Unit Converters

Area & Pyeong Converter

Convert between square meters and pyeong.

Value

From unit

To unit

Converted value

3.3058㎡

Reference rate1 평 = 3.3058 ㎡

Pyeong and square meters

Pyeong is a traditional Korean/Japanese area unit; 1 pyeong equals 3.305785 m², and 1 m² equals about 0.3025 pyeong. This tool also supports km², hectares (ha), ares (a), square feet (ft²), square yards (yd²), and jeongbo.

How to use it

Enter a value, choose the from and to units, and the result updates automatically. Use Swap units to flip the two selections.

Result = value × (from-unit m²) ÷ (to-unit m²)

Common conversions: 1 pyeong = 3.306 m², 84 m² ≈ 25.4 pyeong, 1 ha = 10,000 m².

Notes

For reference only: conversion factors follow standard/commonly used values; rounding may cause tiny differences from exact values.

Why 3.305785 m²? — Origins in the old East Asian unit system

Pyeong's oddly precise factor of 400/121 m² (≈3.305785 m²) traces back to the traditional East Asian cheok-gwan unit system. One pyeong was defined as the area of a square with sides of 6 cheok, and in Korea/Japan, 1 cheok equals 10/33 m (about 30.303 cm). Six cheok is therefore 20/11 m, and squaring that gives exactly 400/121 m² — matching this calculator's factor precisely.

In everyday use, people often approximate with ×3.3 instead of the exact 400/121. Checking the error: for 10 pyeong, the exact value is 33.0579 m² versus 33.0000 m² approximated, a difference of about 0.175% — the same ratio holds at any scale, so ×3.3 is a fine mental shortcut, but exact contracts or registrations should use the precise factor.

Since 2007, Korea's official legal unit of area has been the square meter, and pyeong is technically not allowed on property registries or contracts. Even so, pyeong remains widely used in everyday real-estate conversation — a common case of a legal unit and a customary unit coexisting.

FAQ

How many square meters is 1 pyeong?

1 pyeong is 3.305785 m², and 1 m² is about 0.3025 pyeong. Apartment listings use square meters, so this factor converts between the two.

How many pyeong is an 84 m² apartment?

84 m² is about 25.4 pyeong. This is the common "national size" unit (exclusive area); based on the supply area (exclusive + common), it's often listed as roughly 33-34 pyeong.

How many square meters are a hectare and an are?

1 are (a) is 100 m², and 1 hectare (ha) is 10,000 m² (100 a). These units are mainly used for farmland and forest land.

Where does the 3.305785 m² factor for 1 pyeong come from?

In the traditional cheok-gwan system, 1 pyeong was defined as the area of a square with 6-cheok sides, where 1 cheok = 10/33 m. Squaring 6 cheok (20/11 m) gives 400/121 m² (≈3.305785 m²), matching this calculator's factor exactly.

Is it fine to mentally approximate pyeong to m² using ×3.3?

For a rough sense, yes. For example, 10 pyeong is exactly 33.0579 m², versus 33.0000 m² approximated — about a 0.175% difference. For contracts or registrations that need exact figures, use the precise factor (400/121) as this calculator does.

FAQ

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