How many acres in 1 ha?
1 ha = 2.471053815 ac. The other way round: 1 ac = 0.4046856422 ha. A hectare is 10,000 m², a square of 100 × 100 m, and the standard unit for farmland in metric countries. An international acre is 4,046.8564224 m² (about 0.405 ha), originally the land a team of oxen could plough in a day. Land in the US and UK is sold by the acre.
Hectares to acres conversion table
1 ha = 2.4711 ac · 2 ha = 4.9421 ac · 3 ha = 7.4132 ac · 4 ha = 9.8842 ac · 5 ha = 12.3553 ac · 6 ha = 14.8263 ac · 7 ha = 17.2974 ac · 8 ha = 19.7684 ac · 9 ha = 22.2395 ac · 10 ha = 24.7105 ac · 12 ha = 29.6526 ac · 15 ha = 37.0658 ac · 20 ha = 49.4211 ac · 25 ha = 61.7763 ac · 30 ha = 74.1316 ac · 40 ha = 98.8422 ac · 50 ha = 123.5527 ac · 75 ha = 185.329 ac · 100 ha = 247.1054 ac · 1,000 ha = 2,471.0538 ac
How to convert hectares to acres
Multiply the value by 2.471053815. Example: 37 ha = 91.429 ac.
Unit Converter
How to use
- 1Pick a category — length, weight, temperature, volume, area, speed, data, time, pressure or energy.
- 2Choose the “from” and “to” units, or press swap to reverse them.
- 3Type a value in either field — the other side updates as you type.
- 4Adjust the decimal precision and check the conversion table for common values.
Exact conversion factors
Many imperial units are defined exactly in metric terms: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km, 1 pound = 0.45359237 kg and 1 US gallon = 3.785411784 litres. The converter uses these definitions, so results are as precise as the decimals you choose to show. The formula is displayed in words — for example “multiply by 2.54” — so you can repeat the calculation by hand.
Temperature is different
Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single factor. °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9; Kelvin is Celsius + 273.15. That is why 0 °C is 32 °F, while a 10-degree change in Celsius is an 18-degree change in Fahrenheit.
US vs UK units and data sizes
A US gallon (3.785 L) is smaller than an imperial UK gallon (4.546 L), and US fluid ounces differ slightly from UK ones — check which system your recipe or spec uses. For data sizes, storage makers use decimal units (1 GB = 1,000 MB), while operating systems often count in binary units (1 GiB = 1,024 MiB), which is why a new drive shows less capacity than the label.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 cm. To convert cm to inches, divide by 2.54.
How do I convert kg to pounds?
Multiply kilograms by about 2.20462. One pound is exactly 0.45359237 kg.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C × 1.8 + 32 = 68 °F.
Can I convert in both directions?
Yes. Type in either field and the other updates, or press swap to switch the units.
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