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Wall Stud Count Calculator

Count the studs and plates you need to frame a wall.

How it is calculated

The wall length is entered in metres and the on-centre spacing in centimetres. The tool converts the length to centimetres, divides by the spacing, rounds down to a whole number and adds one for the end stud: studs = floor(length × 100 / spacing) + 1. Plate material is length × 3 metres, which is one bottom plate plus a double top plate.

Both inputs must be greater than zero. The count covers a plain straight run only: it does not add extra studs for corners, door or window openings, or a wall that is not a whole multiple of the spacing beyond the final end stud, so add those yourself. Spacing is measured centre to centre, not as the gap between studs.

Worked example

A wall 4.8 m long with studs at 40 cm on centre. Length in centimetres: 4.8 × 100 = 480. Divide by the spacing: 480 / 40 = 12 gaps. Add the end stud: 12 + 1 = 13 studs. Plates: 4.8 × 3 = 14.40 m (one bottom plus two top runs). With 60 cm spacing the same wall needs only 9 studs.

Try this example →

Common mistakes

  • Entering the length in centimetres or feet. The length box is in metres and the spacing in centimetres; a 4.8 m wall typed as 480 gives 1,201 studs.
  • Typing the clear gap between studs as the spacing. It is the distance from the centre of one stud to the centre of the next.
  • Forgetting the extra framing. Corners and door or window openings need additional studs that this count does not include.
  • Ordering plates by the wall length alone. Two top plates plus one bottom plate is three times the length, before any waste at the joints.
  • Assuming the last stud always lands at the wall end. For lengths that do not divide evenly the count rounds down, so the final gap is smaller or an extra stud is needed at the end.

About this calculator

This calculator estimates how many wall studs you need to frame a wall, based on the wall's length and the on-center (OC) spacing between studs — typically 16" or 24" in US residential framing. It divides the wall length by the spacing, adds one for the starting stud, and adds extras for corners, wall-end studs, and any door or window openings (king and jack studs).

Framers, DIY renovators, and contractors use this before ordering lumber for a stud wall, so they can also estimate the top and bottom plates (usually a double top plate and single bottom plate) needed to tie the studs together.

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Comments (1)

  • Editorial team

    Metric inputs matter here: 16 inches on centre is 40,64 cm and 24 inches is 60,96 cm, so typing 40 or 60 gives a slightly tighter layout than the imperial spacing. The figure is a bare run, so count the extra studs at corners, openings and where the wall ends between spacings, and keep a handful in reserve for bent or cracked pieces. What wall details would you like us to support next?

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