Pyeong converter
Square metres to pyeong and back — and why the exclusive and supply areas of the same flat differ.
One pyeong is exactly 400/121 square metres, about 3.3058 m². The question that never goes away is why 84 m² is advertised as 34 pyeong: 84 is the exclusive area and 34 pyeong is the supply area, so they were never measuring the same thing. Both sit side by side here, with the ratio between them.
Area
What you enter is saved in this browser, so it is still here next time
Around 70–80% for apartments, 50–70% for officetels
Converted
In pyeong
25.41 pyeong
Converted
- In square metres
- 84 m²
- In pyeong
- 25.41 pyeong
Supply area, if that was the exclusive area
- Supply area
- 112 m²
- Advertised size
- 33.9 pyeong
Common sizes — exclusive areas grossed up at the ratio above
| Exclusive m² | Exclusive pyeong | Supply m² | Supply pyeong |
|---|---|---|---|
| 29 | 8.8 | 39 | 11.7 |
| 39 | 11.8 | 52 | 15.7 |
| 49 | 14.8 | 65 | 19.8 |
| 59 | 17.8 | 79 | 23.8 |
| 74 | 22.4 | 99 | 29.8 |
| 84 | 25.4 | 112 | 33.9 |
| 101 | 30.6 | 135 | 40.7 |
| 114 | 34.5 | 152 | 46 |
| 134 | 40.5 | 179 | 54 |
| 165 | 49.9 | 220 | 66.6 |
One pyeong is exactly 400/121 m², about 3.3058 m². Rounding it to 3.3 is already more than 5 m² out at 100 pyeong.
The supply area here is the exclusive area grossed up by the ratio. Real sales material measures the shared area separately, so it can differ by a few square metres. Contracts are always written in square metres.
Make a link with these numbers
Opening the link fills this screen with the same values. Useful for going through it with a partner, or for comparing two sets of conditions.
Divided by 400 over 121
One pyeong is 400/121 m², which as a decimal is 3.30578… m² and never ends. This page divides by the fraction itself, so 84 m² is 84 × 121 ÷ 400 = 25.41 pyeong. The other direction is a multiplication: 32 pyeong is 32 × 400 ÷ 121 = 105.79 m². The estate-agent shortcut "m² × 0.3025" is 121/400 written as a decimal and is exactly the same; "÷ 3.3" gives 25.45 pyeong for 84 m², off by 0.04. Values are shown to two decimal places.
Supply area is exclusive area divided by the ratio
The ratio is the share of the supply area that is exclusive, so an exclusive 84 m² at 75% gives a supply area of 84 ÷ 0.75 = 112 m², or 33.9 pyeong. The same 84 m² at 80% is 105 m² and 31.8 pyeong; at 70% it is 120 m² and 36.3 pyeong. That is how to work back from an advertised "34 pyeong" to the ratio behind it. Entering pyeong converts to m² first and then applies the same formula. A ratio of 0 cannot be divided by, so the supply area shows as "—".
The table lists ten exclusive areas common in sales brochures
29, 39, 49, 59, 74, 84, 101, 114, 134 and 165 m² are recomputed at the same ratio. At 75%, 59 m² is 17.8 pyeong with a supply area of 78.7 m² or 23.8 pyeong — the "24-pyeong type" — and 84 m² is 25.4 pyeong with 33.9 pyeong supply, the "34-pyeong type". 101 m² is 30.6 pyeong exclusive and 40.7 supply. The row within 0.5 m² of your area is highlighted. Changing the ratio moves the whole table, so switching between an apartment (70–80%) and an officetel (50–70%) shows how far the supply area spreads for the same exclusive space.
What it does not do
The ratio is an input, not data about a building — the real figure has to come from dividing the areas in the sales notice or the register, and the default 75% simply sits where apartments commonly are. The contract area (which adds other shared space such as parking) and the extra usable space from a balcony extension are not computed. Pyeong is for picturing a size; the number on paper is m². Enter the m² from the contract or register as it is.
Common questions
QIs 84 m² 25 pyeong or 34 pyeong?
Both. Divided straight out, 84 m² is 25.4 pyeong — that is the exclusive area, the space inside your own front door. The 34 pyeong in the advert is the supply area, which adds the shared stairs and corridors. With a ratio around 75%, an exclusive 84 m² usually means a supply area of 112 m², which is 34 pyeong.
QWhat ratio is normal?
Around 70–80% for apartments and 50–70% for officetels. Officetels come out lower because corridor layouts are common and the shared area is measured under commercial rules. It is why the same nominal size feels much smaller in an officetel.
QCan a contract be written in pyeong?
No. Article 6 of Korea's Act on Measurement bars non-statutory units in trade and certification, so property records and adverts have used square metres since 2007. Pyeong survives as a way of picturing a size; the number on the paperwork is always in square metres.
QHow many pyeong is 59 m²?
An exclusive 59 m² is 17.85 pyeong. At a 75% ratio the supply area is 78.7 m², or 23.8 pyeong, which is why it is commonly called the "24-pyeong type". It is the same logic as 84 m² being the "34-pyeong type": in both cases the advertised figure is the supply area in pyeong, not the exclusive one.
QHow do I convert pyeong to m²?
Switch the unit to pyeong and enter the number. 32 pyeong is 32 × 400 ÷ 121 = 105.79 m²; 25 pyeong is 82.64 m²; 10 pyeong is 33.06 m². With a ratio set, that figure is treated as the exclusive area and the supply area is shown alongside.