There are several answers you can check out:

Is it possible to convert virtual machines to physical environments?

http://www.turnkeylinux.org/blog/convert-vm-iso

Acronis TrueImage is a commercial (but inexpensive) professional tool for making disk image backups. You can find it on Amazon. It provides various options but the option you want is whole disk backup. TrueImage comes on a bootable setup CD. You boot your VM off that, and back up your VMs drive to a real USB drive. You can then go to a real PC, boot that PC off the same CD, and restore the backup from the USB drive onto the hard drive of that PC. And that's it, V2P procedure completed.

https://forums.virtualbox.org/viewtopic.php?f=6&t=40124#wrap

There are several answers you can check out:

Is it possible to convert virtual machines to physical environments?

http://www.turnkeylinux.org/blog/convert-vm-iso

Acronis TrueImage is a commercial (but inexpensive) professional tool for making disk image backups. You can find it on Amazon. It provides various options but the option you want is whole disk backup. TrueImage comes on a bootable setup CD. You boot your VM off that, and back up your VMs drive to a real USB drive. You can then go to a real PC, boot that PC off the same CD, and restore the backup from the USB drive onto the hard drive of that PC. And that's it, V2P procedure completed.

https://forums.virtualbox.org/viewtopic.php?f=6&t=40124#wrap