◧MeasureThenConstruction Calculators

Stud Calculator

Calculate the number of wall studs needed.

Mason ReidFounder and Lead Estimator at MeasureThen

Last updated 2026-08-21

What Is a Stud Calculator?

A stud calculator finds the number of vertical wall studs needed for a straight run of wall at your chosen on center spacing. It is the most direct way to answer how many studs for a given wall length. Homeowners use it to plan a partition wall or to order lumber for a new room.

How It Works

Studs = ceil((Wall Length × 12) ÷ Stud Spacing) + 1.

Example

For a 24 ft wall at 16 in spacing: ceil(288 ÷ 16) + 1 = 19 studs.

How to Calculate

  1. Measure the length of the wall run in feet. For example, a 24 foot wall.
  2. Multiply the length by 12 to convert to inches. Twenty four feet is 288 inches.
  3. Divide by your stud spacing. At 16 inches on center, 288 divided by 16 equals 18 spaces.
  4. Add one stud for the end of the wall, giving 19 studs.
  5. If you are using 24 inch spacing on a non load bearing wall, divide 288 by 24, which is 12, plus 1 equals 13 studs.

Stud Count by Wall Length and Spacing

Wall Length16 in OC24 in OC
8 ft75
10 ft96
12 ft107
16 ft139
20 ft1611
24 ft1913

Sources

Frequently Asked Questions

What is "on center" spacing?

It is the distance between the center of one stud and the center of the next — 16 in is standard.

Do I need to add for corners and openings?

Yes. This is the basic stud count; corners, T-walls, and openings add extra studs.

What stud size should I use?

2×4 studs suit most interior and single-story walls; 2×6 for exterior walls with more insulation.

Estimate the cost with the Lumber Cost Calculator or browse Lumber Calculators

More Lumber Calculators

Board Feet CalculatorFind the board footage of lumber by entering thickness, width, and length. Add a price per board foot to estimate cost for your project.Lumber CalculatorEstimate lumber quantities and board feet for a project.2x4 CalculatorCalculate the number of 2x4s needed for framing.Framing CalculatorCalculate the exact number of wall studs, plates, and framing lumber. Set stud spacing for 16 in or 24 in on center and account for openings.Lumber Cost CalculatorEstimate the total cost of lumber from board feet and price per board foot. Adjust for species, waste, and quantity to budget your project.

Mason ReidFounder and Lead Estimator at MeasureThen

Mason Reid founded MeasureThen after two decades of hands-on work in construction and estimating. Across residential and light commercial projects, he sized concrete pours, framed walls, hung drywall, and priced out roofing, fencing, and deck work — learning the exact math that every job depends on. At MeasureThen he writes the formulas, checks every calculator against real-world assumptions, and makes sure each one is simple enough for a homeowner to trust and a contractor to use. When he is not measuring twice, he is helping projects stay on budget.

Every MeasureThen calculator uses simple, transparent formulas and standard industry assumptions drawn from common construction practice. We show the math behind each result and include worked examples so you can follow along and double-check the numbers. Results are estimates: materials, labor, and pricing vary by region and market, so always confirm important figures with a licensed professional and your local building codes.