Measure
Square Footage Calculator — Room Area & Perimeter
The starting point for almost every other calculation: floor area, perimeter and wall area for one room.
- 01Measure
- 02Adjust
- 03Result
- 04Shop
01 — Measure
Tell us about the job
Before you start — measure this
- Room length
- Room width
- Ceiling height
03 — Result
16.2m²
Floor area
- Perimeter
- 16.2 m
- Wall area
- 43.7 m²
- Room volume
- 43.74 m³
Stored in this browser only. No account needed.
How we got this number
- Length × width
- 4.5 m × 3.6 m
- Floor area
- 16.2 m²
- Perimeter
- 16.2 m
- Wall area
- 43.7 m²
Planning estimate: this calculation helps you estimate material quantities. Actual requirements vary with site conditions, product coverage, installation method and waste. Confirm with the manufacturer or a qualified professional when appropriate.
What to know about this material
- Measure at floor level and at two points — walls are rarely perfectly parallel.
- For an L-shaped room, split it into two rectangles and add the areas together.
- Perimeter is what you need for skirting, coving and trim.
Frequently asked
- How do I convert square metres to square feet?
- Multiply square metres by 10.764. One square foot is 0.0929 square metres.
- How do I measure an L-shaped room?
- Split the plan into two rectangles, calculate each area, then add them. Do the same for perimeter, counting only the outside edges.
- Should I include closets?
- Include them for flooring and paint, exclude them for furniture planning.
Related calculators
What this calculator answers
The highest-intent, lowest-competition searches this page is built to answer outright — every one of them is a quantity question you can settle above without leaving the page.
- How to calculate square footage of a roomKD 29
- Square footage of an l shaped roomKD 10
Questions this page answers
This page is built around one job: measure area and perimeter as the first step before any material maths.
- How to calculate square footage of a room?
- Square footage of an l shaped room?
- How to convert square metres to square feet?
- How to measure a room for flooring?
Also known as: room area calculator, square meter calculator, how to calculate square footage, perimeter calculator.