Area converter — square metres, square feet, acres and hectares

Land is sold in acres in one country and hectares in the next, while flats are listed in square metres or square feet depending on the site. Thirteen area units, one running total.

How to use it

1
Type into any row — say m² or ft². The results appear immediately, no button needed.
2
Need a combined figure? Fill in two rows, for example m² and ha, and they are added together before converting.
3
Set how many digits you want (4–12) and click a result to copy the plain number.

Exact conversion factors

These are the definitions the calculator uses. Nothing here is rounded for convenience — where a value is exact by definition, it says so.

1 ft² = 0.09290304 m² exactly · 1 m² = 10.7639104 ft²
1 acre = 4046.8564224 m² = 43 560 ft² = 0.404685642 ha
1 ha = 10 000 m² = 2.47105381 acres
1 mi² = 2.58998811 km² = 640 acres

Formulam² = ft² × 0.09290304 · ft² = m² × 10.7639104 · ha = m² ÷ 10 000 · ac = m² ÷ 4046.8564224

Area conversion table — every unit

One of each unit, converted into the three units people ask for most.

Unit	m²	ft²	ha
1 km²	1 000 000 m²	10 763 900 ft²	100 ha
1 ha	10 000 m²	107 639 ft²	1 ha
1 a	100 m²	1 076.39 ft²	0.01 ha
1 m²	1 m²	10.7639 ft²	0.0001 ha
1 dm²	0.01 m²	0.107639 ft²	0.000001 ha
1 cm²	0.0001 m²	0.00107639 ft²	0.00000001 ha
1 mm²	0.000001 m²	0.0000107639 ft²	1.00000×10^-10 ha
1 µm²	1.00000×10^-12 m²	1.07639×10^-11 ft²	1.00000×10^-16 ha
1 mi²	2 589 990 m²	27 878 400 ft²	258.999 ha
1 ac	4 046.86 m²	43 560 ft²	0.404686 ha
1 yd²	0.836127 m²	9 ft²	0.0000836127 ha
1 ft²	0.092903 m²	1 ft²	0.0000092903 ha
1 in²	0.00064516 m²	0.00694444 ft²	0.000000064516 ha

m² → ft², ha — quick values

m²	ft²	ha
0.5 m²	5.38196 ft²	0.00005 ha
1 m²	10.7639 ft²	0.0001 ha
2 m²	21.5278 ft²	0.0002 ha
3 m²	32.2917 ft²	0.0003 ha
5 m²	53.8196 ft²	0.0005 ha
10 m²	107.639 ft²	0.001 ha
20 m²	215.278 ft²	0.002 ha
25 m²	269.098 ft²	0.0025 ha
50 m²	538.196 ft²	0.005 ha
100 m²	1 076.39 ft²	0.01 ha
250 m²	2 690.98 ft²	0.025 ha
1 000 m²	10 763.9 ft²	0.1 ha

How this converter works

Area units grow fast. A square kilometre is a million square metres, and a square mile is 640 acres — errors of a factor of ten are easy to make and expensive to discover later. Seeing every unit at once makes a wrong order of magnitude obvious immediately.

The hectare is not an SI unit but it survives everywhere in farming and planning: 10 000 m², or a square 100 m on a side. The acre has a stranger history — one chain by one furlong, the strip a team of oxen could plough in a day — which is why it lands on 4046.86 m² instead of a round number.

Notes and abbreviations

ha — hectare, 10 000 m²; a — are, 100 m²
ac — acre, 1/640 of a square mile, 4046.8564224 m²
A football pitch is roughly 0.7 ha; a UK allotment plot is about 250 m²

Questions

How many square feet are in a square metre?

10.7639104 ft². The factor is the length factor squared: 3.28084² = 10.7639.

How big is one acre?

4046.8564224 m², 0.404685642 ha, or 43 560 ft². Roughly a square 63.6 m on each side.

Does the converter handle plot sizes given in both units?

Yes. Type 2 in the hectare row and 3 in the acre row and the total appears in every other unit at once.