Pyeong Calculator
Convert ㎡ and 평 instantly, then put exclusive and supply area side by side so a listing’s two pyeong figures do not get mixed up.
- Fewer clicks, keyboard friendly
Convert pyeong and square metres, then compare exclusive and supply area on the same basis.
Values stay in this browserConverted area
Exact factor: 1 pyeong = 400 ÷ 121㎡ = 3.305785…㎡
84㎡ × 121 ÷ 400 = 25.41평
This is an exclusive-area conversion. It describes the space inside the home, not the larger marketed supply-area type.
Compare exclusive and supply area
Enter both figures exactly as the listing states them. This calculator does not estimate one from the other.
The same listing can therefore read 25.41평 exclusive and 33.88평 supply. The difference is shared residential area, not an extra unit conversion.
How to use
- Choose whether the number you have is in square metres or pyeong, then enter the area to see both units immediately.
- Mark the result as exclusive area or supply area so you keep the listing’s area basis visible while converting.
- When a listing gives both figures, enter its exclusive and supply square metres in the comparison fields below.
- Compare like with like: use exclusive-area figures to compare living space, and supply-area figures to compare advertised unit types.
The exact pyeong conversion is 400/121 square metres
One pyeong is exactly 400/121 square metres, which is approximately 3.305785㎡. Convert square metres to pyeong by multiplying by 121/400 (0.3025), and convert pyeong to square metres by multiplying by 400/121. For example, 84㎡ × 121 ÷ 400 = 25.41평; 34평 × 400 ÷ 121 = 112.40㎡. The common mental shortcut of 3.3㎡ per pyeong is close, but the difference grows with larger areas, so this calculator keeps the exact fraction before displaying rounded results.
Exclusive area and supply area are different measurements
Exclusive area (전용면적) is the private area inside a home, such as rooms, living room, kitchen, and bathrooms. Supply area (공급면적) adds the home’s share of residential common space such as corridors, stairs, and elevator halls. Changing 84㎡ to 25.41평 preserves the fact that it is 84㎡ of exclusive area; it does not turn it into the supply-area pyeong type used in an advertisement. The two editable fields in this tool deliberately keep both bases visible rather than estimating one from the other.
Why an 84㎡ home can be described with two pyeong figures
An exclusive area of 84㎡ converts directly to 25.41평. A building may market that home as a larger supply-area type because the supply figure includes shared residential area. The supply area and exclusive-area ratio differ by building, layout, and housing type, so a direct conversion of 84㎡ cannot prove that every home is a particular supply-area type. Enter the supply number printed on the listing or contract, then compare both results on the same screen. For a contract, tax, or eligibility decision, use the registered area and the applicable official documents.
Frequently asked questions
How many pyeong is 84 square metres?
84㎡ is exactly 25.41평 when it is converted directly: 84 × 121 ÷ 400 = 25.41. That result keeps the same area basis, so 84㎡ of exclusive area is 25.41평 of exclusive area rather than a supply-area apartment type.
How many square metres are in one pyeong?
One pyeong is exactly 400/121㎡, approximately 3.305785㎡. The reverse conversion is exactly 121/400평 per square metre, or 0.3025평 per ㎡.
Why does an 84㎡ apartment sometimes get called a 34-pyeong type?
84㎡ is about 25.41평 of exclusive area, while a marketed pyeong type may use the larger supply area that includes shared residential space. The supply figure varies by building, so confirm the separate exclusive and supply figures on the listing instead of converting one number and treating it as the other.
What is the difference between exclusive area and supply area in a Korean apartment listing?
Exclusive area is the private interior space inside the home. Supply area is exclusive area plus the household’s share of common residential spaces such as halls, corridors, and stairs. They must be compared on the same basis because the supply figure is normally larger.
Does this pyeong calculator send a property size to a server?
No. The conversion and exclusive-versus-supply comparison run in the browser. The current values are saved only in that browser so the calculator can restore them, and they are not sent to a server.
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Updated 2026-10-21