Acres to Hectares
Convert acres to hectares instantly. Free, fast, no signup.
How to use this tool
- Enter acres in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your hectares and the full breakdown beneath it.
Convert acres to hectares instantly. Free, fast, no signup.
Formula
Hectares = Acres × 0.40469
One acre = 43,560 ft² = 4,046.8564224 m². One hectare = 10,000 m². Therefore: 1 acre ÷ 10,000 m²/ha = 0.40469 ha.
How it works
To convert acres to hectares, multiply the number of acres by 0.40469. The factor comes from the exact definition of an acre (4,046.8564224 m²) divided by 10,000 m² per hectare. This conversion is frequently needed when reporting agricultural land areas in international contexts where metric units are expected.
Common mistake: Inverting the conversion and multiplying by 2.47105 (the hectares-to-acres factor) instead of 0.40469, which gives an answer that is about 6× too large.
Worked example
Convert 1 acre to hectares
- Start with the input: 1 acre.
- Apply the conversion factor: 1 × 0.40468564224 = 0.40468564224.
- Round to four decimal places: 0.4047 hectares.
1 acre = 0.4047 hectares
Common mistakes to avoid
- Using 0.4 instead of 0.40469, understating the hectare result on large parcels.
- Confusing acres with square miles: 1 square mile = 640 acres, so entering square miles inflates the output 640x.
- Reversing the formula and multiplying by 2.471 (the ha-to-acres factor) instead of 0.40469.
Key terms
- Acre
- A unit of land area in the US customary and imperial systems, defined as exactly 43,560 square feet or 4,046.8564224 square metres.
- Hectare (ha)
- A metric unit of area equal to 10,000 square metres. It is widely used globally for measuring agricultural and forestry land.
- Square Metre (m²)
- The SI base unit of area. The hectare is a derived unit: 1 ha = 10,000 m².
- Metric System
- An international decimal-based measurement system. Land in most of the world is measured in hectares rather than acres.
Frequently asked questions
- How do I convert acres to hectares?
- Multiply the number of acres by 0.404686 to get hectares.