Often you'll find computer or Hard Drive ads with "x capacity" and, when you check it, the storage system never has that capacity (I'll call it as "Commercial").
Well, CommercialToReal.com gives you the real capacity of a storage system from the commercial capacity. To do this you only have to indicate it with her unit:

Explication:

Unit Value Bytes 0 kB 1 MB 2 GB 3 TB 4 PB 5 EB 6

$\mathrm{Real}={\mathrm{Commercial}*\left(\frac{1000}{1024}\right)}^{\mathrm{^unit}}$