Compression space tool like deduplication tool

Hi

Is there an equivalent tool to the depulication tool (DDPEval.exe) for normal NTFS File compression ? i.e. reports the saving without doing the actual transformation ?

i.e. instead of doing this over hours and hours, can you runa tool to tell you the space saving by using compression ?

then this can be compared to the theoretical space saving using deduplication (ddpeval)

Thanks