Acre to Hectare Converter

Convert acres to hectares and vice versa with precision. This converter handles land area measurements commonly used across the UK for agricultural land, estates, and property development.

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Quick Conversions

Acre to Hectare Conversion Table

Common land area conversions between acres and hectares for quick reference.

Acres (ac) Hectares (ha)
0.25 0.1012
0.5 0.2023
1 0.4047
2 0.8094
5 2.0234
10 4.0469
20 8.0937
50 20.2343
100 40.4686
250 101.1714
500 202.3428
1,000 404.6856

Conversion Formulas

Acres to Hectares

Hectares = Acres × 0.4046856422

Multiply the number of acres by 0.4046856422 to get the equivalent area in hectares.

Example: Convert 15 acres to hectares
15 ac × 0.4046856422 = 6.0703 ha

Hectares to Acres

Acres = Hectares × 2.4710538147

Multiply the number of hectares by 2.4710538147 to get the equivalent area in acres.

Example: Convert 8 hectares to acres
8 ha × 2.4710538147 = 19.7684 ac

Step-by-Step Conversion Process

  1. Identify the value you want to convert
  2. Determine whether you’re converting from acres to hectares or hectares to acres
  3. Apply the appropriate conversion factor (0.4047 for ac to ha, or 2.4711 for ha to ac)
  4. Multiply the original value by the conversion factor
  5. Round the result to the desired number of decimal places (typically 4 decimal places for land measurements)

Understanding Acres and Hectares

Both acres and hectares serve as standard units for measuring land area, yet they originate from different measurement systems. The acre has roots in medieval England, where it represented the amount of land a yoke of oxen could plough in a single day. Today, one acre equals exactly 43,560 square feet or 4,046.86 square metres.

The hectare belongs to the metric system and equals 10,000 square metres or one square hectometre. It’s the preferred unit for land measurement in most countries worldwide, including the UK for official purposes. A hectare provides a straightforward way to express large land areas since 100 hectares equal exactly one square kilometre.

How Big Is Each Unit?

1 Acre: Roughly three-quarters the size of a football pitch (slightly smaller than a standard pitch which is about 1.3 acres).
1 Hectare: Approximately the size of an international rugby pitch (including the in-goal areas) or 1.76 football pitches.
Comparison: One hectare equals about 2.47 acres, meaning a hectare is nearly two and a half times larger than an acre.

UK Land Measurement Context

Whilst the UK officially adopted the metric system in 1965, acres remain deeply embedded in British property and agricultural sectors. Estate agents often advertise residential plots in acres, and farmers traditionally measure their holdings in acres. However, government records, planning documents, and environmental assessments typically use hectares for consistency with European and international standards.

This dual usage means property professionals and landowners frequently need to convert between both units. Agricultural subsidies, conservation schemes, and land registrations often require hectare measurements, whilst local conversations about land size naturally gravitate towards acres.

Everyday Uses

Farmers planning crop rotations might calculate field sizes in both units depending on whether they’re consulting UK farming publications (acres) or European agricultural databases (hectares). Property developers must convert measurements when working with planning authorities that require hectare specifications whilst marketing to buyers who think in acres.

Conservation organisations managing nature reserves frequently work in hectares for international reporting, yet communicate with local communities using acres for better understanding. Golf course designers in the UK often present layouts in acres to club committees whilst submitting planning applications in hectares to local councils.

Area Unit Conversions

Acres to Square Metres

1 ac = 4,046.86 m²

Acres to Square Feet

1 ac = 43,560 ft²

Acres to Square Yards

1 ac = 4,840 yd²

Hectares to Square Metres

1 ha = 10,000 m²

Hectares to Square Kilometres

1 ha = 0.01 km²

Acres to Square Miles

1 ac = 0.0015625 mi²

FAQs

How many hectares are in an acre?
One acre equals approximately 0.4047 hectares. More precisely, 1 acre = 0.4046856422 hectares. This means an acre is just over two-fifths of a hectare.
How many acres make a hectare?
One hectare equals approximately 2.471 acres. The precise conversion is 1 hectare = 2.4710538147 acres, meaning a hectare is nearly two and a half times larger than an acre.
Which is bigger, an acre or a hectare?
A hectare is larger than an acre. Specifically, one hectare is about 2.47 times the size of one acre. In practical terms, a hectare covers 10,000 square metres whilst an acre covers 4,046.86 square metres.
Why does the UK use both acres and hectares?
The UK transitioned to the metric system in 1965, adopting hectares for official measurements. However, acres remain popular in everyday use, particularly in property and agriculture, due to historical convention and familiarity. This creates a situation where both units coexist in different contexts.
How do I convert 100 acres to hectares?
Multiply 100 by 0.4047 to get 40.47 hectares. For a more precise result, use 100 × 0.4046856422 = 40.4686 hectares. This size roughly equals 40 and a half football pitches.
What’s the easiest way to estimate acres from hectares?
For quick mental maths, multiply hectares by 2.5 to get a close approximation in acres. Whilst the exact factor is 2.471, using 2.5 provides a simple estimate that’s accurate enough for most purposes. For instance, 10 hectares × 2.5 = 25 acres (actual: 24.71 acres).
Are UK acres different from US acres?
No, UK and US acres are now identical for practical purposes. Both use the international acre of exactly 4,046.8564224 square metres. The US previously used a survey acre that differed slightly, but this distinction only matters for extremely precise surveying work.
How many square metres in an acre?
One acre contains exactly 4,046.8564224 square metres. For everyday use, rounding to 4,047 m² provides sufficient accuracy. This equals about 40% of a hectare.

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