Area converter
Convert mm², cm², m², hectares, km², square feet, square yards and acres.
What the result means
Area is length squared. A 10 m × 10 m room is 100 m², which is about 1,076 square feet — not 100 square feet.
How it is calculated
to = from × (factorFrom ÷ factorTo), using square metres as the common base
- Value: The amount in the starting unit.
- From / To: Units from the same measurement family.
Each unit is a multiple of a square metre. Convert through m² rather than converting length and forgetting to square the factor.
Assumptions
- Exact international conversion factors, then rounded for display.
- No surveying, temperature expansion or commodity density adjustments.
Worked example
100 m² in square feet
A 100 m² apartment is listed for an overseas buyer who thinks in square feet.
- Factor
- 1 m² = 10.76391 ft²
- Result
- 100 × 10.76391 ≈ 1,076.4 ft²
100 m² is a bit over a thousand square feet, not a small 100 ft² room.
Hectares for farms, square metres for homes
Australian property listings use square metres for houses and apartments, and hectares (10,000 m²) for rural land. Acres still appear in older rural descriptions: one acre is about 4,047 m², or 0.405 ha. A “quarter-acre block” is about 1,012 m², which is why the phrase survives in conversation long after the listings went metric.
Flooring quotes in square metres should not be converted with a 10× rule of thumb. Use the factor 1 m² ≈ 10.764 ft². A 100 m² apartment is about 1,076 ft², not 100 ft² and not 1,000 ft² on the nose.
Land area is not the same as floor area. A two-storey house on a 450 m² lot can have 280 m² of living space. Listings usually say which figure they mean; convert after you know.
Questions
How many m² in a hectare?
Exactly 10,000. A square 100 m on each side.
Is a square the same as 100 ft²?
In some roofing trades a “square” is 100 ft². This converter does not use that trade unit.
How many acres in a hectare?
About 2.471 acres. One acre is about 0.405 ha.
Why isn’t 10 m × 10 m equal to 10 square metres?
Area is length squared. 10 m × 10 m is 100 m². Converting each side to feet and forgetting to square the factor is the usual error.
Related calculators
Sources
National Measurement Institute
Last reviewed 2026-08-19
Bureau International des Poids et Mesures
Last reviewed 2026-08-19
Everyday · Last reviewed 19 August 2026
Estimates only. Not tax, legal or financial advice. Check official sources before relying on a figure.
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Printed from OzCalc (ozcalc.com). Last reviewed 19 August 2026. Estimates only — not tax, legal or financial advice.