Pyeong Calculator
Convert pyeong to square metres and back (1 pyeong = 400/121 m²), with one-tap chips for common apartment sizes.
How to use
- Pick a direction at the top: ‘Pyeong → m²’ or ‘m² → Pyeong’.
- Type the area and the value in the other unit appears instantly. Decimals are fine.
- Tap 18 / 24 / 32 / 34 / 45 pyeong or 59 / 74 / 84 m² to switch to that unit and convert a common Korean apartment size in one step.
- Copy result puts the conversion and the 1 pyeong = 400/121 m² factor on your clipboard.
FAQ
How big is one pyeong?
Exactly 400/121 m², which is about 3.3058 m² (3.305785). One square metre is 121/400 of a pyeong, or 0.3025 pyeong.
How many square metres is 34 pyeong?
34 × 400/121 = 112.397 m². In the same way 18 pyeong is 59.504 m², 24 pyeong is 79.339 m², 32 pyeong is 105.785 m² and 45 pyeong is 148.760 m².
How many pyeong is 84 m²?
84 × 121/400 = 25.41 pyeong. 59 m² is 17.85 pyeong and 74 m² is 22.39 pyeong. The ‘34-pyeong type’ in apartment sales is based on supply area, which adds shared space to the 84 m² exclusive area.
Why 400/121 and not 3.3?
One pyeong is 6 cheok by 6 cheok and one cheok is 10/33 m, so (6 × 10/33)² = 400/121 m². 3.3 m² is only an approximation, so 10 pyeong is 33.058 m², not 33 m².
Which area do apartment pyeong figures use?
Headline figures such as the 34-pyeong type are usually based on supply area (exclusive area plus shared residential space). The exclusive area of the same home, 84 m², is 25.41 pyeong, so check both areas in the contract.
Should I use m² or pyeong?
The legal unit of area in Korea is the square metre. Pyeong has not been allowed in contracts or advertising since 1 July 2007, and property registers and building ledgers use m², so treat pyeong as a reference figure only.