Some names can be used, i.e. kataytay, f0cus_m can be found on it, some can't i.e. hailykitty and teohweichin, xweiz.

 

What's wrong?

Heya weichin and welcome to the tip.it forums.

 

The calculators use hiscore data from the RuneScape website. Hiscores are a members only feature so if an account is f2p you would have to enter the stats manually rather than entering a name.

 

Accounts will sometimes remain on the hiscores for a period of time after becoming f2p, but eventually they will be removed from the hiscores (which will explain why one of your example accounts works on the calculator despite being currently f2p).

 

That should hopefully explain why that's happening, but if any further clarification is needed feel free to ask.

Ok, thanks :)