How to use a stud finder properly
Why stud finders give false readings and the technique that produces accurate results every time.
Riley Brand
February 12, 2026
Calibrate first
Place the stud finder flat on a wall section that's likely empty (middle of a wall, not near corners). Press the button to calibrate.
If you calibrate over a stud, the entire wall will read as 'no stud' — a common mistake.
Find both edges
Slide slowly to the right. The finder beeps or lights up when it detects a stud edge. Mark with a pencil.
Continue past the stud and find the far edge. Mark again. The actual center is between the marks. Studs are typically 1.5 inches wide.
Verify with a second method
Studs are typically 16 inches apart on center (sometimes 24). Find one stud, then measure 16 inches over and check.
If the second location also reads as a stud, you've confirmed the spacing. If not, adjust your search.
People also ask
Why is my stud finder unreliable?+
Cheap stud finders are often hit-or-miss. A magnetic stud finder ($10–15) detects drywall screws, which are always in studs — more reliable than electronic ones.
Plaster walls — different rules?+
Stud finders struggle with plaster. Use a small drill with a fine bit; if it bites with resistance, that's a stud.
Around outlets and switches — be careful?+
Yes. Outlet boxes are attached to studs, so studs are usually 1 inch left or right of an outlet. Skip the stud finder; measure from the outlet.