Getting the final disk size of a streamOptimized VMDK

[emc]

I have a *.vmdk:

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>VBoxManage.exe showmediuminfo disk1.vmdk
...
State:          created
Type:           normal (base)
Location:       disk1.vmdk
Storage format: VMDK
Format variant: dynamic streamOptimized
Capacity:       130048 MBytes
Size on disk:   20143 MBytes
Encryption:     disabled

Now i want to clone it to VDI so i can use it, but i need to know the final size (which is somewhere between the vmdk size and the maximum capacity).
The command:

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VBoxManage clonemedium disk1.vmdk disk1.vdi --format VDI --variant Standard

just starts the conversion process without telling me how much diskspace is needed. Is there any way to read the information (doesn't have to be the exact size of the dynamic VDI, the size of the uncompressed MONOLITHIC_SPARSE VMDK is fine too) from the VMDK or do some sort of "dry run" to get the VDI size without actually using up disk space?

[emc]

Haven't found an easy way, maybe the uncompressed size is not included in the VMDK, but i was able to mount the image and then look at the information from the filesystem inside. (Btw: ~42GB)