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Area Converter

Convert between Chinese land units (1 mu = 666.67 m²), metric hectares/km² and imperial acres/square feet with exact factors.

Land is measured in mu, apartments in square metres, property listings in square feet, agricultural subsidies in hectares — area straddles the metric system, imperial units and East Asian land units at once. This tool converts between mu, fen, qing, square metres, hectares, square kilometres, square feet and acres; the anchors are 1 mu = 666.67 m² and 1 hectare = 15 mu = 10000 m².

On conventions: in the traditional system 1 mu is 10 fen and 1 qing is 100 mu, and the mu-to-hectare conversion is not a whole number, so land contracts and statistical tables have to be read carefully for which system they use. Formal land-agency documents use hectares while everyday speech uses mu, so when both appear, convert them to one system before doing any arithmetic.

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How to use

  1. Enter the area in the unit you have.
  2. Read the value in every other unit.
  3. Check whether a document is using metric or traditional land units.
  4. Convert both to one system before comparing or calculating.

How it works

Chinese market area units (mu, fen)

Chinese market basis: 1 mu = 2000/3, about 666.67 square meters; 1 fen = 1/10 mu, about 66.67 sq m; 1 qing = 100 mu, about 66666.7 sq m.

Metric area units

Metric: 1 hectare = 15 mu = 10000 sq m; 1 square kilometer = 100 hectares = 1500 mu.

Imperial area units

Imperial: 1 acre is about 4046.86 sq m, about 6.07 mu; 1 square foot is about 0.0929 sq m.

Code example

JavaScript Square metres as the hub 

const M2 = { mu: 666.6667, fen: 66.66667, qing: 66666.67,
             m2: 1, ha: 10000, km2: 1e6, ft2: 0.09290304, acre: 4046.8564224 };

const convert = (v, from, to) => v * M2[from] / M2[to];

convert(1, "mu", "m2");     // 666.6667
convert(1, "ha", "mu");     // 15.0000
convert(1, "acre", "m2");   // 4046.8564

Python The same coefficient table in Python 

M2 = {"mu": 666.6667, "m2": 1, "ha": 10000,
      "ft2": 0.09290304, "acre": 4046.8564224}

convert = lambda v, f, t: v * M2[f] / M2[t]

convert(100, "m2", "mu")   # 0.15 mu
convert(3, "mu", "ha")      # 0.2 ha

FAQ

How big is one mu exactly?

1 mu = 666.67 sq m, roughly a 25.8 m x 25.8 m square, or a 100 m by 6.67 m strip. A mnemonic: "add half, shift three left" — add half the square-meter figure and move the decimal three places left to get mu.

How do hectares and mu convert?

1 hectare = 15 mu, so 100 mu is about 6.67 hectares. Rural land certificates use mu; planning documents use hectares.

What is a fen?

1 fen = 0.1 mu, about 66.67 sq m, common for rural homesteads and small plots. For example 3 fen is about 200 sq m.

How do mu and square meters convert?

1 mu is about 666.67 sq m, and 1 sq m = 0.0015 mu. For a quick estimate divide square meters by 667; one mu is roughly a square about 25.82 m per side.

Is there a reliable mental shortcut between square meters and mu?

Old mnemonics get muddled; safer to remember two constants: 1 mu is about 666.7 sq m, 1 sq m = 0.0015 mu. Estimate with "square meters / 667" — within 1% error, fine for judging land size.

How much do acre, mu and hectare differ?

1 acre is about 4046.86 sq m, about 6.07 mu, about 0.405 hectare. An acre is smaller than a hectare but far larger than a mu — watch for this when reading overseas farm or property material; don't treat acre as mu.

Does the gross-vs-net floor area issue relate to unit conversion?

No — that's about measuring conventions, not units. Gross floor area includes shared space (elevators, corridors, exterior walls); net floor area covers only usable interior space, and their ratio is the efficiency rate. Both are in square meters, unrelated to mu or hectare conversion.