Convert 1 ac to ha

How to convert acres to hectares

1. Formula: hectares = acres × 0.40468564
2. Put in the value: 1 acre.
3. Result: 0.40468564 hectares.

Acres to hectares table

Converting the other way: hectares to acres

acres = hectares × 2.471054. So 0.40468564 hectares is back to 1 acre; one hectare is 2.471054 acres. See the hectares to acres table.

Quick estimate in your head

For a rough answer, multiply by about 0.4: 1 × 0.4 ≈ 0.4 ha, against the exact 0.40468564 ha (1.2% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A acre is smaller than a hectare, so the number of hectares must come out smaller than the number of acres. If your answer goes the other way, divide instead of multiplying.

About the units

Acre (ac) and hectare (ha) are both units of area. One acre equals 0.40468564 hectares, and one hectare equals 2.471054 acres. Results on this page are rounded for display; the conversion itself uses the exact definitions.

Area conversions come up when buying flooring, paint or turf, comparing house and flat sizes, and measuring land and gardens.

1 acre in other units

The most readable unit for this amount is acres (1).

• 40,468,564.22 cm2
• 4,046.86 m2
• 0.00404686 km2
• 0.40468564 ha
• 6,272,640 in2
• 43,560 ft2
• 4,840 yd2
• 0.0015625 mi2

How this answer was calculated

The result is worked out from the numbers in this page's address when the page is opened, using exact arithmetic wherever possible and rounding only for display. Nothing is copied from a printed table. If you think an answer is wrong, please tell us through the contact page and we will check it.

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