Convert hectares to acres
1 ha = 2.47105 ac · 1 ac = 0.404686 ha · Exact by definition
1 ha = 2.47105 ac
The same value in other units
- square centimetre
- 100000000 cm²
- square metre
- 10000 m²
- square kilometre
- 0.01 km²
- square foot
- 107639 ft²
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
Convert a whole list
Paste one conversion per line, written the way you would say it: "5 km to mi". Handy for a column copied out of a spreadsheet.
Area
hectares to acres: conversion table
| hectare | acre |
|---|---|
| 1 ha | 2.47105 ac |
| 2 ha | 4.94211 ac |
| 3 ha | 7.41316 ac |
| 5 ha | 12.3553 ac |
| 10 ha | 24.7105 ac |
| 20 ha | 49.4211 ac |
| 25 ha | 61.7763 ac |
| 50 ha | 123.553 ac |
| 100 ha | 247.105 ac |
| 250 ha | 617.763 ac |
| 500 ha | 1235.53 ac |
| 1000 ha | 2471.05 ac |
| acre | hectare |
|---|---|
| 1 ac | 0.404686 ha |
| 2 ac | 0.809371 ha |
| 3 ac | 1.21406 ha |
| 5 ac | 2.02343 ha |
| 10 ac | 4.04686 ha |
| 20 ac | 8.09371 ha |
| 25 ac | 10.1171 ha |
| 50 ac | 20.2343 ha |
| 100 ac | 40.4686 ha |
| 250 ac | 101.171 ha |
| 500 ac | 202.343 ha |
| 1000 ac | 404.686 ha |
How the conversion works
ac = ha × 2.4710538
Both units are defined exactly, so the precision of the hectares to acres result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
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