Acres to hectares

1 acre = 0.404686 hectares

Type a value in acres (ac) to get hectares (ha) straight away. An acre is smaller than a hectare, so the number goes down. Both units belong to area, measured here against the square meter.

FromTo0.40468564

1 ac = 0.40468564 ha

Formula

ha = ac × 0.40468564

One acre is 0.40468564 hectares, so multiply by that factor. You can also divide by 2.47105, the number of acres in one hectare. Here ac is the value in acres and ha is the result in hectares.

Worked example: 2 acres × 0.40468564 = 0.809371 hectares.

Acres to hectares table

acres (ac)	hectares (ha)
1 ac	0.404686 ha
2 ac	0.809371 ha
3 ac	1.21406 ha
4 ac	1.61874 ha
5 ac	2.02343 ha
6 ac	2.42811 ha
7 ac	2.8328 ha
8 ac	3.23749 ha
9 ac	3.64217 ha
10 ac	4.04686 ha
15 ac	6.07028 ha
20 ac	8.09371 ha
25 ac	10.1171 ha
30 ac	12.1406 ha
40 ac	16.1874 ha
50 ac	20.2343 ha
60 ac	24.2811 ha
75 ac	30.3514 ha
100 ac	40.4686 ha

Everyday acres in hectares

What it is	ac	ha
a quarter-acre house lot	0.25 ac	0.101171 ha
one acre	1 ac	0.404686 ha
a small farm field	2.5 ac	1.01171 ha
a smallholding	5 ac	2.02343 ha
one square mile	640 ac	258.999 ha

Quick estimate in your head

Multiply by about 0.4. For 2 ac that gives 0.8 ha against an exact 0.809371 ha, an error of 1.2%.

About the units

Acre (ac). 43,560 square feet or about 4,047 m². Used for farmland and estates in India, the US and UK.

Hectare (ha). 10,000 m², a square 100 m on each side. The metric unit for farmland and forests.

Going the other way, 1 hectare is 2.47105 acres.

Questions

How many hectares are in 1 acre?

1 acre is 0.404686 hectares, and 1 hectare is 2.47105 acres.

How do I convert acres to hectares?

Use ha = ac × 0.40468564. For example, 2 acres × 0.40468564 = 0.809371 hectares.

Is the acre to hectare factor exact?

The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.

How much is one square mile in hectares?

640 ac is 258.999 ha.

Source for the conversion factor: NIST Handbook 44, Appendix C (units of area).

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