What this calculator does
Ha to acres is a conversion Australian rural buyers, farmers and real estate listings run into constantly, since Australia measures land officially in hectares, the metric standard, while many people still think and talk about property size in acres, particularly for smaller rural residential blocks (often called "hobby farms" or "lifestyle blocks").
This calculator converts hectares to acres or acres to hectares, both directions, using the exact 2.47105 factor, with the equivalent in square metres shown alongside for smaller blocks where that unit is more useful.
The formula
One hectare equals 10,000 square metres and converts to acres by multiplying by 2.47105. One acre converts to hectares by dividing by the same factor. Both units measure area, not a length, so a doubling of one side of a square block quadruples the area in either unit.
| Term | Meaning |
|---|---|
| Hectare (ha) | The metric unit of land area, equal to 10,000 square metres or 100 metres by 100 metres, used as Australia's official unit for land measurement. |
| Acre | An imperial unit of land area, historically the amount a team of oxen could plough in a day, still widely used informally in Australia for rural and farm land. |
| 2.47105 | The number of acres in one hectare, used to convert in both directions. |
The inputs explained
| Field | What to enter |
|---|---|
| Value | The value to convert. |
| Convert | Choose whether to convert hectares to acres, or acres to hectares. |
When to use it
Sizing up a rural property listing
An Australian real estate listing quoted in hectares converts to acres for a buyer more used to thinking in acres, or the other way around when comparing listings from different sources.
Converting a farm or lifestyle block size for planning
Council zoning minimums, fencing quotes and irrigation planning in Australia are usually specified in hectares, so a block size known in acres needs converting before those figures line up.
Comparing Australian and international land sizes
Countries that still use acres as their primary unit, such as the US for some agricultural reporting, need a hectare figure converted to acres (or vice versa) for a fair size comparison against an Australian property.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
Ha to acres, across a range of Australian block and farm sizes
A range of hectare values, from a small rural residential block to a large farm, each converted to acres.
| Hectares | Acres | In square metres |
|---|---|---|
| 1 | 2.47 ac | 10,000 m² |
| 10 | 24.71 ac | 100,000 m² |
| 50 | 123.55 ac | 500,000 m² |
| 100 | 247.11 ac | 1,000,000 m² |
| 500 | 1,235.53 ac | 5,000,000 m² |
| 1000 | 2,471.05 ac | 10,000,000 m² |
Acres to ha, across a range of values
A range of acre values, each converted to hectares.
| Acres | Hectares | In square metres |
|---|---|---|
| 1 | 0.40 ha | 4,047 m² |
| 10 | 4.05 ha | 40,469 m² |
| 50 | 20.23 ha | 202,343 m² |
| 100 | 40.47 ha | 404,686 m² |
| 500 | 202.34 ha | 2,023,431 m² |
| 2500 | 1,011.72 ha | 10,117,157 m² |
Questions
How many acres is 1 ha?
Exactly 2.47105 acres. This is a fixed conversion factor, since both hectares and acres are defined units of area.
How do I convert ha to acres in Australia specifically?
The conversion factor is the same worldwide, 2.47105 acres per hectare; there is no separate "Australian acre". What differs in Australia is that hectares are the official unit on titles and government land records, while acres remain common in everyday conversation about rural property.
Why does Australia use hectares instead of acres?
Australia adopted the metric system fully in the 1970s, including for land measurement, so hectares are the legal and official unit on property titles and surveys, even though acres persist informally, especially for older or rural properties.
How big is 1 hectare compared to a sports field?
About 1.8 hectares is a rough approximation for a large Australian Rules football oval such as the MCG, so 1 hectare is a little over half that size, and 100 hectares is roughly 55 such ovals.
For the general hectares-to-acres conversion without the Australian framing, see the hectares to acres converter. For the broader metric and imperial area ladder, see the area converter.