Just sick of looking up this size conversion math. This should be in the BCL.

StorageConverter.cs

/* 
Usage:

var five = 5000.FromMB();
Console.WriteLine($"{five.ToKB()} KB");
Console.WriteLine($"{five.ToMB()} MB");
Console.WriteLine($"{five.ToGB()} GB");
Console.WriteLine($"{five.ToTB()} TB");
Console.WriteLine($"{five.ToPB()} PB");

Prints:
5000000 KB
5000 MB
5 GB
0.005 TB
5E-06 PB
*/

public static class StorageConverter
{	
	public static decimal FromBytes(this int input)     => (decimal)input;
	public static decimal FromBytes(this long input)    => (decimal)input;
	public static decimal FromBytes(this uint input)    => (decimal)input;
	public static decimal FromBytes(this ulong input)   => (decimal)input;
	public static decimal FromBytes(this float input)   => (decimal)input;
	public static decimal FromBytes(this double input)  => (decimal)input;
	public static decimal FromBytes(this decimal input) => (decimal)input;

	public static decimal FromKB(this int input)     => (decimal)(input * Math.Pow(10,3));
	public static decimal FromKB(this long input)    => (decimal)(input * Math.Pow(10,3));
	public static decimal FromKB(this uint input)    => (decimal)(input * Math.Pow(10,3));
	public static decimal FromKB(this ulong input)   => (decimal)(input * Math.Pow(10,3));
	public static decimal FromKB(this float input)   => (decimal)(input * Math.Pow(10,3));
	public static decimal FromKB(this double input)  => (decimal)(input * Math.Pow(10,3));
	public static decimal FromKB(this decimal input) => (decimal)(input * (decimal)Math.Pow(10,3));

	public static decimal FromMB(this int input)     => (decimal)(input * Math.Pow(10,6));
	public static decimal FromMB(this long input)    => (decimal)(input * Math.Pow(10,6));
	public static decimal FromMB(this uint input)    => (decimal)(input * Math.Pow(10,6));
	public static decimal FromMB(this ulong input)   => (decimal)(input * Math.Pow(10,6));
	public static decimal FromMB(this float input)   => (decimal)(input * Math.Pow(10,6));
	public static decimal FromMB(this double input)  => (decimal)(input * Math.Pow(10,6));
	public static decimal FromMB(this decimal input) => (decimal)(input * (decimal)Math.Pow(10,6));

	public static decimal FromGB(this int input)     => (decimal)(input * Math.Pow(10,9));
	public static decimal FromGB(this long input)    => (decimal)(input * Math.Pow(10,9));
	public static decimal FromGB(this uint input)    => (decimal)(input * Math.Pow(10,9));
	public static decimal FromGB(this ulong input)   => (decimal)(input * Math.Pow(10,9));
	public static decimal FromGB(this float input)   => (decimal)(input * Math.Pow(10,9));
	public static decimal FromGB(this double input)  => (decimal)(input * Math.Pow(10,9));
	public static decimal FromGB(this decimal input) => (decimal)(input * (decimal)Math.Pow(10,9));
	
	public static decimal FromTB(this int input)     => (decimal)(input * Math.Pow(10,12));
	public static decimal FromTB(this long input)    => (decimal)(input * Math.Pow(10,12));
	public static decimal FromTB(this uint input)    => (decimal)(input * Math.Pow(10,12));
	public static decimal FromTB(this ulong input)   => (decimal)(input * Math.Pow(10,12));
	public static decimal FromTB(this float input)   => (decimal)(input * Math.Pow(10,12));
	public static decimal FromTB(this double input)  => (decimal)(input * Math.Pow(10,12));
	public static decimal FromTB(this decimal input) => (decimal)(input * (decimal)Math.Pow(10,12));

	public static decimal FromPB(this int input)     => (decimal)(input * Math.Pow(10,15));
	public static decimal FromPB(this long input)    => (decimal)(input * Math.Pow(10,15));
	public static decimal FromPB(this uint input)    => (decimal)(input * Math.Pow(10,15));
	public static decimal FromPB(this ulong input)   => (decimal)(input * Math.Pow(10,15));
	public static decimal FromPB(this float input)   => (decimal)(input * Math.Pow(10,15));
	public static decimal FromPB(this double input)  => (decimal)(input * Math.Pow(10,15));
	public static decimal FromPB(this decimal input) => (decimal)(input * (decimal)Math.Pow(10,15));

	public static decimal FromEB(this int input)     => (decimal)(input * Math.Pow(10,18));
	public static decimal FromEB(this long input)    => (decimal)(input * Math.Pow(10,18));
	public static decimal FromEB(this uint input)    => (decimal)(input * Math.Pow(10,18));
	public static decimal FromEB(this ulong input)   => (decimal)(input * Math.Pow(10,18));
	public static decimal FromEB(this float input)   => (decimal)(input * Math.Pow(10,18));
	public static decimal FromEB(this double input)  => (decimal)(input * Math.Pow(10,18));
	public static decimal FromEB(this decimal input) => (decimal)(input * (decimal)Math.Pow(10,18));

	public static double ToKB(this decimal bytes) => (double)(bytes / (decimal)Math.Pow(10, 3));
	public static double ToMB(this decimal bytes) => (double)(bytes / (decimal)Math.Pow(10, 6));
	public static double ToGB(this decimal bytes) => (double)(bytes / (decimal)Math.Pow(10, 9));
	public static double ToTB(this decimal bytes) => (double)(bytes / (decimal)Math.Pow(10, 12));
	public static double ToPB(this decimal bytes) => (double)(bytes / (decimal)Math.Pow(10, 15));
	public static double ToEB(this decimal bytes) => (double)(bytes / (decimal)Math.Pow(10, 18));
}