts weight from Kilograms to Pounds, that uses decimal(7,3) data type with precision 7 and scale 3 for input and output weight values, use the following command:

CREATE FUNCTION [dbo].[ufn_kg2lb] (@kg decimal(7,3))
RETURNS decimal(7,3)
AS
BEGIN
RETURN (@kg * 2.20462)
END

To use this user-defined function (for example to convert 34.148 kg to lb):

SELECT dbo.ufn_kg2lb (34.148)

ufn_kg2lb

To create a User Defined Function (UDF) that converts weight from Pounds to Kilograms, that uses decimal(7,3) data type with precision 7 and scale 3 for input and output weight values, use the following command:

CREATE FUNCTION [dbo].[ufn_lb2kg] (@lb decimal(7,3))
RETURNS decimal(7,3)
AS
BEGIN
RETURN (@lb * 0.453592)
END

To use this user-defined function (for example to convert 142.561 lb to kg):

SELECT dbo.ufn_lb2kg (142.561)

ufn_lb2kg