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Roofing & Framing

Wall Stud Calculator

This stud calculator counts studs and plates for a framed wall; our home addition guide covers framing and structural basics. Count the studs and plates for a framed wall. The base count is one stud per spacing plus one to close the end; then add studs for corners, intersections and the king, jack and cripple studs around doors and windows.

Results from this stud calculator are planning estimates; confirm quantities and prices with your supplier or contractor before you order.

Enter your project

ft
in
m

Typically 2–4 (king, jack, cripples) — follow your framing plan.

ft
%

Extra for cuts, breakage and spillage.

Results

Your results will appear here

Enter your measurements and press Calculate. Defaults show a typical example.

How to use the stud calculator

  1. Enter the wall length and stud spacing.
  2. Add corners or intersections and the number of door/window openings.
  3. Adjust extra studs per opening to match your framing plan.
  4. Choose single or double top plates.

Formula

Studs = ⌊length (in) ÷ spacing⌋ + 1 + corners × extra + openings × extra, then waste. Plate length = wall length × number of plates.

Worked example

A 20 ft wall at 16 in o.c.: 240 ÷ 16 = 15, + 1 = 16 studs. With one window (3 extra) and 10% waste, about 21 studs, plus 60 ft of plate.

Tips for using the stud calculator

  • Count every door and window: each opening adds king and jack studs plus cripples.
  • Add studs for corners, wall intersections and blocking for cabinets or grab bars.
  • Buy a few extra studs to replace bowed or twisted boards before you frame.
  • Frame long walls in sections you can lift safely, and snap chalk lines for the plates first so every stud lands on its layout mark at 16 or 24 in on center.
Looking up through the new wood stud and rafter framing of a house

Stud Calculator FAQs

Is it 1 stud per foot?

At 16 in on center you need about 0.75 studs per foot plus extras; a common shortcut is one stud per linear foot to cover corners, openings and waste.

16 or 24 inches on center?

Both are used. 24 in o.c. ("advanced framing") uses less lumber but has limits on wall height, loads and sheathing; your code and plans decide.

What about headers?

Header size depends on the span and load. Use your local code's header tables or an engineer.

Estimate before you call a contractor

Run the numbers with our free calculators so you can compare bids with confidence.

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