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Area Converter Calculator

One acre converts to 43,560 square feet or 4046.8564224 square meters under the international-foot definition. A 100-meter by 100-meter square covers one hectare: 10,000 square meters, about 2.47105 acres. When converting a 10-foot by 10-foot floor, convert its 100 square feet using the squared length factor; multiplying only by 0.3048 confuses area with length.

Area Converter Calculator: inputs

Calculated result
Converted value43,560
1 unit of "from" in "to" units43,560

Area Converter Calculator: Area to convert sensitivity

Area Converter Calculator: Area to convert and Converted value5 calculations vary the “Area to convert” input while holding the other entered inputs constant.0.834,8480.939,204143,5601.147,9161.252,272

Enter an already measured area and select the starting and requested area units. The converter does not infer a lot’s boundary from its street address or survey. One hectare is 10,000 square meters.

Historical survey-foot records and international-foot measurements use different length conventions.

Area Converter: worked example

Area to convert1
Starting unitAcres
Requested unitSquare feet
Converted value43,560
1 unit of "from" in "to" units43,560

Area Converter: formula

Result = value × (from-unit factor ÷ to-unit factor), factors relative to square meters

NIST Handbook 44: Units and Systems of Measurement

Common error: Multiplying by the length ratio instead of its square. Twelve inches per foot does not turn square feet into square inches; 144 does.

Areas scale with the square of length, so a conversion factor for lengths must be squared. Land measures can differ by region, such as the survey acre. Rounded results add error for large areas.

Property records may use a different measurement standard than a listing. Land is measured in acres, hectares and square miles, and a hectare is 10,000 square meters, about 2.47 acres. Floor areas are measured differently by country, as net internal area, gross area or carpet area, so the same building can have different numbers depending on the rule used.

Area Converter: changing Area to convert

Area to convertConverted value1 unit of "from" in "to" units
0.834,84843,560
0.939,20443,560
1 (example)43,56043,560
1.147,91643,560
1.252,27243,560

Area Converter: compare input ranges

InputTested fromToConverted value: low inputConverted value: high inputSwing
Starting unitSquare inchesSquare miles0.0069427,878,40027,878,400 (247%)
Requested unitSquare inchesSquare miles6,272,6400.001566,272,640 (14400%)
Area to convert0.91.139,20447,9168,712 (20%)

Area Converter: individual input comparisons

InputValueConverted value1 unit of "from" in "to" units
Area to convert0.834,84843,560
0.939,20443,560
143,56043,560
1.147,91643,560
1.252,27243,560
Starting unitSquare inches0.006940.00694
Square feet11
Square yards99
Square meters10.810.8
Acres43,56043,560
Hectares107,639.1107,639.1
Square kilometers10,763,910.410,763,910.4
Square miles27,878,40027,878,400
Requested unitSquare inches6,272,6406,272,640
Square feet43,56043,560
Square yards4,8404,840
Square meters4,046.94,046.9
Acres11
Hectares0.4050.405
Square kilometers0.004050.00405
Square miles0.001560.00156

Area Converter: which assumptions move the result?

Area Converter: Converted value as Starting unit changesConverted value starts at 0.00694. Moving Starting unit from Square inches to Square miles changes it to 27,878,400, with Area to convert 1; Requested unit Square feet kept fixed.Square inches0.00694Square feet1Square yards9Square meters10.8Acres43,560Hectares107,639.1Square kilometers10,763,910.4Square miles27,878,400
Area units describe a surface, so their factors cannot be replaced by unsquared length factors. Keeping the numeral one and requesting square feet gives about 0.00694 from a square inch and 27,878,400 from a square mile. These endpoints refer to different starting surfaces. Select the original area unit explicitly when copying a land, flooring or drawing measurement.
Area Converter: Converted value as Requested unit changesConverted value starts at 6,272,640. Moving Requested unit from Square inches to Square miles changes it to 0.00156, with Area to convert 1; Starting unit Acres kept fixed.Square inches6,272,640Square feet43,560Square yards4,840Square meters4,046.9Acres1Hectares0.405Square kilometers0.00405Square miles0.00156
One acre remains the same surface throughout this destination-unit comparison. It displays as 6,272,640 square inches or about 0.00156 square miles. A smaller destination unit requires a larger count of units. This converter does not establish a property's surveyed boundary or remove uncertainty in its measured dimensions; it only changes the units of the entered area.

Area Converter: values and definitions

Quantity and definitionValue used
Area to convert1
Starting unit — Unit to convert from.Acres
Requested unit — Unit to convert to.Square feet
Converted value43,560
1 unit of "from" in "to" units43,560

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Area units differ by squares, not by the base length, which is why conversions surprise people. A foot is 12 inches but a square foot is 144 square inches. An acre is 43,560 square feet, a number that comes from old farming measures and not from any metric logic.

Listings, plats and satellite tools each favor a different unit, so a lot size can look very different depending on where you read it. Useful reference values: one acre is 43,560 square feet, one hectare is 10,000 square meters or about 2.47 acres, and one square mile holds 640 acres. A square meter is about 10.76 square feet.

For scale, an American football field with end zones is 57,600 square feet, about 1.32 acres, and a soccer pitch of 105 by 68 meters is about 0.71 hectares.

Confirm both units are squared. Converting a length unit by mistake gives a figure off by the factor squared.

Calculate areas on the rectangle, circle and triangle calculators, and acreage on the land acreage page. The length converter changes the underlying lengths, and the flooring, paint and roofing calculators use square footage. The price per square foot page relates area to cost.

Will unit conversion reconcile two different floor-area definitions?

No. Net usable area, gross external area and a listing’s stated floor area can include different spaces. Converting their units does not make those definitions equivalent.

Do I multiply feet-to-meters by one factor or two for area?

Two. Squaring 0.3048 gives 0.09290304 square meters per square foot. Thus 100 square feet is 9.290304 square meters.

How many square feet make up one acre?

43,560 square feet, or about a 208.7-foot square.

How do I convert square feet to square meters?

Multiply by 0.0929. So 1,000 square feet is about 92.9 square meters.

How big is a hectare?

10,000 square meters, about 2.47 acres, or roughly the size of a square 100 meters on each side.