# Gypsum Partition Calculator: Boards, Studs and Track

> A gypsum (drywall) partition is a frame of metal studs set in floor and ceiling tracks, faced with gypsum boards on one or both sides. Its quantities follow from the partition area less openings, the number of board faces, the stud spacing and the lengths in which studs and track are supplied.

## What it calculates

For a straight run of drywall partition, the calculator gives:

- the number of **gypsum boards**, for the boarding chosen;
- the number of **stud lengths**, including door studs;
- the number of **floor and ceiling track lengths**;
- the **partition area**, which is also the insulation area if the cavity is filled.

## Inputs

**Partition length** and **height** are in feet. Height is to the slab, or to the ceiling the
partition stops at.

**Boarded on** chooses both sides, for a normal partition, or one side, for lining an
existing wall.

**Layers on each side** is one or two.

**Door openings** is the number of doors in the run.

The **assumptions** panel holds the board size, stud spacing, the length studs and track are
supplied in, the door opening size and the wastage allowance.

## Method

1. Area = length × height − doors × door width × door height.
2. Board faces = sides × layers.
3. Boards = area × faces × (1 + wastage) ÷ area of one board, rounded up.
4. Stud positions = length ÷ spacing, rounded up, + 1 end stud + 2 for each door.
5. Stud lengths = stud positions × (height ÷ supplied length, rounded up).
6. Track = 2 × length × (1 + wastage) ÷ supplied length, rounded up.

## Assumptions

| Assumption | Default | Notes |
| --- | --- | --- |
| Board size | 4 × 8 ft | Check the supplier's sizes |
| Stud spacing | 2 ft | Follow the system specification |
| Stud and track length | 12 ft | As supplied |
| Door opening | 3 × 7 ft | Change for wider or double doors |
| Wastage | 10% | Cuts around openings and at the ends |

## Limitations

- **Straight runs only.** Corners and junctions need extra studs; add each run separately.
- **Heights above the supplied stud length** need joined or longer studs; the calculator
  counts whole lengths, which the system may not permit.
- **Fire and acoustic ratings are not checked.** A rating belongs to a tested system, so
  boards, studs, layers and insulation must match its specification.
- **Openings other than doors** such as glazed panels, service hatches and ducts need
  their own framing.
- **Consumables are left out.** Screws, tape, jointing compound, sealant and fixings follow
  the manufacturer's rates.

## Worked example

A partition 20 ft long and 10 ft high with one door, single-boarded on both sides with 4 × 8
ft boards, studs at 2 ft and studs and track supplied in 12 ft lengths:

| Step | Calculation | Result |
| --- | --- | --- |
| Area | 20 × 10 − 1 × 3 × 7 | 179 sq ft (16.6 m²) |
| Board faces | 2 sides × 1 layer | 2 |
| Boards | 179 × 2 × 1.10 / 32, rounded up | 13 |
| Stud positions | 20 / 2 + 1 + 2 | 13 |
| Stud lengths | 13 × 1 | 13 |
| Track | 2 × 20 × 1.10 / 12, rounded up | 4 |

The partition needs **13 boards, 13 studs and 4 lengths of track**. With two layers on each
side, as a fire or acoustic partition might need, the boards rise to 25.

## How engineers use it

On a fit-out, partitions are drawn as types on the layout, each with a specification: board
type and layers, stud size and spacing, insulation, and the fire or acoustic rating it must
achieve. Quantities are then taken off for each partition type from the drawings, including
corners, junctions, deflection heads at the slab and the framing around doors and glazing.

## When a professional design must replace it

Use the calculator to estimate materials or check a supplier's quantities for a simple
partition. Replace it with a partition schedule and drawings before ordering, and wherever
the partition must achieve a fire or acoustic rating, is unusually tall, carries heavy
fixtures, or meets glazing or services. The rated system specification, not a rule of thumb,
decides what is built.

## Frequently asked questions

### How many gypsum boards do I need for a partition?

Work out the partition area less door openings, multiply by the number of board faces (two for a normal partition, more with double boarding), add a wastage allowance, and divide by the area of one board. A 20 ft by 10 ft partition with one door, single-boarded on both sides with 4 by 8 ft boards, needs 13 boards at 10% wastage.

### What stud spacing should I use?

Use the spacing in the board manufacturer's system specification for the partition you are building. Spacing depends on the board, the height, and any fire, acoustic or impact requirement. The calculator starts at 2 ft and lets you change it.

### Why are there extra studs at doors?

Each side of a door opening needs a stud to frame it and carry the door frame. The calculator adds two studs for every door. Heavy doors often need reinforced or doubled studs, which the system specification sets out.

### When does a partition need two layers of board?

Fire-rated and higher acoustic partitions often need two layers on each side, and sometimes insulation in the cavity. The rating comes from a tested system, so the number of layers, board type, stud and insulation must match that system's specification exactly.

### Are screws, tape and jointing compound included?

No. They follow the manufacturer's consumption rates for the chosen system and are usually estimated from the board area. Ask the supplier for the rates for the boards and system you are using.

## Sources

- [IS 2095 (Part 1)](https://standards.bis.gov.in/website/published-standards/department-wise) — Gypsum plaster boards: plain gypsum plaster boards

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Source: https://hagerstone.com/calculators/gypsum-partition-calculator