Acres to Hectares Converter
Enter the area in acres below to convert it to hectares.
Convert Acres to Hectares
Enter a value in acres (ac) to convert to hectares (ha).
Acre to Hectare Conversion Table
Table showing various acre measurements converted to hectares. Click any preset value or arrow to load it into the converter.
| Acres (ac) | Hectares (ha) |
|---|---|
| 1 ac | 0.4046856 ha |
| 2 ac | 0.8093713 ha |
| 5 ac | 2.0234282 ha |
| 10 ac | 4.0468564 ha |
| 15 ac | 6.0702846 ha |
| 20 ac | 8.0937128 ha |
| 25 ac | 10.1171411 ha |
| 30 ac | 12.1405693 ha |
| 50 ac | 20.2342821 ha |
| 75 ac | 30.3514232 ha |
How to Convert Acres to Hectares
To convert acres to hectares, multiply the area by the following conversion ratio: 0.4046856 hectares/acre.
Since one acre is equal to 0.4046856 hectares, you can use this simple formula to convert:
The area in hectares is equal to the area in acres multiplied by 0.4046856.
For example, here's how to convert 10 acres to hectares using the formula above.
How Many Hectares Are in an Acre?
There are 0.4046856 hectares in an acre, which is why we use this value in the formula above.
Our acre to hectare calculator automatically converts your area measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Acres and hectares are both units used to measure area. Keep reading to learn more about each unit.
What Is an Acre?
An acre is a unit of area equal to 4,046.8564224 square meters (m²), the base unit for area. Imperial & US Customary land unit equal to 43,560 square feet. [1]
The acre is classified as a US customary and imperial unit of area. Acres can be abbreviated as ac; for example, 1 acre can be written as 1 ac.
When working with acres (ac) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, acres (ac) are widely used across large-scale industrial, bulk, and macro-level area specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Hectare?
A hectare is a unit of area equal to 10,000 square meters (m²), the base unit for area. Metric land unit equal to 10,000 square meters (approx. 2.471 acres). [2]
The hectare is classified as a metric and SI-compatible unit of area. Hectares can be abbreviated as ha; for example, 1 hectare can be written as 1 ha.
When working with hectares (ha) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, hectares (ha) are widely used across large-scale industrial, bulk, and macro-level area specifications within SI metric workflows, engineering documentation, and technical data sheets.
When converting area between acres (ac) and hectares (ha), keep full floating-point precision (1 ac = 0.4046856 ha; 1 ha = 2.4710538 ac) during intermediate calculations and round only the final hectare figure to match your instrument tolerance.
More Acre & Hectare Conversions
Need to calculate in the opposite direction? Use our hectares to acres converter (ha to ac) to switch your starting unit immediately. You can also explore related tools such as converting square meters to hectares, converting acres to square feet, or converting acres to square miles.
Convert from Acres
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length & Area)·Area Metrology Standard — Acres (ac) to Hectares (ha)
- [2]NIST HB 44 SpecificationNIST HB 44 (Acre, Hectare & Land Survey Tables)·Unit Specifications: Acre (ac) & Hectare (ha)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9 (Area))·Conversion Factors & Mathematical Basis (ac to ha)