How Many Studs Do You Need?
Enter your wall length and stud spacing — get studs and plate lumber to buy, with door and window openings handled automatically.
Last updated: June 6, 2026
Wall Length (ft)
16" for load-bearing & drywall · 24" for non-load-bearing. Compare →
Sets the stud length you'll buy. Standard ceiling is 8 ft.
Openings
Each opening adds 2 studs for jacks & cripples.
Framing Order Summary
10
studs to order
Plate Lumber36 linear ft (3 boards)
Stud Length Needed92" (8 ft wall)
12 ft wall · 16" o.c. · 0 opening(s) · double top plate
Worked Examples
12 ft Wall — 16" o.c., No Openings
- Field studs: 144" ÷ 16 = 9, + 1 end = 10 studs
- Plates: 12 ft bottom + 24 ft top (double) = 36 linear ft
- 3 plate boards at 12 ft covers the run
20 ft Wall — 16" o.c., 1 Door + 1 Window
- Field studs: 240" ÷ 16 = 15, + 1 end = 16 studs
- Openings: 1 door (+2) + 1 window (+2) = +4 studs
- Total: 20 studs to order
- Plates: 20 + 40 = 60 linear ft
10 ft Wall — 24" o.c. (Non-load-bearing)
- Field studs: 120" ÷ 24 = 5, + 1 end = 6 studs
- 24" spacing uses fewer studs — check code for load-bearing walls first
- Plates: 10 + 20 = 30 linear ft
Stud Spacing Guide
| Spacing | Use | Notes |
|---|---|---|
| 16" o.c. | Load-bearing & most interior walls | Standard — solid drywall backing, code-friendly |
| 24" o.c. | Non-load-bearing, advanced framing | Fewer studs; needs 5/8" drywall and code check |
| 12" o.c. | Heavy loads, tall walls, tile backing | More studs; extra rigidity where needed |
Stud Types Around Openings
| Stud | Role |
|---|---|
| King stud | Full-height stud on each side of an opening, nailed to the header |
| Jack / trimmer stud | Shorter stud inside the king that supports the header ends |
| Cripple stud | Short stud above a header or below a window sill, kept on layout |
| Corner / partition | Extra studs at corners and T-intersections for backing & nailing |
Frequently Asked Questions
A 12 ft wall framed 16" on-center needs 10 studs: 144 inches ÷ 16 = 9, plus 1 for the far end. Add 2 studs per corner and 2 per door or window opening. Enter your wall length and spacing above for an exact count including plates.
16" on-center is the standard for load-bearing walls and most interior walls — it's required for many wall finishes and gives solid backing for drywall. 24" on-center uses fewer studs and is allowed for some non-load-bearing walls and advanced framing, but check your local code first.
Each opening needs king studs (full-height, on each side) plus jack/trimmer studs (support the header) and cripple studs (above/below the opening). This calculator adds 2 studs per opening to cover the jacks and cripples — the king studs usually fall on or near the regular layout.
Plates are the horizontal boards at the top and bottom of a wall that the studs attach to. The bottom plate (sole plate) runs the wall length once. The top plate is usually doubled on load-bearing walls, so it runs the wall length twice. This calculator totals the plate lumber you need in linear feet.
For an 8 ft ceiling, buy pre-cut studs at 92 5/8" — they account for the 1.5" bottom plate and double 1.5" top plate to land at 8 ft finished. For other heights, buy 8 ft (96") studs and cut to length. The calculator shows the stud length your wall height needs.
A standard 2×4 stud runs about $3–$6 each, and plate boards about $5–$12 each depending on length and lumber prices. A 12 ft wall costs roughly $40–$80 in framing lumber. Enable cost estimate in Advanced settings for your specific count.