Convert Pyeong to Chō
Convert pyeongs to chōs instantly. 1 pyeong = 0.0003333347 chō — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Chō to Pyeong converter for the reverse conversion.
Units explained
Pyeong
A pyeong is a Korean unit of area equal to approximately 3.3058 m² (about 35.58 square feet).
Originated as a traditional East Asian land unit. Korean usage standardizes pyeong at 400/121 m² ≈ 3.3058 m². Defined as the area of a 6-by-6 Korean foot (cheok) square.
Pyeong is the primary unit for residential real estate in South Korea. Although the government tried to phase pyeong out in favor of square meters from 2007, the unit remains in widespread popular use, particularly for apartment sizes.
Traditional East Asian unit; remains in widespread Korean use despite government metric campaigns.
Chō
A chō is a Japanese unit of large-scale area equal to approximately 9917.36 m² (about 0.991 hectare or 2.45 acres). It equals 3,000 tsubo.
Traditional Japanese land area unit, used historically for rice paddies and large estates.
Chōs appear in Japanese agricultural records and historical land documents. Modern usage favors hectares for new transactions but legacy records remain.
Traditional Japanese unit; standardized via the tsubo definition.
Pyeong to Chō conversion formula
The relationship between pyeongs and chōs:
To convert pyeongs to chōs, multiply the value in pyeongs by 0.0003333347. To reverse, multiply chōs by 2999.9879000545.
How to use this converter
Type a value into the calculator. The result in chōs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Chō to Pyeong converter for the reverse direction.
Step-by-step: convert pyeongs to chōs
- Write down the value in pyeongs (pyeong).
- Multiply that value by the factor 0.0003333347.
- The product is the equivalent value in chōs (chō).
- To reverse, multiply the chō value by 2999.9879000545.
Worked examples
Example 1 — Convert 1 pyeong to chō:
1 × 0.0003333347 = 0.0003333347 chō
Example 2 — Convert 100 pyeong to chō:
100 × 0.0003333347 = 0.0333334678 chō
Real-world example — Imperial yard-to-mile scale
1,760 pyeongs equals exactly one chō. American athletes and surveyors use this conversion to translate distances quoted in the smaller imperial unit into recognizable fractions of the larger geographic one.
1760 pyeong × 0.0003333347 = 0.5866690329 chō
Real-world example — Metric distance scale-up
One thousand pyeongs equals one chō — the running distance for a 1K race or the standard metric kilometre-scale step. The simple thousand-fold conversion is the most-used metric distance translation.
1000 pyeong × 0.0003333347 = 0.3333346778 chō
Real-world example — Imperial mile arithmetic
5,280 pyeongs equals exactly one chō. American hikers tracking elevation gain in the smaller unit but trail length in the larger one use this constant every time they read a topographic map.
5280 pyeong × 0.0003333347 = 1.7600070987 chō
Pyeong to Chō conversion table
Standard reference values for converting pyeongs to chōs:
| Pyeong [pyeong] | Chō [chō] |
|---|---|
| 0.01 | 3.333347e-6 |
| 0.1 | 3.333347e-5 |
| 1 | 0.0003333347 |
| 2 | 0.0006666694 |
| 3 | 0.001000004 |
| 4 | 0.0013333387 |
| 5 | 0.0016666734 |
| 10 | 0.0033333468 |
| 20 | 0.0066666936 |
| 30 | 0.0100000403 |
| 40 | 0.0133333871 |
| 50 | 0.0166667339 |
| 100 | 0.0333334678 |
| 500 | 0.1666673389 |
| 1000 | 0.3333346778 |
Frequently asked questions
How many chōs is 1 pyeong?
How do I convert pyeongs to chōs?
How do I convert chōs back to pyeongs?
How many chōs is 100 pyeongs?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 pyeong = 0.0003333347 chō) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.