Wall stud calculator

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Wall Stud Calculator | Free UK Framing Tool
🪵 Stud Walling · UK Building Tool

Wall Stud Calculator

Calculate exactly how many studs, top plates, sole plates, and noggins you need for any partition or stud wall. Includes doors, windows, waste factor, and timber lineal metre totals.

🪵 Studs, plates & noggins
🚪 Doors & windows deducted
📐 400, 450 & 600mm centres
📦 Waste & wastage factor included
3
Stud spacings
400 · 450 · 600mm centres
47×
Common timber
47×100 & 47×75mm C16
10%
Waste allowance
Standard builder’s wastage
100%
Free to use
No sign-up needed
Free Tool

Calculate your stud wall timber

Enter your wall dimensions, stud spacing, and any openings to get an instant count of every timber piece you need — with a full materials list.

Your wall details

Fill in the fields below for an instant materials list

400mm centres are standard for 12.5mm plasterboard. 600mm centres suit non-load-bearing partition walls.

Wall dimensions
m
m

47×100mm is the most common UK partition stud size. Use 47×125mm or 47×150mm for load-bearing walls.

Noggins are horizontal timbers between studs for rigidity. One mid-height row is standard for partition walls.

Openings (optional)
doors

Standard internal door: 838×1981mm

windows

Standard window: 1200×1050mm

Additional options
10%

10% is standard. Increase to 15–20% for complex walls with many cuts or openings.

Your Materials List

Stud count, plates, noggins & lineal metres

🪵

Enter your wall length, height, and stud spacing, then click Calculate to get a complete materials list with stud count, plates, and noggins.

Timber Guide

Stud wall components explained

A stud wall is made up of several types of timber. Understanding each component helps you order the right lengths and avoid waste.

📏

Vertical Studs

The main upright timbers spaced at regular centres (400, 450, or 600mm). They run the full height between sole plate and top plate and carry any load from above.

Full wall height Regular spacing Load-bearing
🔲

Sole & Top Plates

Horizontal timbers at the bottom (sole plate) and top (top plate) of the wall frame. They tie the studs together and transfer load to the floor structure and ceiling/joists above.

Full wall length Same timber size Double if load-bearing
➖

Noggins

Short horizontal timbers fitted between studs to prevent them twisting and to add rigidity. Also used to provide fixing points for heavy items like shelving, radiators, and TV brackets.

Between studs Mid-height std Prevents twisting
🚪

Door Trimmers & Lintels

Door openings require extra studs (trimmers/cripple studs) on each side and a lintel (head) timber above. These transfer load around the opening back to the main frame.

2 trimmers per door Head / lintel Cripple studs above
🪟

Window Openings

Windows need trimmers, a head timber, a sill timber, and cripple studs below the sill. The opening is deducted from the stud count but the extra framing timbers are added back.

Sill & head Trimmers Cripple studs
🏗️

Corner & Partition Posts

Where walls meet at corners or T-junctions, extra studs are added to provide a fixing surface for plasterboard on both faces. A 2-stud or 3-stud corner detail is most common.

2 or 3 stud corner T-junction fix Board backing
Reference

Stud spacing quick reference

How many studs do you need per metre? Use this table for a quick manual check of your calculator results.

Wall length @ 400mm c/c @ 450mm c/c @ 600mm c/c Best use
1.0 m 3 studs 3 studs 2 studs Alcove / short wall
2.0 m 6 studs 5 studs 4 studs Bathroom partition
3.0 m 8 studs 8 studs 6 studs Standard room
4.0 m 11 studs 10 studs 8 studs Living room divider
5.0 m 14 studs 12 studs 10 studs Open plan partition
6.0 m 16 studs 15 studs 11 studs Large partition
Design Decisions

What affects your stud wall design?

The right stud wall specification depends on its purpose, what’s going on it, and whether it carries any structural load.

🏋️

Load-bearing vs partition

Load-bearing walls carry floor or roof loads above — these need larger studs (47×100mm minimum), a double top plate, and engineer’s approval. Partition walls only support their own weight.

