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Message: <blockquote data-quote="der_kluge" data-source="post: 1303313" data-attributes="member: 945">Artificer's Handbook cost:10gp(4 + 7 -1) * 5^2 = 100*25 = 2,500gpThat's as a spell completion item (which means the user has to be able to cast the spell).  For a spell trigger item, the cost is:100*6^2 = 3,600gpThese are creation costs.  The market costs would be 5,000gp and 7,200gp respectively.How I derived it:4 = Spell level, 7 = Caster level.  The -1 is part of the formula.  5 is the number of spell slots required -> 2 for spell completion (3 for spell trigger) and +3 for "1 use per week"  That's a total of 5 (or 6) spell slots, which is then squared. There is no provision for a 10-day week, but you could reduce the cost by some percentage.  A 10 day week is 42% longer than a 7 day week, and you could choose to reduce the cost of the item by that much if you so desired.</blockquote>