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Framing Calculator

How many studs is that wall, really?

Framing lumber counts follow simple rules, but getting them wrong means a mid-job lumber run or a pile of wasted studs. This calculator applies the standard carpentry count — one stud per spacing interval plus a starter, king/jack/cripple studs around every opening, extras at corners, and single-bottom-plus-double-top plates — so your order matches the plan.

Why people use this

DIYers standing in the lumber aisle and estimators pricing a basement finish both use this: the stud-count rules are simple but the openings-and-corners arithmetic is where orders go wrong. Contractors use the cost layer as a first-pass bid check before quoting.

How it works

1. Enter the wall length, height, and stud spacing (16" on center is standard for load-bearing walls).
2. Count door and window openings and corners/intersections.
3. Read the stud count, plate boards (8-ft), and total plate linear feet.
4. Open the cost section to add editable unit costs and a labor rate for a project total.

Common questions

How many studs do I need for a 20-foot wall?

At 16" on center: ⌈20 × 12 ÷ 16⌉ + 1 = 16 studs before openings and corners. Each door or window opening adds about 4 studs (king, jack, and cripples), and each corner adds 1.

Should I frame at 16 or 24 inches on center?

16" on center is the default for load-bearing walls and anywhere you will hang heavy cabinets or tile. 24" on center (advanced framing) saves roughly 30% on studs and improves insulation, but check your local code — some jurisdictions and wind/seismic zones require 16".

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