thank you so much! I don't think I was using the right keywords. I completely missed this!
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have you looked around on the forum already?
eg. this thread: Calculate length of sequences from fasta file
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File you linked has the sizes of the chromosomes. These files are available from UCSC (if you are working with a genome there) or you can simply add up the nucleotides in your fasta file for each sequence and make that file. e.g.
faslenfrom this.