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An accurate area conversion tool for square meters, hectares, acres, square feet, mu, and more.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Enter an area, choose its source unit, and compare the equivalent in the other listed units. The set is square kilometers (km²), hectares (ha), square meters (m²), square centimeters (cm²), square millimeters (mm²), acres (ac), square miles (mi²), square yards (yd²), square feet (ft²), and square inches (in²). The original unit also appears in the results. This list does not include mu, are, square decimeters, or ping.
Each value is converted through square meters. If Fsource and Ftarget are the square-meter equivalents of one source and target unit, respectively:
target value = input × Fsource ÷ FtargetFor the U.S.-familiar pair, one acre is 43,560 square feet. Thus 87,120 ft² ÷ 43,560 = 2 acres. The tool uses the international-foot basis for its customary-unit factors: one foot is exactly 0.3048 m, making one acre 4,046.8564224 m². NIST distinguishes this from the obsolete U.S. survey foot, which is retained only for historical and legacy records.
Area multiplies two lengths. Since 1 m = 100 cm, a square meter contains 100 × 100 = 10,000 square centimeters. The same logic gives 1 km² = 1,000,000 m². Applying a length multiplier only once is a common source of conversion errors.
Results update from the entered number and selected unit. Choose 0–6, 8, or 10 decimal places; the default is 4, and trailing zeros are removed. For example, 1 m² is about 0.0000003861 mi² at 10 decimal places, while at 4 places it rounds to 0. A rounded display of zero means the chosen precision hides a small value.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Confirm whether the document says ft², ac, m², or another supported symbol. Do not infer a unit from a number alone.
Enter an integer or decimal and select the unit it is already measured in. Results refresh automatically and include the input unit for comparison.
Four places suit many quick comparisons. Increase the setting when a small converted value would otherwise round to zero, or use fewer places for a compact display.
Copy a result value and add its unit symbol in your notes or spreadsheet. Selecting a result can also use it as a new input for a reverse check.
For 0.25 acre, multiply by 43,560 to get 10,890 ft². For the reverse direction, divide the square-foot value by 43,560. Keep the source figure and unit beside the converted number when comparing listings or plans.
Use cases
See how the tool fits into real work and everyday tasks.
If one listing gives square feet and another gives square meters, convert both to the same unit before comparing floor area. Preserve the listing’s original number for reference.
Convert acres to hectares or square meters for a consistent worksheet. For legacy survey records, check whether the source uses U.S. survey-foot quantities before relying on a conversion.
Use the matching squared unit for a measured surface. The converter changes area units; it does not calculate an area from length and width.
Q&A
Find concise answers to common questions and confusing cases.
One acre equals 43,560 square feet. Divide a square-foot value by 43,560 to express it in acres.
No. Its ten choices are km², ha, m², cm², mm², ac, mi², yd², ft², and in². Mu and are are not available options.
The result was rounded to the selected number of decimal places. Increase precision to 8 or 10 places to display smaller values.
The listed factors use the international foot. NIST says the U.S. survey foot was superseded from January 1, 2023, except for historical and legacy applications; older survey documents may need their original unit basis checked.
Notes
Review scope, result limitations, and important precautions before use.
Displayed decimal places control rounding, not the accuracy of the original measurement. A conversion cannot correct a rounded, estimated, or mislabeled source value.
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