Human Readable Byte Conversion in T-SQL June 1, 2015
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A great post I found for doing human readable byte value conversion here:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: Number2 (John Nelson) – http://number2blog.com
-- Create date: 01-10-2006
-- Modified: 09-04-2008 – Added ZB, YB, BB, GeopBytes and allow larger input numbers
-- Description: Format bytes as largest unit (KB, MB, GB, TB, PB, EB, ZB, YB, BB, Geopbytes)
-- Will take any unit of measurement as input (bytes,
-- KB, MB, GB, TB, PB, EB, ZB, YB, BB, Geopbytes) and converts them first to
-- bytes, then formats that as the largest whole UOM in
-- a human readable format. 1024MB becomes 1.00GB, 0.5GB
-- becomes 512MB, etc.
-- INPUT: @InputNumber – Decimal(38,2)
-- =============================================
CREATE FUNCTION [dbo].[udf_FormatBytes]
(
@InputNumber DECIMAL(38,7),
@InputUOM VARCHAR(5) = 'Bytes'
)
RETURNS VARCHAR(20)
WITH SCHEMABINDING
AS
BEGIN
-- Declare the return variable here
DECLARE @Output VARCHAR(48)
DECLARE @Prefix MONEY
DECLARE @Suffix VARCHAR(6)
DECLARE @Multiplier DECIMAL(38,2)
DECLARE @Bytes DECIMAL(38,2)

SELECT @Multiplier =
CASE @InputUOM
WHEN 'Bytes' THEN 1
WHEN 'Byte' THEN 1
WHEN 'B' THEN 1
WHEN 'Kilobytes' THEN 1024
WHEN 'Kilobyte' THEN 1024
WHEN 'KB' THEN 1024
WHEN 'Megabytes' THEN 1048576
WHEN 'Megabyte' THEN 1048576
WHEN 'MB' THEN 1048576
WHEN 'Gigabytes' THEN 1073741824
WHEN 'Gigabyte' THEN 1073741824
WHEN 'GB' THEN 1073741824
WHEN 'Terabytes' THEN 1099511627776
WHEN 'Terabyte' THEN 1099511627776
WHEN 'TB' THEN 1099511627776
WHEN 'Petabytes' THEN 1125899906842624
WHEN 'Petabyte' THEN 1125899906842624
WHEN 'PB' THEN 1125899906842624
WHEN 'Exabytes' THEN 1152921504606846976
WHEN 'Exabyte' THEN 1152921504606846976
WHEN 'EB' THEN 1152921504606846976
WHEN 'Zettabytes' THEN 1180591620717411303424
WHEN 'Zettabyte' THEN 1180591620717411303424
WHEN 'ZB' THEN 1180591620717411303424
WHEN 'Yottabytes' THEN 1208925819614629174706176
WHEN 'Yottabyte' THEN 1208925819614629174706176
WHEN 'YB' THEN 1208925819614629174706176
WHEN 'Brontobytes' THEN 1237940039285380274899124224
WHEN 'Brontobyte' THEN 1237940039285380274899124224
WHEN 'BB' THEN 1237940039285380274899124224
WHEN 'Geopbytes' THEN 1267650600228229401496703205376
WHEN 'Geopbyte' THEN 1267650600228229401496703205376
END

SELECT @Bytes = @InputNumber*@Multiplier

SELECT @Prefix =
CASE
WHEN ABS(@Bytes) < 1024 THEN @Bytes --bytes
WHEN ABS(@Bytes) < 1048576 THEN (@Bytes/1024) --kb
WHEN ABS(@Bytes) < 1073741824 THEN (@Bytes/1048576) --mb
WHEN ABS(@Bytes) < 1099511627776 THEN (@Bytes/1073741824) --gb
WHEN ABS(@Bytes) < 1125899906842624 THEN (@Bytes/1099511627776) --tb
WHEN ABS(@Bytes) < 1152921504606846976 THEN (@Bytes/1125899906842624) --pb
WHEN ABS(@Bytes) < 1180591620717411303424 THEN (@Bytes/1152921504606846976) --eb
WHEN ABS(@Bytes) < 1208925819614629174706176 THEN (@Bytes/1180591620717411303424) --zb
WHEN ABS(@Bytes) < 1237940039285380274899124224 THEN (@Bytes/1208925819614629174706176) --yb
WHEN ABS(@Bytes) < 1267650600228229401496703205376 THEN (@Bytes/1237940039285380274899124224) --bb
ELSE (@Bytes/1267650600228229401496703205376) --geopbytes
END,
@Suffix =
CASE
WHEN ABS(@Bytes) < 1024 THEN ' Bytes'
WHEN ABS(@Bytes) < 1048576 THEN ' KB'
WHEN ABS(@Bytes) < 1073741824 THEN ' MB'
WHEN ABS(@Bytes) < 1099511627776 THEN ' GB'
WHEN ABS(@Bytes) < 1125899906842624 THEN ' TB'
WHEN ABS(@Bytes) < 1152921504606846976 THEN ' PB'
WHEN ABS(@Bytes) < 1180591620717411303424 THEN ' EB'
WHEN ABS(@Bytes) < 1208925819614629174706176 THEN ' ZB'
WHEN ABS(@Bytes) < 1237940039285380274899124224 THEN ' YB'
WHEN ABS(@Bytes) < 1267650600228229401496703205376 THEN ' BB'
ELSE ' Geopbytes'
END

-- Return the result of the function
SELECT @Output = CAST(@Prefix AS VARCHAR(39)) + @Suffix
RETURN @Output

END
GO

-- GIVE PERMISSIONS FOR WEB REPORTS
--GRANT EXECUTE ON dbo.udf_FormatBytes TO webreport_approle, smsschm_users
--GO

-- NOW TEST IT

SELECT dbo.udf_FormatBytes(22345,'Bytes')

SELECT dbo.udf_FormatBytes(8675309,'MB')

SELECT dbo.udf_FormatBytes(0.5,'GB')