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 If prices appear to be outdated, purge the page by clicking here.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 battlestaff8,229 Mystic air staff24,755 -23,474 -10,474
Water Water battlestaff8,227 Mystic water staff24,574 -23,653 -10,653
Earth Earth battlestaff8,347 Mystic earth staff24,457 -23,890 -10,890
Fire Fire battlestaff8,228 Mystic fire staff24,443 -23,785 -10,785
Lava Lava battlestaff9,181 Mystic lava staff37,306 -11,875 1,125
Mud Mud battlestaff18,096 Mystic mud staff59,504 1,408 14,408
Steam Steam battlestaff30,379 Mystic steam staff74,634 4,255 17,255
*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.