KEMI Tools

Pyeong ↔ m² Area Converter

Type in either pyeong or square metres and the other updates instantly, with ft², acres and hectares alongside. From an apartment’s exclusive area you can estimate common, supply and contract area and the marketed ‘pyeong type’, plus usable area including the balcony. Uses the exact definition 1 pyeong = 400/121 m².

Pyeong ↔ m²

Square metres㎡Pyeongpy

1 pyeong = 400/121 m² ≈ 3.305785 m² · 1 m² = 0.3025 pyeong

m² · pyeong · ft² · acre · ha

Square metres (m²)92.9

Pyeong28.1

Square feet (ft²)1,000

Acres0.023

Hectares (ha)0.0093

Apartment: exclusive / supply / contract area

Exclusive area (m²)㎡e.g. 84.97 for an ‘84 type’

Common area input

Exclusive ratio%Apartments ~74–80%Other common area (optional)㎡Parking, management office — contract area onlyBalcony / service area (optional)㎡Usable but not counted in any official area

Exclusive84.97㎡ · 25.7 py

+ Residential common28.32㎡ · 8.57 py

= Supply area (the ‘pyeong-type’ basis)113.29㎡ · 34.27 py

Exclusive ratio75%

Marketed as a “34-pyeong” unit (supply basis); the actual interior (exclusive) is 25.7 pyeong.

Quick table (ratio 75%)

Type (excl. m²)	Excl. py	Supply m²	Py-type
39	11.8	52	~16
49	14.8	65.3	~20
59	17.8	78.7	~24
74	22.4	98.7	~30
84	25.4	112	~34
101	30.6	134.7	~41
114	34.5	152	~46
135	40.8	180	~54

Supply area varies by complex; check the official sales notice or building register.

How to use

Type into either the m² or pyeong box; the other updates.
Use the second card for ft², acres or hectares.
For apartments, enter the exclusive area and either the common area or an exclusive ratio (~75%).
Add other common area and balcony to see contract and usable area.

Definition

Why 1 pyeong = 400/121 m²

A pyeong is a square 6 ja on each side. With 1 ja defined as 10/33 m, one pyeong is (60/33 m)² = 400/121 m² ≈ 3.305785 m², and 1 m² = 0.3025 pyeong. Dividing by 3.3 is only an approximation.

pyeong → m²: × 400/121    m² → pyeong: × 0.3025
Exclusive 84.97 m² + residential common 27.40 m² = supply 112.37 m² ≈ 34 pyeong
Exclusive ratio 75.6% · contract area adds parking/office · balcony is excluded

Korean listings quote several areas: exclusive (inside your door), supply (exclusive + shared stairs and corridors — the basis of the ‘34-pyeong’ label), contract (supply + parking and other shared space, common for officetels and shops) and service area (balconies, never counted). Always compare exclusive m² across property types. Since July 2007 the Measures Act requires m² rather than pyeong in contracts and advertising.

FAQ

How big is one pyeong exactly?

A square of 6 ja per side with 1 ja = 10/33 m, so exactly 400/121 m² ≈ 3.305785 m². Dividing by 3.3 slightly overstates pyeong; multiply m² by 0.3025 instead.

Is a ‘34-pyeong’ flat the same as ‘84 m²’?

Usually yes: 84 m² is the exclusive (interior) area, while 34 pyeong is the supply area (exclusive + shared stairs/corridors ≈ 112 m²) expressed in pyeong.

Where does the balcony go?

Balconies are ‘service area’ and are excluded from every official area figure, which is why extended-balcony flats feel bigger than their exclusive area.

Can pyeong be used in ads?

No. Korea’s Measures Act (Art. 6) bans non-legal units such as pyeong in trade and advertising; since July 2007 contracts and ads use m².