Acres to Hectares Converter

Land is sold in acres in the United States, the United Kingdom and parts of South Asia, while agricultural statistics and most other countries use hectares. One acre is 4,046.8564224 square meters, about 0.4047 hectares. A hectare is exactly 10,000 square meters, a square 100 m on each side.

1. 1

   Enter a value

   Type a number into the From box. It starts at 1 so you can see the basic ratio straight away. Thousands separators such as 1,250.5 are accepted.

2. 2

   Choose your units

   This page opens with its own units selected. Use either dropdown to pick any other unit in the category, or tap a unit in the all-units list to make it the target.

3. 3

   Read the result

   The answer updates as you type and the matching formula is shown underneath. There is no Convert button to press.

4. 4

   Swap, copy or clear

   Swap reverses the direction, Copy Result copies a line such as 1 km = 0.621371 mi, and Clear empties the input so you can start again.

Input

• Supported
  Whole numbers25
• Supported
  Decimal numbers2.75

  Use a dot as the decimal separator.

• Supported
  Negative numbers-40

  Calculated for every unit. Quantities such as length or weight are normally positive, while temperatures can be negative.

• Supported
  Thousands separators1,250.5

  Commas must group digits in threes. 1,234 is read as one thousand two hundred thirty-four.

• Supported
  Scientific notation1.5e6

  Useful for very large or very small values (1.5e6 = 1,500,000).

• Not supported
  Comma as decimal mark2,5

  Type 2.5 instead.

• Not supported
  Fractions1/2

  Type 0.5 instead.

• Not supported
  Numbers with unit text5 km

  Enter only the number and choose the unit from the dropdown.

Output

Results use US English formatting (1,234.56) and show up to 6 decimal places with trailing zeros removed. Very small results appear in scientific notation, such as 9.0949e-13, instead of rounding to zero.

Units available in this converter

• Square Meter (m²)
• Square Kilometer (km²)
• Square Centimeter (cm²)
• Square Foot (ft²)
• Square Yard (yd²)
• Acre (ac)
• Hectare (ha)

Common values for the units currently selected above, in both directions.

Tips

• There are about 2.471 acres in a hectare, so a hectare is roughly two and a half acres.
• This tool uses the international acre. The US survey acre differs by about 4 parts per million.

• Square units scale by the square of the length factor, so length ratios cannot be reused.
• The acre is the international acre. Regional land units such as marla, kanal and bigha are not supported.
• Results show up to 6 decimal places. Values are not rounded during calculation, and a non-zero result that would display as 0 is shown in scientific notation.