Java - Converting bytes to megabytes

Question

I have the following code here:

long memoryUsedOnStartup = Runtime.getRuntime().totalMemory() -
Runtime.getRuntime().freeMemory();

and I'm using it for some statistical stuff in my program, but this returns it in kilobytes. Is there any reliable way to convert this to megabytes?

EDIT: It returns it in bytes, but I still need it in megabytes...

Solution

1 Kilobyte (KB) -> 2^10 = 1,024 Bytes

1 Megabyte (MB) -> 2^20 = 1,048,576 Bytes = 1,024 Kilobytes (KB)

public long freeMemory()

Return: an approximation to the total amount of memory currently available for future allocated objects, measured in bytes.

public long totalMemory()

Returns: the total amount of memory currently available for current and future objects, measured in bytes.

So when you are calculating memoryUsedOnStartup it's in bytes. If you want to get the result in Megabytes then you need to divide it by (1024 * 1024)

Comments

[Marged]

That is not the correct way. Check this with some real values. Besides that you should not uppercase the function name and KB