Hectares to Acres (UK) Converter

The acre is identical in Britain and America. What differs is which unit officialdom uses. Here is the conversion and the local context.

From ha ac To

LIVE

Conversions completed

An acre is the same on both sides of the Atlantic

Unlike the gallon and the fluid ounce, the acre does not differ between Britain and America. Both use the international acre of 4,046.8564224 square metres. What does differ is which unit is used officially: since the 1995 land registration rules, UK land must be registered in hectares, while newspapers, estate agents and farmers still quote acres.

Unit	Square metres	Hectares	Acres
1 hectare	10,000 m²	1	2.4711
1 acre	4,046.86 m²	0.4047	1
1 rood (old UK)	1,011.71 m²	0.1012	0.25
1 perch (old UK)	25.29 m²	0.00253	0.00625
1 square mile	2.59 km²	259.0	640

Hectares to acres

Hectares	Acres	Square metres
0.5 ha	1.24 ac	5 m²
1 ha	2.47 ac	1 m²
2 ha	4.94 ac	2 m²
5 ha	12.36 ac	5 m²
10 ha	24.71 ac	1 m²
20 ha	49.42 ac	2 m²
50 ha	123.55 ac	5 m²
100 ha	247.11 ac	1 m²
200 ha	494.21 ac	2 m²
500 ha	1235.53 ac	5 m²
1000 ha	2471.05 ac	1 m²

What UK farm listings actually mean

The average British farm is about 89 hectares, roughly 220 acres, according to Defra structure data. A 500-acre holding is a large arable farm, not a smallholding.
Scottish estates and sporting estates quote acreage far more often than hectares, even in official brochures.
Natural England and the Forestry Commission work in hectares, so grant schemes and woodland plans will be metric.
An acre is roughly 0.4 hectares, so a quick mental check is to multiply acres by 0.4 to get hectares, or hectares by 2.5 to get acres.
Old deeds may use roods and perches: 4 roods make an acre, 40 perches make a rood. A plot of 2 acres 3 roods 12 perches is 2.887 acres.