How do I convert acres to square metres?

Multiply by 4,046.8564224. So 100 acres × 4,046.8564224 = 404,685.64224 square metres. Because a square metre is the smaller unit, the number always gets larger — a useful check that you have not divided where you should have multiplied.

What is 1,000 acres in square metres?

1,000 acres is 4,046,856.4224 square metres. The full sequence for round numbers: 1 acre = 4,046.8564224 square metres, 10 acres = 40,468.564224 square metres, 100 acres = 404,685.64224 square metres, 1,000 acres = 4,046,856.4224 square metres. The relationship is strictly linear, so any value can be scaled from any other.

Is there a quick way to estimate acres to square metres mentally?

Treat an acre as 4,000 square metres instead of the exact 4,046.8564224. That is out by about 1.2%, which is fine for judging whether something fits and not fine for cutting it. Anything that will be built to should use the exact figure — and there is no reason not to, since it is exact rather than an approximation of something messier.

What land units are used in India?

Several, and they vary by state, which is why conversion matters there more than almost anywhere. The bigha ranges from about 1,500 to 2,500 square metres depending on the region; the cent is 1/100 of an acre, or 40.47 square metres, and is common in the south; the guntha is 101.17 square metres, or 1/40 of an acre, and is used in Maharashtra and Karnataka. Land records may use any of them alongside acres and hectares, and the local value has to be established before any conversion is meaningful.

How big is a square kilometre in familiar terms?

A hundred hectares, a million square metres, or about 247 acres. It is a square a kilometre on each side, which is roughly a twelve-minute walk along one edge. Central Park in New York is about 3.4 square kilometres; the City of London is 2.9; Monaco is about 2. For anyone used to acres, a square kilometre is a shade under 250 of them, which makes the rough conversion easy: multiply square kilometres by 250 and subtract a percent.

How many decimal places should I keep?

As many as the measurement justifies and no more. Area is measured less precisely than length in practice, because it is usually derived from two measurements each with their own error — and those errors compound. A room measured to the nearest centimetre in both directions gives an area good to a few hundredths of a square metre at best, so quoting it to five decimal places implies an accuracy that the tape never had. Match the significant figures of the least precise input.

What is a "square" in construction?

A hundred square feet, and it is standard in North American roofing. A roof described as thirty squares is 3,000 square feet, or about 279 square metres. Roofing materials are sold and priced by the square, and bundles of shingles are typically a third of one — so three bundles cover a square. The unit exists because a hundred square feet is a convenient bundle-sized quantity, and it has no metric equivalent, so anyone working across the boundary converts to square metres and back.

What is a rood, a perch and a chain?

Older English land units that survive in deeds and historic records. A rood is a quarter of an acre, 1,210 square yards. A perch, also called a rod or a pole, is a linear unit of 5.5 yards, and a square perch is 30.25 square yards — forty of them make a rood. A chain is 22 yards, being four perches, and an acre is one chain by one furlong. Old conveyances often give areas as so many acres, roods and perches, which reads like a mixed-base number and is one: 4 roods to the acre, 40 perches to the rood.

Acres to Square Metres Converter

Acres to square metres is the conversion between how land is advertised and how it is registered. Property listings across the English-speaking world use acres; land registries in most of those same countries record square metres or hectares. Anyone checking a listing against a title does this conversion. There are ex…

VALUE & FROM

4,046.8564

1 acre = 4,046.8564 square meter · 1 acre = 4,046.8564 square meter

1 acre IN EVERY UNIT

METRIC (SI)

METRIC LAND

IMPERIAL / US

SOUTH ASIAN LAND

EAST ASIAN LAND

CONSTRUCTION

SCIENTIFIC

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HOW TO USE

1
Type the number of acres into the value box. The converter opens with acres and square metres already selected, so the answer appears as you type.
2
Read the result in square metres. The conversion is a multiplication by 4,046.8564224, applied at full precision — the displayed rounding is for readability only.
3
Use the search box to switch either unit if you need a different pair. The same converter handles every length unit from the Planck length to the megaparsec.
4
Check the direction as a sanity test: converting to square metres must make the number larger, because a square metre is the smaller unit.

QUICK REFERENCE

1 m²

10.7639 ft²

1 ft²

0.092903 m²

1 acre

4,046.86 m²

1 hectare

2.47105 acres

1 acre

43,560 ft²

1 hectare

10,000 m²

1 sq mile

640 acres

1 km²

0.386102 mi²

1 yd²

9 ft²

1 m²

1,550 in²

ABOUT AREA UNITS

Area is measured against the square metre, the SI derived unit. Because area is length squared, each metric step is a hundredfold jump, not tenfold: a square metre is 10,000 square centimetres and 1,000,000 square millimetres. The everyday imperial units follow the same rule — a square yard is 9 square feet, and an acre is 43,560 square feet — while land is measured in acres, hectares (10,000 m²), ares and dunams. Traditional South Asian units are widely used for property: a guntha is 1⁄40 of an acre, a cent is 1⁄100 of an acre, and the bigha, katha, marla and kanal are common across India and Pakistan — though several of these vary by region, so this tool uses the most common standard values. East Asian units like the Japanese tsubo, the Korean pyeong and the Thai rai are included too, alongside the scientific barn (10⁻²⁸ m²) used for nuclear cross-sections. Every unit is stored as its exact number of square metres, so any conversion is just the input turned into square metres and then into the target unit.

FREQUENTLY ASKED QUESTIONS

One acre is 4,046.8564224 square metres. Put the other way round, there are 0.00024710538 acres in a square metre. That figure is exact rather than approximate. Area factors are the square of the linear ones, and the linear ones were fixed exactly by the 1959 International Yard and Pound Agreement — the inch at 25.4 mm, so the square inch at exactly 0.00064516 m².

1 acre = 4,046.8564224 square metres
1 square metre = 0.00024710538 acres
Exact by definition, not a measurement
10 acres = 40,468.564224 square metres

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Last updated: — · 42 area units · Exact SI & imperial definitions · Verified by the EagleCalculator team · Eagle-eyed accuracy for every calculation.