Area Converter

Convert area between square millimetres, centimetres, metres, hectares, square kilometres, square inches, square feet, square yards, acres, and square miles, with all equivalents shown at once.

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Area

Convert area between metric and imperial units

Enter an area value and choose a unit — all ten area units are shown at once: square millimetres, centimetres, metres, hectares, square kilometres, square inches, square feet, square yards, acres, and square miles.

Value From unit

Metric

Square millimetres 1,000,000 mm²

Square centimetres 10,000 cm²

Square metres 1 m²

Hectares 0.0001 ha

Square kilometres 1e-6 km²

Imperial

Square inches 1,550 in²

Square feet 10.7639 ft²

Square yards 1.196 yd²

Acres 0.0002 ac

Square miles 3.861e-7 mi²

Quick reference

1 ft² = 144 in² = 0.0929 m²
1 yd² = 9 ft² = 0.836 m²
1 acre = 43,560 ft² = 0.405 ha
1 hectare = 10,000 m² = 2.471 acres
1 km² = 100 ha = 0.386 mi²
1 mi² = 640 acres = 2.59 km²

Area

Area conversion: square metres, acres, hectares, and all the rest explained

An area converter translates any area measurement into all common units simultaneously — square millimetres through square miles. This tool covers both metric and imperial area units: mm², cm², m², hectares, km², in², ft², yd², acres, and mi².

Metric and imperial area units compared

Metric area units scale in powers of ten just like length units, but because area is two-dimensional the scale factors are powers of 100 (10²) rather than 10. One square metre equals 10,000 square centimetres (100 × 100). One hectare equals 10,000 square metres. One square kilometre equals 100 hectares or 1,000,000 square metres.

Imperial area units have less regular relationships. 1 ft² = 144 in² (12 × 12). 1 yd² = 9 ft² (3 × 3). 1 acre = 43,560 ft² (an acre is defined as 10 square chains, or 66 ft × 660 ft). 1 mi² = 640 acres (1,760 yd × 1,760 yd).

Hectares and acres: the land area standards

For land area, hectares and acres are the dominant units. One hectare (ha) equals 10,000 m² and is approximately 2.471 acres. One acre equals 4,046.856 m² and is approximately 0.405 ha. The hectare is used internationally in agriculture, planning, and property; the acre is standard in the US and UK.

One square kilometre equals 100 hectares or approximately 247 acres. One square mile equals 640 acres or approximately 259 hectares (2.59 km²). These are the most-needed conversions for anyone reading land registries, planning documents, or agricultural data across different countries.

Square feet and square metres in everyday use

Floor area in buildings is measured in square feet in the US and in square metres (m²) in most other countries. One square metre equals approximately 10.764 ft². A 1,000 ft² apartment is roughly 93 m²; a 100 m² apartment is roughly 1,076 ft². This is the most common conversion needed when comparing property listings across countries.

Room area for flooring and paint calculations is often in ft² (US) or m² (UK/Europe). Tiles and flooring are sold in m² internationally and in ft² or yd² in the US. This converter shows all units from the same input.

Using this converter for property, maps, and science

Property and real estate: enter the stated floor area in ft² or m² to get the equivalent in the other unit. Land area: enter acres or hectares for all equivalents. Geographic maps: enter km² to see the mi² equivalent or vice versa. Agricultural and scientific contexts typically use ha or km²; historical UK documents may use acres.

Note that area units scale as the square of length units. A room that is 5 m × 4 m = 20 m². Converting those lengths to feet (5 m ≈ 16.4 ft, 4 m ≈ 13.12 ft) gives 16.4 × 13.12 ≈ 215 ft² — which matches 20 m² × 10.764 ≈ 215 ft². Always convert the area directly rather than converting each dimension and then multiplying, to avoid compounding rounding errors.

Frequently asked questions

How many square feet are in a square metre?

One square metre equals approximately 10.7639 square feet. Equivalently, one square foot equals approximately 0.0929 m². The exact value is 1 m² = (1 / 0.09290304) ft², since 1 ft = 0.3048 m exactly and 1 ft² = 0.3048² m².

How many acres in a hectare?

One hectare equals approximately 2.4711 acres. One acre equals approximately 0.4047 hectares. Both are used for land area: hectares in metric countries and in international agriculture; acres in the US and UK.

What is the difference between a square kilometre and a hectare?

One square kilometre (km²) = 100 hectares (ha). A hectare is therefore one hundredth of a square kilometre. In terms of scale: 1 ha ≈ a standard city block or a medium-sized farm field; 1 km² ≈ a small town or suburb.

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