land-area-conversion-calculator
Convert land area between ares and hectares with this free calculator. Learn the formula, see worked examples, and find an ares-to-hectares conversion table.
Land Area Conversion Calculator
Convert between ares and hectares with this simple calculator.
Conversion Information
- 1 hectare = 100 ares
- 1 are = 0.01 hectares
Documentation
Land Area Conversion Calculator
A land area conversion calculator converts a measurement between ares and hectares, two metric units used to describe the size of land. Enter a value, choose the starting unit, and the calculator returns the equivalent value in the other unit.
What is an are?
An are is a metric unit of area equal to 100 square meters, roughly the size of a small house lot. France introduced the unit in a decree of April 1795, which defined the are as "the measure of area for land, equal to a square, ten meters to a side." It is still used in some countries to describe garden plots and small fields.
What is a hectare?
A hectare is a metric unit of area equal to 10,000 square meters, or 100 ares. It is widely used to report the size of farms, forests, and other large tracts of land. A square with sides of 100 meters covers exactly one hectare, because 1 ha = 1 hm² = 10⁴ m².
Ares to hectares formula
To convert ares to hectares, multiply the number of ares by 0.01.
Hectares = Ares × 0.01
Hectares to ares formula
To convert hectares to ares, multiply the number of hectares by 100.
Ares = Hectares × 100
Both formulas come from the same fixed relationship: one hectare equals exactly 100 ares. The ratio is exact. The calculator shows the result with up to six decimal places.
Worked examples
Example 1: Ares to hectares A farmer owns a plot measuring 250 ares. In hectares, that is: 250 × 0.01 = 2.5 hectares
Example 2: Hectares to ares A vineyard covers 3.75 hectares. In ares, that is: 3.75 × 100 = 375 ares
Example 3: A small garden A garden plot of 0.5 ares converts to: 0.5 × 0.01 = 0.005 hectares (equal to 50 square meters)
Ares to hectares conversion table
| Ares | Hectares | Square meters |
|---|---|---|
| 1 | 0.01 | 100 |
| 10 | 0.1 | 1,000 |
| 50 | 0.5 | 5,000 |
| 100 | 1 | 10,000 |
| 500 | 5 | 50,000 |
| 1,000 | 10 | 100,000 |
How to use the calculator
Type a number into the input field, then select whether that number is in ares or hectares. The calculator shows the converted value immediately and updates it as the number changes. A copy button lets the user paste the result elsewhere. The calculator only accepts zero or positive numbers; a negative entry triggers a validation message instead of a result.
Where these units are used
Farmers and agricultural agencies use hectares to report crop areas and land holdings, since a hectare is large enough to describe a whole field without unwieldy numbers. Ares remain useful for smaller parcels, such as house plots or allotment gardens, where a hectare would be too coarse a unit. Land registries, foresters, and government statistics offices in many countries record area in hectares.
Frequently asked questions
How many ares are in a hectare? One hectare equals 100 ares. This is a fixed, exact ratio, not an approximation.
What is the difference between an are and an acre? An are is a metric unit equal to 100 square meters. An acre is an imperial unit equal to 4,046.8564224 square meters, or about 4,046.86. One acre is about 40.47 ares.
Is the are part of the metric system? Yes, but it is not an SI unit, and neither is the hectare. The NIST Guide to the SI lists the hectare among units accepted for use with the SI. It says the CIPM allowed the are, along with a few other units, to continue to be used with the SI where it was already established. The hectare is the more commonly used unit today.
How do I convert ares or hectares to square meters? One are equals 100 square meters. One hectare equals 10,000 square meters. Multiply the number of ares by 100, or the number of hectares by 10,000, to get square meters.
Can the calculator handle decimal values? Yes. Any positive number, including decimals, converts the same way. For example, 0.5 ares equals 0.005 hectares.
Why does the calculator reject negative numbers? A land area cannot be negative, so the calculator flags negative input as invalid rather than returning a converted value.
References
- National Institute of Standards and Technology (NIST). NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically. Conversion factors — 1 are = 100 m²; 1 hectare = 10,000 m².
- Roy Rosenzweig Center for History and New Media, George Mason University. Culture: Weights and Measures (decree of April 1795). 1795 decree on weights and measures — the are defined as a square ten meters to a side.
- National Institute of Standards and Technology (NIST). NIST Guide to the SI, Chapter 5: Units Outside the SI. Units outside the SI — 1 ha = 1 hm² = 10⁴ m², accepted for use with the SI; the are permitted to continue in use with the SI.
- National Institute of Standards and Technology (NIST). Revised Unit Conversion Factors (U.S. survey foot deprecation). Revised unit conversion factors — 1 acre = 4,046.8564224 m².