Acres to Hectares (ac to ha) Converter

Acres to Hectares Converter

This tool converts acres to hectares, letting US and UK farmers and landowners express their land in the international metric standard used worldwide.

1 acre = 0.4047 hectares. Roughly 2.5 acres equal 1 hectare. A 160-acre quarter section equals about 64.7 ha, and a 640-acre section equals 259 ha.

Why Convert

Exporting Produce

International buyers expect land and yield data in metric units, so hectares are essential for trade.

International Reports

The UN, FAO, and scientific journals use hectares for consistent global comparisons of farmland.

How to Use the Converter

Enter the Value

Type your acreage into the left field of the converter card. Decimal values such as 12.5 work fine.

Read the Result

The hectare equivalent appears instantly in the right field as you type.

Copy or Swap

Use the copy button to grab the result, or press the swap button to convert hectares back to acres.

Quick mental math: multiply acres by 0.4 (or divide by 2.5). For 100 acres: 100 × 0.4 = 40 ha; the exact answer is 40.47 ha — close enough for estimates.

Converter Features

Instant Real-Time Conversion

The result updates the moment you type. There is no calculate button, so you can compare several values in seconds.

Bidirectional Swap

Press the swap button between the two fields to reverse the direction instantly, without reloading the page or re-typing.

Searchable Unit Picker

Each unit dropdown has a search box, so you can switch to any other area unit and convert in a different direction whenever you need.

One-Click Copy

A copy button sits beside each field. Tap it to send the value straight to your clipboard for reports, listings, or spreadsheets.

Quick Reference & Unit Info

A built-in quick-reference grid and unit info cards show common values and where each unit is used, right below the converter.

Mobile-Optimized Design

Large touch targets and a responsive layout make conversions easy on a phone, whether on-site, in a store, or on the go.

Reference Values

Acres	Hectares
1 ac	0.4 ha
2.47 ac	1 ha
10 ac	4.05 ha
40 ac	16.2 ha
100 ac	40.5 ha
640 ac	259 ha

Frequently Asked Questions

How do I convert acres to hectares?

Multiply acres by 0.4047, or divide by 2.471. For example, 100 acres × 0.4047 = 40.47 hectares.

Why do international reports require hectares?

The UN Food and Agriculture Organization (FAO) and most scientific journals use the metric system. Hectares allow consistent global comparisons of agricultural productivity.

What's the quick mental math for acres to hectares?

Multiply by 0.4 (or divide by 2.5). For 100 acres: 100 × 0.4 = 40 hectares. The exact answer is 40.47 ha — close enough for estimates.

Do carbon credit programs accept acres?

Most international programs require metric measurements. Convert your acreage to hectares before submitting applications to ensure compliance.

Is this conversion exact?

Yes. The converter uses the precise factor 1 acre = 0.40468564224 hectares, so results are mathematically exact for any level of precision needed.

Acres to Hectares