Room Area Calculator
Calculate a room's floor area and perimeter from its length and width, in meters.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter a room's length and width in meters to find its floor area and perimeter.
Your result
20
Floor area
Perimeter18
AI explanation
Formula
Area = length × width; perimeter = 2 × (length + width)Worked example
5m × 4m room
| Field | Value |
|---|---|
| Room length (m) | 5 |
| Room width (m) | 4 |
| Floor area | 20 |
| Perimeter | 18 |
Assumptions
- Assumes a simple rectangular room — for an L-shaped or irregular room, split it into rectangular sections and calculate each separately.
Frequently asked questions
How do I calculate an L-shaped room?
Split it into two (or more) rectangular sections, calculate each area separately with this calculator, and add the results together.
What is the perimeter useful for?
Perimeter is useful for estimating skirting board, cornice, or wall-base trim length needed around the room.
Is there a version of this in square feet?
Yes — see the Square Footage Calculator for the same calculation with feet-based inputs and a square-feet result.