Off topic:Can I obtain my transcriptome size based on number of M uniquely mapped reads?

Question

[Pin.Bioinf]

Hello,

I mapped my .fastq files against genome and I got the mapping quality reports. I have that 60M - 70M reads were uniquely mapped and that my reads were 100bp in size.

Can I say that 60M * 100bp (6 000 000 000 bp = 6000 Mb) is the size of the transcriptome in that sample or am I completely wrong?

Thank you.