NTFS offers file based compression but the compression rate isn't displayed anywhere.

For any folder on an NTFS volume, NTFSRatio shows the size and the compression rate of this folder and also of its subfolders. Compression and decompression can be done inside NTFSRatio with immediate review of the result. Results can be printed or exported.

NTFSRatio can be called from the Explorer context menu of any folder.