Size Specific Partitions

[alphaomega16]

Is there an online calculator system or something to tell me what the hell I have to enter to get the correct size partition I want.

For example if you get a 1tb drive and want an 800gb partition you can't just enter 800000 etc.

 

[alphaomega16]

Multiply by 1024 rather than 1000, and it should be correct e.g. 819200

Some info as to why here:
https://en.wikipedia.org/wiki/Gibibyte

Ended up giving me 799GB instead of the 800

Edit
Just added another 1024 and its all good.