Acres to Hectares Converter

Convert acres to hectares (ac to ha)

To convert acres to hectares, multiply the value in acres by 0.40468564224. Farmers, land buyers and conservation groups use it to compare plots, farms and forests across countries. This acres to hectares converter works both ways: type acres or hectares into either box above and the other box, the worked formula and the chart below update as you type.

The acre (ac) is a unit of land equal to 43,560 square feet, or exactly 4,046.8564224 m². It began as the area a team of oxen could plough in a day and was later fixed as one furlong by one chain. Acres are used for land and farm sizes in the US, UK, India, Canada and Australia. One acre is 0.404686 hectares.

The hectare (ha) is a metric unit of area equal to 10,000 m² — a square 100 meters on each side. A full-size football pitch covers roughly 0.7 ha. Going the other way, one hectare equals 2.47105 acres. Hectares are the standard unit for farmland, forests and land-use statistics in most countries.

How to convert acres to hectares with this tool

1. Type a number into the Acres (ac) box — it starts at 1 ac as an example.
2. Read the answer in the Hectares (ha) box and in the result panel, which also shows the formula with your number.
3. To go the other way, type into the hectares box, or press the swap button to open the Hectares to Acres converter with your value carried over.
4. Choose how many decimal places you want, or tap a quick value such as 0.25 ac, 0.5 ac, 5 ac.
5. Press Copy result to paste the conversion into a message, spreadsheet or note.

Acres to Hectares converter features

Acres to Hectares formula

The formula is ha = ac × 0.40468564224. It is exact because an international acre is exactly 4,046.8564224 m² and a hectare is 10,000 m².

The reverse formula is ac = ha ÷ 0.40468564224 — or use the Hectares to Acres converter. Three worked examples:

• One acre: 1 ac × 0.40468564224 = 0.4047 ha
• A 40-acre plot: 40 ac × 0.40468564224 = 16.1874 ha
• A square mile (640 acres): 640 ac × 0.40468564224 = 258.9988 ha

Acres to Hectares quick reference

The values people look up most often, worked out with the exact factor:

• 1 ac = 0.404686 ha
• 1 ha = 2.47105 ac
• 0.25 ac = 0.1012 ha
• 0.5 ac = 0.2023 ha
• 5 ac = 2.0234 ha
• 10 ac = 4.0469 ha

Quick tip: Multiply by 0.4 for a quick figure (about 1% low): 50 acres ≈ 20 ha, versus the exact 20.2343 ha.

Related conversions: Acres to Square Feet, Square Feet to Acres and the full area converter.

Acres to Hectares conversion table

Values in hectares are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.