Room Area Calculator
Multiply length by width for square metres, then divide by 3.305785 for pyeong. The perimeter is what you need for skirting or moulding.
Your numbers
Area
14.28m²
Pyeong
4.32
Perimeter
15.2m
Formula
Area = Length × Width, Pyeong = Area ÷ 3.305785
Advertised apartment size in Korea includes shared corridors and stairs — this is the actual floor area.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Length (m)The measurement across, side to side. | 4.2 | 0 and up |
| Width (m)The measurement front to back. | 3.4 | 0 and up |
Step by step
Quick reference table
Results when only Length (m) changes and everything else stays put.
| Length (m) | Area (m²) | Pyeong | Perimeter (m) |
|---|---|---|---|
| 2.1 | 7.14 | 2.16 | 11 |
| 3.15 | 10.71 | 3.24 | 13.1 |
| 4.2 | 14.28 | 4.32 | 15.2 |
| 6.3 | 21.42 | 6.48 | 19.4 |
| 8.4 | 28.56 | 8.64 | 23.6 |
What each result means
| Result | At default values |
|---|---|
| Area (m²)The space a shape covers — length squared. | 14.28 |
| PyeongA Korean area unit; 1 pyeong is about 3.3058 m². | 4.32 |
| Perimeter (m)The total length around the outside of a shape. | 15.2 |
Common mistakes
Advertised apartment size in Korea includes shared corridors and stairs — this is the actual floor area.
Glossary
- Length
- The measurement across, side to side.
- Width
- The measurement front to back.
- Area
- The space a shape covers — length squared.
- Pyeong
- A Korean area unit; 1 pyeong is about 3.3058 m².
- Perimeter
- The total length around the outside of a shape.
Frequently asked questions
Q. How is Room Area Calculator calculated?
Area = Length × Width, Pyeong = Area ÷ 3.305785 — Multiply length by width for square metres, then divide by 3.305785 for pyeong. The perimeter is what you need for skirting or moulding.
Q. Can you walk through an example?
With Length 4.2m, Width 3.4m, the answer is Area 14.28m².
Q. What do I need to enter?
Enter Length, Width. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Length (m) moves the answer to Length (m) 2.1 → Area (m²) 7.14 and Length (m) 8.4 → Area (m²) 28.56. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Advertised apartment size in Korea includes shared corridors and stairs — this is the actual floor area.
Related calculators
Keep your length units consistent across inputs — mixing centimetres and metres throws results far off.