# Classroom Capacity Calculator

> Find how many students a classroom holds from its size, space reserved for the teacher and furniture, the area allowed per student and any occupancy limit.

Category: Education · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/classroom-capacity-calculator

Capacity is the usable floor area divided by the space each student needs, rounded down, and never more than any occupancy limit set for the room.

Also called: Room capacity calculator, Classroom size calculator.

## Inputs
- Units (options: Metres, Feet; default metric)
- Room length (default 9)
- Room width (default 7)
- Area reserved (teacher zone, storage, aisles) (default 8; optional)
- Area per student (default 2)
- Occupancy limit for the room (default ; optional)

## Results
- Students the room holds
- Capacity by floor space alone
- Floor area
- Usable area
- Usable area per student at capacity

## Formula

```
Usable area = Length × Width − Reserved;  Capacity = min(⌊Usable ÷ Area per student⌋, Occupancy limit)
```

Where:
- Reserved: area that students cannot use
- Area per student: the space allowance you must meet

## Worked example
1. Floor area = 9 × 7 = 63 m².
2. Usable = 63 − 8 = 55 m².
3. 55 ÷ 2 = 27.5, rounded down to 27 students.

**Result:** A 9 × 7 m room with 8 m² reserved holds 27 students at 2 m² each.

## What the result means

Round down, never up: a fractional student means the last one would not get the full allowance. Lab, art and early-years rooms usually need far more space per child than lecture-style rooms.

## Assumptions and limits
- The room is a rectangle; for L-shaped rooms add the areas yourself and enter them as length × 1.
- Space allowances, exits and fire limits are set locally; this tool does not check them.

## Questions

### How much space does each student need?

It depends on age, activity and local rules. Enter the figure from your education authority or building code.

### Should I reserve area for the teacher?

Yes. Teacher desk, board access, storage and walkways are not usable seating space.

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Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/classroom-capacity-calculator