Wall Framing Calculators
Stud count is spacing, openings and corners — not wall length divided by 16. The spacing comparison prices what moving to 24 in. on center actually saves.
There are 2 calculators here: Wall Stud Count & Lumber Cost Calculator (stud count, plates and lumber cost for a framed wall) and 16 vs 24 On-Center Stud Cost Calculator (what wider stud spacing saves, and what it costs elsewhere).
They all work the same way: quantity first, then a waste allowance you can change, then a price built from verified figures and adjusted for your state. Cost is always a range rather than a single number, and every assumption behind it is printed on the page with its source and the date it was last checked.