Convert acre to hectare

1 acre = 0.4046856 hectares. Enter any value below for an exact conversion.

Value in acres

1 ac =

0.4046856 ha

hectares

Need the reverse? Convert hectare to acre →

Formula

1 acre = 0.4046856 hectares
hectare = acres × 0.4046856
acre = hectares × 2.471054

acre to hectare conversion table

1 ac0.4046856 ha

2 ac0.8093713 ha

3 ac1.214057 ha

5 ac2.023428 ha

10 ac4.046856 ha

20 ac8.093713 ha

25 ac10.11714 ha

50 ac20.23428 ha

100 ac40.46856 ha

1000 ac404.6856 ha

About converting acres to hectares

Acres to hectares is a land-measurement conversion for real estate, farming, and mapping between imperial and metric systems. One acre is about 0.405 hectares.

Method & sources

Conversions use exact legal definitions rather than rounded approximations: 1 inch = 2.54 cm and 1 pound = 0.45359237 kg (fixed by the 1959 international yard and pound agreement), 1 mile = 1.609344 km, and 1 US liquid gallon = 3.785411784 litres. Temperatures convert with °F = °C × 9⁄5 + 32 and K = °C + 273.15. Results are rounded only for display.

Page last updated: October 1, 2026

Frequently asked questions

How many hectares are in a acre?

One acre equals 0.4046856 hectares. So 10 acres is 4.046856 hectares. Use the converter above for any value.

What is the formula to convert acres to hectares?

1 acre = 0.4046856 hectares hectare = acres × 0.4046856 acre = hectares × 2.471054

Is the acre-to-hectare conversion exact?

Yes. The conversion factor between acres and hectares is defined exactly, so results are precise — only rounded for display.

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