Convert Hectare to Are
Convert hectares to ares instantly. 1 hectare = 100 are — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Are to Hectare converter for the reverse conversion.
Units explained
Hectare
A hectare is a metric unit of area equal to 10,000 square meters, or one square hectometer. It is the most widely used metric unit for land measurement worldwide.
Defined as 100 ares, equal to one square hectometer. The name was introduced in 1795 in France as part of the metric system.
Hectares are the standard unit for agricultural land measurement worldwide except in the US (which uses acres). 1 hectare equals 2.47105 acres. In India, hectares are used in modern agricultural census and land records alongside traditional regional units.
Adopted in France in 1795; standardized internationally through the SI system.
Are
An are is a metric unit of area equal to 100 square meters. It is used in some European countries for land measurement, especially for smaller plots like vineyards and gardens.
Introduced as part of the French metric system in 1795. The name comes from the Latin 'area' meaning surface or open ground.
Ares are still used in some European countries (especially Switzerland and France) for small-plot land measurement. In Switzerland, an are is a common unit for vineyard size. Most modern contexts prefer square meters or hectares.
Defined in 1795 in France as part of the original metric system.
Hectare to Are conversion formula
The relationship between hectares and ares:
To convert hectares to ares, multiply the value in hectares by 100. To reverse, multiply ares by 0.01.
How to use this converter
Type a value into the calculator. The result in ares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Are to Hectare converter for the reverse direction.
Step-by-step: convert hectares to ares
- Write down the value in hectares (ha).
- Multiply that value by the factor 100.
- The product is the equivalent value in ares (a).
- To reverse, multiply the are value by 0.01.
Worked examples
Example 1 — Convert 1 ha to a:
1 × 100 = 100 a
Example 2 — Convert 100 ha to a:
100 × 100 = 10000 a
Real-world example — Road-sign distances across systems
A 100-hectare road sign converts cleanly into ares — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 ha × 100 = 10000 a
Real-world example — Endurance race distances
A 50-hectare cycling or running race converts to a recognizable distance in ares. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 ha × 100 = 5000 a
Real-world example — Maritime exclusion zone
A 200-hectare exclusion zone (a common maritime boundary) converts to a different value in ares that's useful when describing the same zone in everyday land-distance units.
200 ha × 100 = 20000 a
Hectare to Are conversion table
Standard reference values for converting hectares to ares:
| Hectare [ha] | Are [a] |
|---|---|
| 0.01 | 1 |
| 0.1 | 10 |
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 4 | 400 |
| 5 | 500 |
| 10 | 1000 |
| 20 | 2000 |
| 30 | 3000 |
| 40 | 4000 |
| 50 | 5000 |
| 100 | 10000 |
| 500 | 50000 |
| 1000 | 100000 |
Frequently asked questions
How many ares is 1 hectare?
How do I convert hectares to ares?
How do I convert ares back to hectares?
How many ares is 100 hectares?
Popular area unit conversions
Convert Hectare to other area units
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Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 ha = 100 a) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.