🔊

Acoustic performance

For better sound insulation, use staggered studs on separate sole and top plates, or a double stud wall with an air gap. Mineral wool insulation in the cavity makes a significant difference.

🌡️

External walls & insulation

External stud walls need deeper timbers (47×125mm or 47×150mm) to accommodate full-fill insulation and achieve the required U-values under Part L of the Building Regulations.

🧱

Plasterboard size

Standard 1200mm-wide plasterboard sheets require studs at 400mm or 600mm centres so joints always fall on a stud. 450mm centres suit 900mm-wide boards or timber cladding.

💧

Wet areas (bathrooms)

In bathrooms and wet rooms, use moisture-resistant (MR) plasterboard and consider pressure-treated timber. Extra noggins at tile or panel fixing heights are recommended.

📐

Timber grade & moisture content

Use C16 or C24 graded timber for structural work. Ensure moisture content is below 20% before plasterboarding to prevent later shrinkage, nail-popping, and cracking.

About This Tool

Estimates based on real timber data

Our wall stud calculator uses standard UK framing rules: studs at regular centres plus 1 extra, plates run the full wall length, and noggins fill the bays between studs.

We apply door and window deductions correctly, add the framing timbers around openings, and include your chosen waste factor — so you order the right amount, not a rough guess.

  • ✓Correct stud count for 400, 450, and 600mm centres
  • ✓Sole plate, top plate, and double top plate options
  • ✓Noggin rows calculated for correct bay count
  • ✓Door and window openings correctly deducted
  • ✓Waste factor and corner posts included
  • ✓Total lineal metres for merchant ordering
Help & Info

Stud wall FAQs

How many studs do I need per metre of wall?
The formula is: divide wall length in mm by stud spacing in mm, then round up and add 1 for the end stud. For a 3m wall at 400mm centres: 3000 ÷ 400 = 7.5, round up to 8, add 1 = 9 studs. At 600mm centres the same wall needs: 3000 ÷ 600 = 5, add 1 = 6 studs. Always add 1 because you need a stud at both ends of the wall.
For standard internal partition walls, 47×100mm C16 graded timber is the most common choice and suits walls up to 3.6m high. For taller walls or where the stud carries any load, use 47×125mm or 47×150mm. Lightweight partitions in dry, single-storey situations can use 47×75mm. Always check with a structural engineer if the wall could be load-bearing.
Noggins are not always legally required in light partition walls, but they are strongly recommended. They prevent studs from twisting and bowing over time, which causes plasterboard cracking. Building Regulations typically require noggins for walls over a certain height or in load-bearing applications. One row at mid-height is standard; add a second row for walls over 2.7m high or where you’re fixing heavy items like kitchen units, radiators, or TV wall mounts.
400mm centres are the UK standard for plasterboard-lined walls because a 1200mm-wide plasterboard sheet spans exactly 3 stud bays, with each edge landing on a stud. 450mm centres suit timber cladding or situations where 900mm-wide boards are used. 600mm centres are used for lightweight, non-load-bearing partition walls or where sheeting materials are 1200mm wide and thicker (e.g. 15mm board). For anything structural, stick with 400mm.
A door opening requires: 2 king studs (full-height studs on each side of the opening), 2 trimmer/jack studs (shorter studs that support the head timber), 1 head/lintel timber across the top of the opening, and cripple studs from the head up to the top plate if the door doesn’t reach the top plate. The door opening width should allow for the frame, so add 100mm to the door leaf width for a standard frame with a 10mm gap each side.
10% is the standard waste allowance for a straightforward stud wall. Increase to 15% if there are multiple openings, angled cuts, or awkward geometry. 20% is appropriate for complex rooms or if you’re ordering timber lengths that don’t exactly match your stud height (e.g. buying 2.4m lengths for 2.35m studs wastes 50mm per piece). It’s always cheaper to have a few spare timbers than to make an extra trip to the merchant.
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