Area conversion
Hectares to Acres (ha to ac)
Express a field or land-parcel area in acres when the original record uses hectares. Keep the unrounded result if you will total several parcels.
1 ha ≈ 2.471 ac — the calculator keeps the stored factor; this summary may be rounded.
A field with an area of 2 ha
- Starting measurement
- 2 ha
- Converted value (rounded if needed)
- 4.9421 ac
The result describes the same whole area. It does not account for which parts are usable, cultivated or excluded from a property description.
Hectares to Acres conversion chart
| hectares | acres |
|---|---|
| 1 ha | 2.471 ac |
| 2 ha | 4.9421 ac |
| 3 ha | 7.4132 ac |
| 4 ha | 9.8842 ac |
| 5 ha | 12.3553 ac |
| 6 ha | 14.8263 ac |
| 7 ha | 17.2974 ac |
| 8 ha | 19.7684 ac |
| 9 ha | 22.2395 ac |
| 10 ha | 24.7105 ac |
| 12 ha | 29.6526 ac |
| 15 ha | 37.0658 ac |
| 18 ha | 44.479 ac |
| 20 ha | 49.4211 ac |
| 25 ha | 61.7763 ac |
| 30 ha | 74.1316 ac |
| 40 ha | 98.8422 ac |
| 50 ha | 123.553 ac |
| 60 ha | 148.263 ac |
| 75 ha | 185.329 ac |
| 100 ha | 247.105 ac |
How to convert by hand
Reference relationship (display may be rounded)
1 ha = 2.47105381 ac
- Multiply the amount in hectares by the number of acres per unit.
- Use the calculator for the stored precision; copying a short displayed factor introduces extra rounding.
- Round the result to suit your measurement, after completing the calculation.
Related conversions
About hectares and acres
Area conversions apply to the whole surface or plot. They cannot tell you a room’s width, a boundary length or how much material to allow for cutting waste.
Hectare
Metric10,000 square metres, equal in area to a square 100 m on each side. A plot need not be square to be measured in hectares.
Commonly used for: Fields, parks and larger land parcels.
Acre
US / Imperial43,560 square feet, about 0.4047 hectares. The converter uses square international feet.
Commonly used for: Land listings, farm areas and comparisons with hectare-based maps.
Questions
Is the side of a hectare always 100 metres?
A square of one hectare has sides of 100 m, but a hectare itself only specifies an area of 10,000 m². A field of that area can have a different shape and different side lengths.
How do I convert acres back to hectares?
Enter the value in the acres field above to work backwards, or open the Acres to Hectares converter. This uses the stored factors rather than dividing by a rounded number copied from the chart.
Why might the chart and calculator show different decimal places?
The chart uses a compact rounded display. The editable calculator can show up to six decimal places and uses the factors or temperature formulas stored in the library. More displayed digits do not make the original measurement more precise.
Precision and source
The calculator uses stored conversion factors and temperature formulas, then rounds the result for display. A short decimal in a chart is not a claim of exactness. For a calculation with several steps, keep as much precision as the original measurement supports and round at the end.
These acres use international feet. NIST also lists historical US survey-foot measures; use the definition stated in a survey rather than assuming the two are identical.
Reference: NIST SP 811 conversion factors. Its alphabetical tables distinguish unit variants and temperature readings from intervals. Published by ToolsNow. Report a conversion problem.
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