EVERYDAY CLARITY
Floor Area Calculator
How large is my rectangular floor. Enter the quantities below to calculate the result.
Your result
Net floor area
m²
Reference calculation or estimate for example inputs; assumptions and limitations apply.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Floor length (m) | Enter floor length in m; use the same basis as the other measurements. |
| Floor width (m) | Enter floor width in m; use the same basis as the other measurements. |
| Excluded floor area (m²) | Area in square metres. Convert both dimensions consistently before multiplying them. |
Understanding your result
The answer estimates quantity, coverage or cost from the dimensions and allowances you entered. It does not size a structural member, assess capacity or determine installation adequacy.
Common mistakes
- Mixing centimetres with metres, or outside dimensions with the actual filled volume.
- Treating allowance, compaction, supplier yield and density as interchangeable adjustments.
Check your calculation
- Measure independently, subdivide irregular shapes, and compare supplier pack/yield information with the units used here.
Calculation checks, sources and review limits
How large is my rectangular floor?
How large is my rectangular floor. Enter the quantities below to calculate the result.
Common uses
- How large is my rectangular floor
How it works
Multiply length and width and subtract excluded floor area.
Worked example
Enter Floor length: 5 m; Floor width: 4 m; Excluded floor area: 2 m². Results: Net floor area: 18 m².