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 If prices appear to be outdated, purge the page by clicking here.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 battlestaff8,268 Mystic air staff24,476 -23,792 -10,792
Water Water battlestaff8,291 Mystic water staff24,569 -23,722 -10,722
Earth Earth battlestaff8,349 Mystic earth staff24,401 -23,948 -10,948
Fire Fire battlestaff8,290 Mystic fire staff24,156 -24,134 -11,134
Lava Lava battlestaff9,251 Mystic lava staff40,034 -9,217 3,783
Mud Mud battlestaff19,727 Mystic mud staff55,775 -3,952 9,048
Steam Steam battlestaff17,445 Mystic steam staff57,656 211 13,211
*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.