Area Unit Converter
Square metres, hectares, mu and square feet — all units at once.
Quick answer
With the default inputs: Value 1 · From unit Square metre · To unit MuConverted value 0.0015 mu
Edit the inputs below to recalculate.Inputs
Result
Converted value
0.0015mu
| Square metre | 1m² |
| Square millimetre | 1000000.00mm² |
| Square centimetre | 10000.00cm² |
| Square kilometre | 0.000001km² |
| Hectare | 0.0001ha |
| Mu | 0.0015mu |
| Square foot | 10.7639ft² |
| Square inch | 1550.00in² |
| Square yard | 1.196yd² |
| Acre | 0.000247ac |
Mu, hectares and acres are still widely used for land transactions; title documents usually state both square metres and mu.
Reverse: known result, work out one input
Enter a target result; the other inputs stay fixed and this one is worked out.
Formula
| Metric | 1 m² = 10 000 cm² = 1 000 000 mm² |
| Land | 1 ha = 10 000 m² = 15 mu, 1 mu = 666.67 m² |
| Imperial | 1 ft² = 144 in² = 0.092903 m², 1 yd² = 9 ft² |
| Acre | 1 acre = 4 840 yd² = 4 046.86 m² ≈ 6.07 mu |
| General rule | target = source value × source factor ÷ target factor |
One mu is 666.6667 m², roughly one and a half basketball courts; one hectare is 15 mu. A 100 m² apartment floor area is about 0.15 mu.
Area and land unit reference
| Unit | Symbol | In m² | In mu | Typical use |
|---|---|---|---|---|
| Square metre | m² | 1 | 0.0015 | Floor area |
| Hectare | ha | 10000 | 15 | Site area |
| Mu | mu | 666.67 | 1 | Farmland, land transfer |
| Square kilometre | km² | 1000000 | 1500 | Regional area |
| Square foot | ft² | 0.0929 | 0.000139 | Imported plant footprint |
| Square yard | yd² | 0.8361 | 0.00125 | Carpet, fabric |
| Acre | acre | 4046.86 | 6.07 | Overseas farms |
How to work it out
- Within metric: 1 m² = 10,000 cm² = 1,000,000 mm², and 1 km² = 1,000,000 m². Area scales as the square of length, so the steps are 100 and a million, not 10 and a thousand.
- For land, anchor on one relationship: 1 hectare = 10,000 m² = 15 mu, so 1 mu = 666.67 m². This is the workhorse conversion for Chinese land and compensation work.
- Imperial: 1 ft² = 144 in² = 0.092903 m², and 1 yd² = 9 ft² = 0.836127 m². Imperial drawings are often in ft², and estate agents quote sq ft.
- Acre: 1 acre = 4840 yd² = 4046.86 m², about 6.07 mu. Overseas farm and plot areas use acres, which do not map directly onto the Chinese mu.
- General form: target = source × source factor ÷ target factor, where each factor is how many square metres one unit represents.
- Check the magnitude: 100 m² is about 1076 ft² and about 0.15 mu. A wrong order of magnitude means a wrong factor.
Where it goes wrong
- Applying the linear step to areas. Since 1 m = 100 cm, people assume 1 m² = 100 cm²; it is 10,000 cm², a hundredfold error.
- Treating the mu as an are. The mu is 666.67 m² and the are is 100 m², a factor of 6.67. Foreign documents saying are do not mean mu.
- Reversing the hectare-to-mu direction. One hectare is 15 mu, so 100 mu is 6.67 hectares, not 1500. In land acquisition that error is enormous.
- Rounding an acre to 4000 m². At 4046.86 m² the error is 47 m² — trivial on a plot, but tens of thousands of square metres across a large farm.
- Mixing construction area with footprint. Construction area is summed floor by floor per GB/T 50353 while footprint is the building base; for one building they can differ tenfold.
Material and cost
An area unit error shifts the answer by one or two orders of magnitude. At 3000 CNY/m², reading 100 m² as 1000 m² mis-states a quote by 2.7 million. In compensation priced by the mu, reversing hectares and mu is a factor of tens.
On site
- Land acquisition, agriculture and forestry use the mu; planning and construction use hectares and square metres; sales use square metres; English-language sources use sq ft and acres. Identify the system before converting.
- Two anchors cover most domestic land work: one mu is about 667 m², and one hectare is 15 mu.
- Drawings distinguish construction area, usable area, net internal area and footprint. These are not convertible — each is calculated separately.
- In fit-out quotes, developed area versus plan area makes a big difference, especially for cabinetry. Confirming which basis applies matters more than converting units.
Basis
- GB/T 50353-2013 Standard measurement for construction area of building
- GB/T 3100-3102 Quantities and units series
- GB 50854-2013 Standard method of measurement for building and decorative works
FAQ
Why is one mu such an odd 666.67 square metres?
Because mu comes from the Chinese system where the chi is 1/3 m. One mu is 60 square zhang = 6000 square chi, and one square chi is 1/9 m², so 1 mu = 6000 ÷ 9 = 666.67 m². Remember just two numbers on site: 1 mu ≈ 667 m², 1 hectare = 15 mu.
How do gross, internal and usable floor area differ?
Gross floor area is measured to the outside face of the external walls and includes walls and shared circulation; internal area is what the party walls enclose within your door; usable area subtracts the walls themselves. There is no fixed ratio — the gap between them runs 15-25% between units in the same building, so multiplying by 0.8 is not valid.
Can roof area be taken from floor area?
No. Flat roofs still add eaves, parapet inner faces and falls; pitched roofs must be increased by the slope factor — 1/cos30° = 1.155 at 30°, so projected area times 1.155. With dormers and rooflights the true developed area often exceeds the projection by over 20%.
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Area Unit Converter. 2026-10-25. https://jianzhujisuan.com/en/unit-area
Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.