How many studs do I need for a stud wall?

Divide the wall length in millimetres by your stud centres (commonly 400mm or 600mm) and add 1 for the starting stud. Then add 2 studs for every corner and 4 studs for every door or window opening, and round up 5-10% for waste.

How many studs does a door or window opening add?

A typical opening adds 4 studs: 2 full-height king studs plus 2 shorter jack (trimmer) studs that support the head timber (header). Noggins above the head are usually cut from stud offcuts.

What thickness should I use for the head and sole plates?

This calculator assumes 45mm timber for both the sole plate and a doubled head plate, standard for load-bearing stud/timber-frame studwork, so 45mm + 2 x 45mm = 135mm is subtracted from wall height to get the stud cut length.

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UK Timber Framing Calculator

A production-grade stud wall calculator built for UK studwork: enter your wall length, height, stud centres, corners and openings to get an exact stud count, cut length and head/sole plate timber, plus a live wall diagram that redraws itself from your own numbers.

Studs to buy

21 studs

Field studs (on-centre)—

Corner studs (+2 per corner)—

Opening king + jack studs—

Stud cut length—

Head & sole plate timber—

Live wall diagram

Drawn from your wall length, centres, wall ends and openings — not a stock image.

Stud count breakdown

Where the total stud count comes from.

How to Calculate How Many Studs You Need

Building a stud wall comes down to four numbers: how many field studs the stud centres call for, how many extra studs each corner needs, how many extra studs each door or window opening needs, and a waste allowance for cutting mistakes and damaged timber.

Step 1 — Field studs from stud centres

Convert wall length to millimetres, divide by your stud centres (600mm suits standard 12.5mm plasterboard; 400mm is used for thicker boards or extra stiffness), then add 1 for the stud that starts the run.

Step 2 — Add corner studs

Each corner needs a 3-stud post so both intersecting stud walls have plasterboard backing, 2 studs more than the field stud already counted at that end.

Step 3 — Add opening studs

Every door or window opening needs 2 full-height king studs and 2 shorter jack (trimmer) studs that carry the head timber's load down to the sole plate, 4 studs per opening. Short noggins (the UK term for the horizontal blocking pieces) above the head are typically cut from stud offcuts.

Step 4 — Round up for waste

Add 5-10% on top of the raw total to cover bowed or split timber, cutting errors, and last-minute layout changes, then round up to a whole stud.

field studs = floor(wall length in mm ÷ stud centres) + 1
corner studs = corners × 2 · opening studs = openings × 4
studs to buy = ceil((field + corner + opening) × (1 + waste%))
stud cut length = wall height − (sole plate 45mm + doubled head plate 90mm)

Worked example

A 6 m wall, 2.4 m tall, framed at 600mm centres with corners at both ends and one door opening: field studs = floor(6000 ÷ 600) + 1 = 11. Corners add 2 × 2 = 4. The opening adds 4 more. That's 19 studs before waste; with a 10% allowance, ceil(19 × 1.10) = 21 studs. Each stud is cut to 2400mm − 135mm = 2265mm. The three plate runs need 6 m × 3 = 18 linear metres of timber, or six 3.6 m lengths after a small seam allowance.

Types of Studs in a Timber Stud Wall

Every timber stud wall is built from a handful of member types, each doing a different job. The diagrams below highlight one member at a time against the rest of the same opening, drawn in scale to real studwork, not stock photography.

Common (Field) Stud

The full-height stud repeated at every centre mark — 400mm or 600mm apart — that makes up most of a wall.

King Stud

Full-height studs on both sides of an opening, running plate to plate, that the head timber (header) hangs from.

Jack (Trimmer) Stud

Shorter studs fixed to the inside of each king stud, cut to the opening height, that carry the head timber's load to the sole plate.

Noggin (Cripple Stud)

Short filler pieces above a head timber (and below a window cill), on the same layout as the field studs but cut shorter.

Corner Post (3-Stud Corner)

Three studs grouped where two stud walls meet (plan view above), giving plasterboard backing on both faces.

Partition T-Post

Where an internal partition meets a continuous wall, extra studs form a "T" so both sides of the junction have plasterboard backing too.

Frequently asked questions

How many studs do I need for a wall?

Field studs from wall length ÷ centres + 1, plus 2 per corner and 4 per opening, then round up 5-10% for waste.

What stud centres does UK studwork use?

600mm suits standard 12.5mm plasterboard; 400mm is used for thicker boards, tighter deflection, or extra load.

How many extra studs does a corner need?

A standard 3-stud corner adds 2 studs beyond the field stud already counted.

How many studs does an opening add?

4: two full-height king studs plus two jack (trimmer) studs. Noggins above the head are usually cut from offcuts.

What thickness do you assume for the plates?

45mm sole plate and a doubled 90mm head plate, standard for load-bearing studwork.