BuildProjectCalc
Lumber & Framing

Wall Stud Calculator

Estimate whole wall studs for multiple runs using a user-selected spacing, two endpoints per run, and optional waste.

Project measurements

Measurement system

Basic quantity planning only. Spacing and plate inputs are editable assumptions; this tool does not design structural walls or interpret codes.

Wall run 1

Editable planning assumption—not a universal requirement.

How to use this calculator

  1. Add each separate wall run.
  2. Enter the selected stud spacing.
  3. Choose a waste allowance.
  4. Review the per-run base count and purchase quantity.

How the calculation works

Each wall run is divided by the entered spacing and rounded upward to a whole number of spaces. One stud is added for the second endpoint. Waste applies after all run counts are combined.

Formula

Spaces per run = ceil(run length × 12 ÷ spacing in inches)
Studs per run = spaces + 1
Purchase studs = ceil(total studs × (1 + waste %))

Worked example

A 20 ft wall at an entered 16 in spacing needs `ceil(240 ÷ 16) + 1 = 16` studs. With 10% waste, the purchase count rounds to 18.

Project considerations

  • Spacing is an editable planning assumption, not a universal requirement.
  • Each separate run receives two endpoints; shared corners require project-specific adjustment.
  • Openings, corners, headers, blocking, bracing, loads, and building codes are not designed.

Frequently asked questions

Does this require 16-inch spacing?

No. The displayed spacing is only an editable example.

Why are endpoints counted for every run?

Each entered run is treated independently so the assumption stays clear and the per-run breakdown is reproducible.