Acres to Hectares

Convert ac to ha instantly — with a table, common amounts, and a live calculator.

1 ac equals 0.405 ha.

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Result (ha)0.405 ha

ac to ha table

acha
0.25 ac0.101 ha
0.5 ac0.202 ha
0.75 ac0.304 ha
1 ac0.405 ha
1.5 ac0.607 ha
2 ac0.809 ha
2.5 ac1.01 ha
3 ac1.21 ha
4 ac1.62 ha
5 ac2.02 ha
6 ac2.43 ha
7 ac2.83 ha
7.5 ac3.04 ha
8 ac3.24 ha
10 ac4.05 ha
12 ac4.86 ha
15 ac6.07 ha
20 ac8.09 ha
25 ac10.12 ha
50 ac20.23 ha
75 ac30.35 ha
100 ac40.47 ha

ha to ac (reverse)

haac
0.25 ha0.618 ac
0.5 ha1.24 ac
0.75 ha1.85 ac
1 ha2.47 ac
1.5 ha3.71 ac
2 ha4.94 ac
2.5 ha6.18 ac
3 ha7.41 ac
4 ha9.88 ac
5 ha12.36 ac
6 ha14.83 ac
7 ha17.3 ac
7.5 ha18.53 ac
8 ha19.77 ac
10 ha24.71 ac
12 ha29.65 ac
15 ha37.07 ac
20 ha49.42 ac
25 ha61.78 ac
50 ha123.55 ac
75 ha185.33 ac
100 ha247.11 ac

Common amounts

acha
1/8 ac0.0506 ha
1/4 ac0.101 ha
1/3 ac0.135 ha
1/2 ac0.202 ha
2/3 ac0.27 ha
3/4 ac0.304 ha
1 ac0.405 ha
1 1/4 ac0.506 ha
1 1/2 ac0.607 ha
1 3/4 ac0.708 ha
2 ac0.809 ha
2 1/2 ac1.01 ha

How it scales

0.40.81.21.601234ac

1 acre in other units

43560ft²4840yd²4047m²0.4ha

The ratio at a glance

1 ac0.4 ha

Imperial and metric area units

Square inches, square feet, square yards, acres, and square miles belong to the imperial/US system, while square centimeters, square meters, hectares, and square kilometers are metric. A square foot is defined as exactly 0.09290304 square meters, and an acre as exactly 4,046.8564224 square meters.

Area conversions are exact and rest on fixed factors — for more unit pairs, use our area conversion hub.

Related conversions

Frequently asked questions

How many ha are in a ac?

1 ac equals 0.405 ha.

How many ha are in 2 ac?

2 ac equal 0.809 ha.

How do I convert ac to ha?

Divide the number of ac by 2.47 to get ha.

How big is an acre?

One acre equals exactly 4,046.8564224 square meters (43,560 square feet, or 4,840 square yards) and about 0.4047 hectares. There are 640 acres in a square mile.

Why are there imperial and metric area units?

Square inches, square feet, square yards, acres, and square miles belong to the imperial/US system, while square centimeters, square meters, hectares, and square kilometers are metric. All conversions rest on fixed, exact factors.

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