Enter an area in acres to find the same land area in hectares, including fractional or very small acre values.
Table of contents
How to use our Acres to Hectares Converter
- Copy the acreage from a deed, property listing, survey, map, farm record, or your measurement.
- Enter it in "Area (acres)". You can use decimals, standard comma grouping such as 1,000, scientific notation such as 1e-6, or a suffix such as "2.5 acres".
- Choose "Show result rounded to" and whether to enable "Also show square meters and square feet", then select "Calculate" to see "Area in hectares". Use "Higher-precision value (ha)" for the calculation before your selected display rounding.
- Check the direction if needed: 1 acre equals 0.40468564 ha, so the hectare result should be less than half the acreage.
Definitions
Acre: A unit of area often used for land in the United States.
Hectare (ha): A metric unit of area equal to 10,000 square meters.
Scientific notation: A compact number format for very small or large values. For example, 1e-6 means 0.000001.
Common mistakes and quick fixes
Mistake: Typing comma groups incorrectly, such as 1,00.
Fix: Use 1,000 for one thousand acres, or enter 1000 without commas.
Mistake: Entering a negative area.
Fix: Enter zero or a positive area. Negative numbers do not describe a physical land area in this converter.
Mistake: Dividing by the conversion factor when checking the answer by hand.
Fix: Multiply acres by 0.40468564224 to get hectares.
Limitations & Key Assumptions / Boundary Conditions
- This converter changes area units only. It does not establish property boundaries, survey accuracy, or a legal land description.
- Enter a nonnegative area magnitude. Zero is valid, but negative acreage is not a physical land area for this conversion.
- "Show result rounded to" offers 2, 4, 6, or 8 decimal places, with 8 selected by default. A very small nonzero area can round to zero at the selected precision; the calculator then also shows a higher-precision value and explains the rounding.
Methodology
Conversion method
The calculation uses 1 international acre = 4,046.8564224 square meters and 1 hectare = 10,000 square meters. Dividing these areas gives 0.40468564224 hectare per acre. [1]
hectares = acres * 0.40468564224
Worked example
For 2.5 acres, multiply 2.5 by 0.40468564224. The unrounded answer is 1.0117141056 hectares, which displays as 1.01171411 ha with the default 8-decimal setting.
2.5 * 0.40468564224 = 1.0117141056 ha
The calculator keeps the unrounded value during the conversion and rounds the main answer using "Show result rounded to". "Higher-precision value (ha)" shows up to 15 significant digits before that selected rounding. If "Also show square meters and square feet" is checked, it also multiplies acres by 4,046.8564224 for square meters and by 43,560 for square feet.