Acres to Hectares Converter

Type a number of acres and this converter shows the answer in hectares instantly (1 ac = 0.404686 ha). Below the converter you will find a ready-made ac to ha table, and further down the formula with a worked example.

Land in the United States, the UK, India, Pakistan and Australia is often bought and sold in acres, while farm statistics, EU subsidies and most of the world use hectares. Farmers, surveyors and property buyers convert between them to compare plots: a 40-acre farm is 16.2 ha, a 1-acre house lot is 0.405 ha and a 640-acre section is 259 ha.

How to use the Acres to Hectares tool

1. Enter the value in acres in the Value box. Decimals such as 5.5 are fine.
2. The result in hectares appears straight away, rounded to six significant digits.
3. Check the formula line under the result to see exactly how it was calculated.
4. Press ⇄ to convert hectares back to acres, or pick any other unit from the lists.
5. Use Copy result, or look up common values in the conversion table.

Why use ToolOrca Acres to Hectares

• Exact factor: 1 ac = 0.404686 ha
• Conversion table: ac to ha
• Formula and worked example included
• Instant result as you type
• Converts to every other area unit too
• Free, private and works offline

How to convert acres to hectares

One international acre is 43,560 square feet, which is exactly 4,046.8564224 square meters. A hectare is exactly 10,000 square meters, a square 100 m on each side. So 1 ac = 0.404685642 ha, and 1 ha = 2.47105381 ac.

To convert acres to hectares, multiply the number of acres by 0.40468564.

Worked example: 10 ac × 0.40468564 = 4.04686 ha.

Quick mental math for ac to ha

Divide by 2.5, or multiply by 0.4: 100 acres × 0.4 = 40 ha (exact 40.47 ha). In reverse, one hectare is about 2.5 acres.

Need the opposite direction? Use the hectares to acres converter, or switch units with the ⇄ button above.