Convert Pyeong to Acre
Convert pyeongs to acres instantly. 1 pyeong = 0.000816881 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre 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.
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Pyeong to Acre conversion formula
The relationship between pyeongs and acres:
To convert pyeongs to acres, multiply the value in pyeongs by 0.000816881. To reverse, multiply acres by 1224.1685590175.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Pyeong converter for the reverse direction.
Step-by-step: convert pyeongs to acres
- Write down the value in pyeongs (pyeong).
- Multiply that value by the factor 0.000816881.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 1224.1685590175.
Worked examples
Example 1 — Convert 1 pyeong to ac:
1 × 0.000816881 = 0.000816881 ac
Example 2 — Convert 100 pyeong to ac:
100 × 0.000816881 = 0.081688097 ac
Real-world example — Metric distance scale-up
One thousand pyeongs equals one acre — 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 × 0.000816881 = 0.8168809701 ac
Real-world example — Imperial mile arithmetic
5,280 pyeongs equals exactly one acre. 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 × 0.000816881 = 4.3131315219 ac
Real-world example — Imperial yard-to-mile scale
1,760 pyeongs equals exactly one acre. 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 × 0.000816881 = 1.4377105073 ac
Pyeong to Acre conversion table
Standard reference values for converting pyeongs to acres:
| Pyeong [pyeong] | Acre [ac] |
|---|---|
| 0.01 | 8.16881e-6 |
| 0.1 | 8.16881e-5 |
| 1 | 0.000816881 |
| 2 | 0.0016337619 |
| 3 | 0.0024506429 |
| 4 | 0.0032675239 |
| 5 | 0.0040844049 |
| 10 | 0.0081688097 |
| 20 | 0.0163376194 |
| 30 | 0.0245064291 |
| 40 | 0.0326752388 |
| 50 | 0.0408440485 |
| 100 | 0.081688097 |
| 500 | 0.408440485 |
| 1000 | 0.8168809701 |
Frequently asked questions
How many acres is 1 pyeong?
How do I convert pyeongs to acres?
How do I convert acres back to pyeongs?
How many acres 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 = 0.000816881 ac) 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.