What is bigger, an acre or a hectare?

A hectare is bigger. One hectare equals approximately 2.47 acres.

What is the size of an acre?

One acre is 43,560 square feet, or about 4,047 square meters.

Acres to Hectares Converter | ac to ha Calculator

Conversion Formula

ha = ac × 0.404686

To convert acres to hectares, multiply the acre value by 0.404686. One acre is approximately 0.4 hectares.

Complete Guide to Acres to Hectares Conversion

What is a Acres?

An acre is a unit of land area used primarily in the US and UK, equal to 43,560 square feet or about 4,047 square meters. It's commonly used for measuring farmland, estates, and large properties.

What is a Hectares?

A hectare (ha) is a metric unit of area equal to 10,000 square meters or 100 meters × 100 meters. It's the standard for land measurement in agriculture and forestry worldwide.

How the Conversion Works

Multiply acres by 0.404686 to get hectares. This factor is derived from the exact definitions of both units in metric terms.

Why This Conversion Matters

This conversion is essential for international real estate, agricultural trade, environmental reporting, and any land-related transactions across borders.

Step-by-Step Conversion Guide

Follow these steps to convert acres to hectares manually:

Start with your value in acres

Example: You want to convert 5 ac

Apply the conversion formula

Use the formula: ha = ac × 0.404686

Calculate the result

5 ac = 2.0234 ha

✓

Verify your answer

Use our calculator above to double-check your manual calculation.

Quick Mental Math Tip

To convert acres to hectares, multiply the acre value by 0.404686. One acre is approximately 0.4 hectares.

Common Conversions

Acres to Hectares conversion table
Acres (ac)	Hectares (ha)	Hectares → Acres
1 ac	0.4047	1 ha = 2.4711 ac
2 ac	0.8094	2 ha = 4.9421 ac
5 ac	2.0234	5 ha = 12.3553 ac
10 ac	4.0469	10 ha = 24.7105 ac
20	8.0937	20 ha = 49.421 ac
50	20.2343	50 ha = 123.5526 ac
100 ac	40.4686	100 ha = 247.1052 ac
500	202.343	500 ha = 1235.5258 ac
1000	404.686	1000 ha = 2471.0516 ac
5000	2023.43	5000 ha = 12355.2582 ac

Did You Know?

Area conversions are non-linear: doubling the length of each side of a square quadruples its area, which is why area unit ratios are always squared.

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Popular Acres to Hectares Conversions

1 ac= 0.4 ha 2 ac= 0.81 ha 5 ac= 2.02 ha 10 ac= 4.05 ha 40 ac= 16.19 ha 100 ac= 40.47 ha

When You'll Need This Conversion

International Land Sales

Convert US farmland and property listings to hectares for international buyers and investors.

Agricultural Planning

Convert crop acreage to hectares for global agricultural reports and comparisons.

Environmental Studies

Convert forest and conservation area measurements between US and international reporting standards.

Property Development

Translate land plot sizes for international development projects and planning permits.

Pro Tips for Accurate Conversions

Use "multiply by 0.4" for estimates

For quick mental math, multiply acres by 0.4 to get approximate hectares (2.4% under, but close enough).

Know key benchmarks

1 acre ≈ 0.4 ha, 2.5 acres ≈ 1 ha, 100 acres ≈ 40 ha. Use these for quick estimates.

Football field reference

An American football field is about 1.32 acres or 0.53 hectares. A soccer pitch is about 1.8 acres or 0.7 ha.

Common Mistakes to Avoid

Confusing acres with hectares

A hectare is 2.47× larger than an acre. Quoting the wrong unit can significantly misrepresent land size.

Always verify which unit is being used, especially in international transactions.

Using the wrong conversion direction

Acres to hectares: multiply by 0.4. Hectares to acres: multiply by 2.47.

Remember: hectares are bigger, so you get a smaller number when converting acres to hectares.

History & Background

The acre originated in medieval England as the amount of land a yoke of oxen could plow in one day. The hectare was created during the French Revolution as part of the metric system.