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Italiano1 acre = 0.404686 hectare: the formula
An international acre is exactly 4,046.8564224 m² and a hectare is 10,000 m². To convert acres to hectares, multiply by 0.40468564224: ha = acres × 0.404686. Example: 250 acres × 0.404686 = 101.17 ha.
The converter above is already set to acres to hectares, starting from 1 acre, so it reads 1 ac = 0.404686 ha. The result changes as you type, to six significant figures, and the "Formula:" line shows 1 ac = 0.40468564224 ha. To go the other way, click ⇄ "Swap units". The "In every unit" table adds square meters, square kilometers, square centimeters and square feet: one acre is 4,046.86 m² and 43,560 ft².
Acres to hectares conversion chart
| Acres | Hectares | For scale |
|---|---|---|
| 0.25 | 0.10 | Quarter-acre suburban lot |
| 0.5 | 0.20 | Half-acre lot, 2,023.43 m² |
| 1 | 0.40 | 4,046.86 m² |
| 2.5 | 1.01 | Pony paddock, about a hectare |
| 5 | 2.02 | Hobby farm |
| 10 | 4.05 | Small homestead |
| 40 | 16.19 | A quarter-quarter, or "forty" |
| 80 | 32.37 | An eighth of a section |
| 100 | 40.47 | Large city park |
| 160 | 64.75 | Quarter section |
| 250 | 101.17 | Just over 1 km² |
| 640 | 259.00 | One square mile, a section |
| 1,000 | 404.69 | Ranch |
Why you would need hectares
Working with metric documents. Science papers, crop statistics and most countries outside the US report land in hectares. A 250-acre farm in Iowa is 101.17 ha, which makes yields per hectare easy to compare.
UK farms and subsidies. Estate agents still sell land by the acre, but farm payment schemes and land registry maps work in hectares. A 2.5-acre paddock comes to 1.01 ha; a 40-acre field to 16.19 ha.
Canada. Rural listings in Alberta or Saskatchewan often say "quarter section": 160 acres, or 64.75 ha. A full section of 640 acres is one square mile, 258.9988 ha.
Mental math
Multiply by 0.4, or divide by 2.5. A 100-acre property comes out at 40 ha against an exact 40.47, about 1.16% too low.
Frequently asked questions
How many hectares is 1,000 acres?
404.69 hectares, a little over 4 km².
How big is a quarter-acre lot in square meters?
1,011.71 m², or 10,890 ft². A half acre is 2,023.43 m².
Where does the acre's exact value come from?
An acre is defined as 43,560 square feet. With the international foot of 0.3048 m, that gives exactly 4,046.8564224 m².