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Acres to Hectares (ac to ha) Converter

1 acre (ac) = 0.404686 hectares (ha). To convert acres to hectares, multiply by 0.404686: 5 ac × 0.404686 = 2.02343 ha.

1 ac = 0.4046856422 ha
Convert the other way: Hectares to Acres

Quick facts

How to convert acres to hectares

  1. Take the value in acres.
  2. Multiply it by 0.404686 (the number of hectares in one acre).
  3. Round the result to the precision you need.
ha = ac × 0.404686

Worked example (a small farm): 5 ac × 0.404686 = 2.02343 ha.

To convert hectares back to acres, multiply by 2.47105, or divide by 0.404686.

Source: NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ.

Acres to Hectares conversion table

Acres to Hectares conversion table
Acres [ac]Hectares [ha]
0.01 ac0.0040468564 ha
0.1 ac0.0404685642 ha
1 ac0.4046856422 ha
2 ac0.8093712845 ha
3 ac1.2140569267 ha
5 ac2.0234282112 ha
10 ac4.0468564224 ha
20 ac8.0937128448 ha
50 ac20.234282112 ha
100 ac40.468564224 ha
1000 ac404.68564224 ha

ac to ha chart from 1 to 100

Hectares to Acres conversion table

Hectares to Acres conversion table
Hectares [ha]Acres [ac]
0.01 ha0.0247105381 ac
0.1 ha0.2471053815 ac
1 ha2.4710538147 ac
2 ha4.9421076293 ac
3 ha7.413161444 ac
5 ha12.3552690734 ac
10 ha24.7105381467 ac
20 ha49.4210762934 ac
50 ha123.5526907336 ac
100 ha247.1053814672 ac
1000 ha2471.0538146717 ac

Acres vs Hectares

AcreHectare
Symbolacha
Equals1 ac = 0.404686 ha1 ha = 2.47105 ac

What is an acre?

A US customary and imperial unit historically based on the area a yoke of oxen could plow in a day. Used in the US and UK for land and real estate.

What is a hectare?

Equal to 10,000 square meters, or a 100-by-100 meter square. Used internationally for land and agricultural area.

Frequently asked questions

How many hectares are in an acre?

There are 0.404686 hectares in 1 acre (1 ac = 0.4046856422 ha).

How many acres are in a hectare?

There are 2.47105 acres in 1 hectare (1 ha = 2.4710538147 ac).

How do I convert acres to hectares?

Multiply the number of acres by 0.404686. For example, 10 ac × 0.404686 = 4.04686 ha. To convert back, multiply by 2.47105.

What is 10 ac in hectares?

10 ac = 4.04686 ha.

What is 100 ac in hectares?

100 ac = 40.4686 ha.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026