Acres to Hectares Converter
Convert acres to hectares: 1 ac = 0.404686 ha. Exact factor, formula and a conversion chart.
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Result
- 1 ac
- 0.404686 ha
- 1 ha
- 2.47105 ac
How it's calculated
hectares = acres × 0.404686
To convert ac to ha, divide by 2.47105.
ac in every unit
| square centimetre | 40,468,564 cm² |
| square metre | 4,046.86 m² |
| square kilometre | 0.00404686 km² |
| hectare | 0.404686 ha |
| square inch | 6,272,640 in² |
| square foot | 43,560 ft² |
| square yard | 4,840 yd² |
| square mile | 0.0015625 mi² |
ac to ha conversion chart
| acre (ac) | hectare (ha) |
|---|---|
| 1 ac | 0.404686 ha |
| 2 ac | 0.809371 ha |
| 3 ac | 1.21406 ha |
| 4 ac | 1.61874 ha |
| 5 ac | 2.02343 ha |
| 6 ac | 2.42811 ha |
| 7 ac | 2.8328 ha |
| 8 ac | 3.23749 ha |
| 9 ac | 3.64217 ha |
| 10 ac | 4.04686 ha |
| 12 ac | 4.85623 ha |
| 15 ac | 6.07028 ha |
| 20 ac | 8.09371 ha |
| 25 ac | 10.1171 ha |
| 50 ac | 20.2343 ha |
| 100 ac | 40.4686 ha |
How many hectares are in 1 acre?
1 acre = 0.404686 hectares. To convert acres to hectares, divide by 2.47105. For example, 10 ac = 4.04686 ha and 100 ac = 40.4686 ha. Enter any value above for an exact result.
The Unit Converter changes a value from one unit to another across 11 kinds of measurement: length, weight, temperature, volume, area, speed, time, digital storage, energy, pressure and fuel economy. It covers metric units (centimetres, kilograms, litres), US and UK imperial units (inches, pounds, gallons) and everyday ones such as cups, stones, acres and kilowatt-hours.
Conversions use the official definitions — 1 inch is exactly 2.54 cm, 1 pound exactly 0.45359237 kg, 1 US gallon exactly 3.785411784 litres — and the page shows the factor, the formula, the value in every other unit and a chart of common values, so you can check or reuse the numbers.
When to use it
- Converting height and weight between metric and imperial (cm ↔ feet and inches, kg ↔ lbs).
- Cooking with recipes from another country (cups, tablespoons, ml, grams, ounces).
- Reading weather and oven temperatures in Celsius or Fahrenheit.
- Property sizes in square feet, square metres, acres and hectares.
- File sizes (MB ↔ GB), fuel economy (mpg ↔ L/100 km) and tyre pressure (psi ↔ bar).
Tips for better results
- US and UK gallons and pints differ by about 20% — check which one a recipe or car manual uses.
- Temperature is not a simple multiplication: use the formula shown (°F = °C × 9/5 + 32).
- Storage makers use 1 GB = 1,000 MB, while some operating systems show GiB (1,024 MiB) — both are listed.
How to use the Unit Converter
- Choose the measurement, such as length or temperature.
- Enter the value and pick the units to convert from and to.
- Read the result, the value in every other unit and the conversion chart below.
Frequently asked questions
How do I convert acres to hectares?
To convert acres to hectares, divide by 2.47105. For example, 10 ac = 4.04686 ha.
How do I convert hectares back to acres?
Press the swap button between the units. 1 ha = 2.47105 ac.
Is the conversion exact?
Yes. It uses the official definitions of the units; results are only rounded to six significant digits for display.
Are the conversions exact?
Yes. Units are converted with their defined factors — for example 1 inch is exactly 2.54 cm and 1 pound is exactly 0.45359237 kg — and results are rounded to six significant digits only for display.
Are cups and gallons US or UK?
Cups, pints, quarts and gallons are US customary units unless marked UK. UK (imperial) gallons and pints are listed separately because they are about 20% larger.
How many centimetres are in an inch?
Exactly 2.54 cm. To convert inches to centimetres, multiply by 2.54; to convert centimetres to inches, divide by 2.54.
How do I convert kilograms to pounds?
Multiply by 2.20462 (1 kg = 2.20462 lb). To convert pounds to kilograms, multiply by 0.453592.