Convert Hectare to Acre
Convert hectares to acres instantly. 1 hectare = 2.4710538147 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre 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.
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Hectare to Acre conversion formula
The relationship between hectares and acres:
To convert hectares to acres, multiply the value in hectares by 2.4710538147. To reverse, multiply acres by 0.4046856422.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Hectare converter for the reverse direction.
Step-by-step: convert hectares to acres
- Write down the value in hectares (ha).
- Multiply that value by the factor 2.4710538147.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 0.4046856422.
Worked examples
Example 1 — Convert 1 ha to ac:
1 × 2.4710538147 = 2.4710538147 ac
Example 2 — Convert 100 ha to ac:
100 × 2.4710538147 = 247.1053814672 ac
Real-world example — Endurance race distances
A 50-hectare cycling or running race converts to a recognizable distance in acres. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 ha × 2.4710538147 = 123.5526907336 ac
Real-world example — Maritime exclusion zone
A 200-hectare exclusion zone (a common maritime boundary) converts to a different value in acres that's useful when describing the same zone in everyday land-distance units.
200 ha × 2.4710538147 = 494.2107629343 ac
Real-world example — Coastal cruise distances
A 10-hectare coastal sailing route converts to a different value in acres — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 ha × 2.4710538147 = 24.7105381467 ac
Hectare to Acre conversion table
Standard reference values for converting hectares to acres:
| Hectare [ha] | Acre [ac] |
|---|---|
| 0.01 | 0.0247105381 |
| 0.1 | 0.2471053815 |
| 1 | 2.4710538147 |
| 2 | 4.9421076293 |
| 3 | 7.413161444 |
| 4 | 9.8842152587 |
| 5 | 12.3552690734 |
| 10 | 24.7105381467 |
| 20 | 49.4210762934 |
| 30 | 74.1316144401 |
| 40 | 98.8421525869 |
| 50 | 123.5526907336 |
| 100 | 247.1053814672 |
| 500 | 1235.5269073358 |
| 1000 | 2471.0538146717 |
Frequently asked questions
How many acres is 1 hectare?
How do I convert hectares to acres?
How do I convert acres back to hectares?
How many acres is 100 hectares?
Popular area unit conversions
Convert Hectare to other area units
Show all Hectare conversions
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 = 2.4710538147 ac) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.