This is a static calculator.
It does not take user inputs, but it does use changing prices from the Grand Exchange Market Watch. If prices appear to be outdated, purge the page by clicking here.

This calculates the profit/loss of paying Thormac to change a battlestaff into a mystic staff. It normally costs 40,000 per conversion, but this is reduced to 27,000 when wearing a Seer's headband 3.

Battlestaff Battlestaff
staff cost
(no headband)
Air Air battlestaff8,285 Mystic air staff24,695 -23,590 -10,590
Water Water battlestaff8,376 Mystic water staff24,410 -23,966 -10,966
Earth Earth battlestaff8,394 Mystic earth staff24,421 -23,973 -10,973
Fire Fire battlestaff8,354 Mystic fire staff24,469 -23,885 -10,885
Lava Lava battlestaff9,107 Mystic lava staff36,310 -12,797 203
Mud Mud battlestaff22,689 Mystic mud staff57,176 -5,513 7,487
Steam Steam battlestaff32,483 Mystic steam staff70,959 -1,524 11,476
*Note: You can buy up to 1000 battlestaffs of a given type every 4 hours in the Grand Exchange.

Warning: do NOT expect any of these to be profitable. They normally sell for well below the GE asking price.