Floor area converter
Convert a floor area between square metres, square feet and pyeong — useful when property listings use a unit you do not think in.
Your numbers
The figure you want to convert.
Input unit
Applies the ratio to give usable area.
Result
Enter your numbers and the result appears here.
How this is calculated
- One pyeong is exactly 400/121 m², about 3.305785 m².
- Square feet convert at 1 sq ft = 0.09290304 m².
- Entering a usable-area ratio applies it to the figure, mirroring how listings quote gross versus usable floor area.
- The side length of an equivalent square is shown as well, which makes an unfamiliar number easier to picture.
Formula
- Pyeong to m²
m² = pyeong x 3.305785- m² to pyeong
pyeong = m² / 3.305785- Usable area
usable = gross area x usable ratio
Worked example
A Korean listing advertises a 34 pyeong apartment with 84 m² of usable space.
- 34 pyeong x 3.305785 = about 112 m² gross
- 84 / 3.305785 = about 25.4 pyeong usable
- Usable ratio: 84 / 112 = 75%
The headline "34 pyeong" is the gross area; the space inside the front door is 84 m², or about 25.4 pyeong. Always check which figure a listing quotes.
Things to watch for
- Korean listings usually advertise gross area (usable plus shared corridors and stairs); contracts state the usable area.
- Japanese listings use tsubo, which is the same size as a pyeong.
- Pyeong is not an official metric unit — legal documents use square metres.
- Compare properties on usable area, not the headline figure.
Frequently asked questions
How big is one pyeong?
About 3.31 m², or roughly 35.6 sq ft. It comes from a square of six Korean feet on each side, and the exact value is 400/121 m².
Why do listings show two different sizes?
One is gross area including shared space such as corridors and stairwells; the other is the usable area inside your own front door. The ratio between them is typically 70-80% for apartments.
Is tsubo the same as pyeong?
Yes. Japan uses tsubo and Korea uses pyeong for the same unit, about 3.31 m².
How do I picture a size quickly?
Look at the equivalent square side length. 100 m² is a 10 m by 10 m square, which is easier to imagine than the number alone.
Last reviewed: August 25, 2026
Results are for guidance only. Actual bills, taxes and pay depend on your contract and the official rules that apply to you.