Acres to Hectares Converter ac → ha

1 acre (ac) = 0.4046856422 hectares (ha). Type a value below — the conversion happens instantly, entirely on your device.

From

1 ac = 0.4046856422 ha

Precision

100 acres = 40.468564 hectares

100 × 0.404686 = 40.468564

1 ac equals 0.404686 ha, so multiplying by 0.404686 converts the value. The result describes the exact same quantity — only the measuring stick changes.

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How to convert acres to hectares

hectares = acres × 0.4046856422 — multiply the acre value by 0.404686.

Example: 100 ac = 40.4686 ha.

To convert the other way: acres = hectares ÷ 0.4046856422 — or use the dedicated ha to ac converter .

Acres-to-hectares converts between imperial and metric land measurement. One acre is 0.4047 hectares, so a 100-acre farm is 40.47 ha. One hectare is about 2.47 acres.

Acres to Hectares conversion table

Acres (ac)	Hectares (ha)
0.1	0.040468564
0.25	0.10117141
0.5	0.20234282
1	0.40468564
2	0.80937128
3	1.2140569
4	1.6187426
5	2.0234282
6	2.4281139
7	2.8327995
8	3.2374851
9	3.6421708
10	4.0468564
15	6.0702846
20	8.0937128
25	10.117141
30	12.140569
40	16.187426
50	20.234282
75	30.351423
100	40.468564
250	101.17141
500	202.34282
1000	404.68564

About the units

What is a acre?

An acre is 43,560 square feet, exactly 4,046.8564224 m² — roughly the area of an American football field without the end zones. It is the customary land unit in the US and UK.

What is a hectare?

A hectare (ha) is 10,000 square meters — a 100 m × 100 m square, about 2.47 acres. It is the standard metric unit for land and farm area.

Frequently asked questions

How many hectares are in 1 acre?

1 acre (ac) = 0.4046856422 hectares (ha).

What is the formula to convert acres to hectares?

hectares = acres × 0.4046856422 — multiply the acre value by 0.404686.

How do I convert ac to ha without a calculator?

Multiply by 0.405 for a close estimate. Exact factor: 1 ac = 0.4046856422 ha.

Is this ac-to-ha converter accurate and private?

Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.