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Acres to Hectares Converter

Convert acres to hectares and back. 1 acre = 0.40468564224 hectares exactly.

Area converter
Type an amount. Use the tabs to switch direction.
ac
Result: Hectares
2.0234282hectares
1 ac = 0.40468564 ha
Also equals
20,234.282 m²
Square Meters
217,800 ft²
Square Feet
Learn how we calculate this below

Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.

Updated

On this page
  1. Acres and Hectares
  2. Quick conversion table
  3. Exact factor and source
  4. How to convert acres to hectares
  5. All area units compared
  6. What is an acre?
  7. What is a hectare?
  8. What this converter does not do
  9. Frequently asked questions
  10. References
  11. Related converters

Acres and Hectares

One acre is exactly 0.40468564224 hectares, and one hectare is about 2.47105381467 acres. The converter works both ways: use the two tabs at the top of the tool to choose the direction.

Quick conversion table

Acres to Hectares

AcresHectares
0.25 ac0.10117141 ha
0.5 ac0.20234282 ha
1 ac0.40468564 ha
2 ac0.80937128 ha
5 ac2.0234282 ha
10 ac4.0468564 ha
20 ac8.0937128 ha
40 ac16.187426 ha
80 ac32.374851 ha
100 ac40.468564 ha
160 ac64.749703 ha
640 ac258.99881 ha

Hectares to Acres

HectaresAcres
0.1 ha0.24710538 ac
0.5 ha1.2355269 ac
1 ha2.4710538 ac
2 ha4.9421076 ac
5 ha12.355269 ac
10 ha24.710538 ac
20 ha49.421076 ac
50 ha123.55269 ac
100 ha247.10538 ac
500 ha1,235.5269 ac

Exact factor and source

ConversionValueBasis
1 acre in hectares0.40468564224exact. 1 acre = 43,560 ft2 with the international foot = 4,046.8564224 m2 exactly (derived; the US survey acre is slightly larger)
1 hectare in acres2.47105381467rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): the hectare is accepted for use with the SI; 1 ha = 10,000 m2

How to convert acres to hectares

  1. Step oneTake the number of acres.
  2. Step twoMultiply it by 0.40468564224.
  3. Step threeThe result is the number of hectares.
  4. Step fourTo go back, divide by 0.40468564224, or multiply by 2.47105381467.
ha = ac x 0.40468564224

Example: 5 ac x 0.40468564224 = 2.0234282112 ha.

All area units compared

Each unit written in square meters, the base unit of this tool. Exact values come straight from the definitions.

UnitSymbolValue in square meters
Square metersm²1 square meter
Square feetft²0.09290304 square meters
Square inchesin²0.00064516 square meters
Acresac4,046.8564224 square meters
Hectaresha10,000 square meters
Square kilometerskm²1,000,000 square meters
Square milesmi²2,589,988.11034 square meters

What is an acre?

The acre is exactly 43,560 square feet, which is 4,046.8564224 square meters or 0.40468564224 hectares. Land in the US and UK is sold and measured in acres.

What is a hectare?

The hectare (ha) is 10,000 square meters, the area of a square 100 meters on each side. It equals 2.47105381467 acres and is the usual metric unit for farmland.

What this converter does not do

  • Results are rounded for display to 8 significant digits; the stored factor is the exact one.
  • It uses the international acre and foot, not the US survey versions.
  • It converts areas only; it does not turn a length and a width into an area.

Frequently asked questions

How many hectares are in an acre?

1 acre is exactly 0.40468564224 hectares. That factor is exact by definition.

How many acres are in a hectare?

1 hectare is about 2.47105381467 acres.

How many hectares is a 5 acre lot?

5 acres is 2.0234282 hectares, or 20,234.282 square meters.

Where do the factors come from?

Acres: 1 acre = 43,560 ft2 with the international foot = 4,046.8564224 m2 exactly (derived; the US survey acre is slightly larger). Hectares: SI Brochure, 9th edition (BIPM 2019): the hectare is accepted for use with the SI; 1 ha = 10,000 m2.

References