Convert Acres to Hectares
Instantly convert Acres (ac) to Hectares (ha) with our free online calculator.
Formula: ac to ha — multiply by 0.404686
Reference Table
| Acres (ac) | Hectares (ha) |
|---|---|
| 1 | 0.404686 |
| 5 | 2.02343 |
| 10 | 4.04686 |
| 25 | 10.1171 |
| 50 | 20.2343 |
| 100 | 40.4686 |
How to Convert Acres to Hectares
Formula
To convert Acres (ac) to Hectares (ha): multiply by 0.404686
Step-by-Step
- Start with your value in Acres (ac).
- Multiply by 0.404686 to perform the conversion.
- The result is your value expressed in Hectares (ha).
Conversion Factor
1 ac = 0.404686 ha
Reverse Factor
1 ha = 2.47105 ac
Worked Example
Convert 25 Acres to Hectares: 25 ac = 10.1171 ha
About Acre (ac)
An imperial unit of land area equal to exactly 43,560 ft² = 4,046.8564224 m² per NIST SP 811 — derived historically as the area one ox-team could plow in a day (one chain × one furlong = 66 ft × 660 ft = 43,560 ft²). The acre remains the standard US and UK working unit for: agricultural land (US Department of Agriculture quotes farm sizes, crop yields, USDA NRCS conservation programs all in acres; average US farm 446 acres per 2022 Census of Agriculture; total US farmland 893 million acres); rural and ex-urban real-estate transactions (parcels above ~½ acre listed in acres rather than ft²); forestry and timber-harvest reporting (US Forest Service, Bureau of Land Management, USDA APHIS Forest Health all use acres); ranch and farm sales documentation per RLI — Realtors Land Institute standards; zoning ordinances (residential R-1 typical 1/4 to 1 acre minimum lot; agricultural A-1 5-40 acres minimum); golf-course dimensions (typical 18-hole course 100-200 acres); MLB outfield dimensions; FAA airport-zoning. Reference: a US football field (with end zones) = 1.32 acres; Central Park NYC = 843 acres; Pentagon building grounds = 583 acres. Convert acres to hectares by multiplying by 0.4047; to m² by multiplying by 4,046.86.
About Hectare (ha)
A metric unit of area equal to exactly 10,000 m² (= 100 m × 100 m square = 2.47105 acres). The hectare is the international working unit for: agricultural land per FAO Statistics Division (typical European family farm 30-100 ha; Canadian prairie wheat operation 500-5,000 ha; Australian station/ranch 50,000-1,000,000 ha; Brazilian soy farm 1,000-50,000 ha; world's largest cattle ranch 9.1 million ha — Anna Creek Station, Australia); forestry and protected-area management (the Amazon biome covers ~550 million ha; Russian forests ~815 million ha; FSC and PEFC forest-certification reporting); national parks worldwide except US (Banff National Park 664,100 ha; Serengeti 1,476,300 ha; Galápagos National Park 798,500 ha); FAO World Programme for the Census of Agriculture per UNFAO methodology — all global crop-yield, livestock-density, and food-security statistics reported per ha. Hectares are also used for vineyard sizes (Bordeaux AOC 110,000 ha total; Napa Valley AVA 18,000 ha), olive groves, palm-oil plantations, and rice-paddy area in Southeast Asia. A convenient human-scale unit between m² (too small for farms) and km² (too large for individual parcels). Convert ha to acres by multiplying by 2.471; to km² by dividing by 100.
Quick Facts
- 1 Acre equals 0.404686 Hectares
- 1 Hectare equals 2.47105 Acres
- Acre is a unit of area
- Hectare is a unit of area
- This conversion is commonly used in real estate, agriculture, landscaping, and urban planning
- The Acre belongs to the imperial system
- The Hectare belongs to the metric system
Common Acre to Hectare Conversions
| Acres (ac) | Hectares (ha) |
|---|---|
| 0.01 | 0.00404686 |
| 0.1 | 0.0404686 |
| 0.25 | 0.101171 |
| 0.5 | 0.202343 |
| 1 | 0.404686 |
| 2 | 0.809371 |
| 3 | 1.21406 |
| 5 | 2.02343 |
| 10 | 4.04686 |
| 15 | 6.07028 |
| 20 | 8.09371 |
| 25 | 10.1171 |
| 50 | 20.2343 |
| 75 | 30.3514 |
| 100 | 40.4686 |
| 250 | 101.171 |
| 500 | 202.343 |
| 1000 | 404.686 |
| 5000 | 2023.43 |
| 10000 | 4046.86 |
Understanding Acres
The Acre (symbol: ac) is a unit of area. An imperial unit of land area equal to exactly 43,560 ft² = 4,046.8564224 m² per NIST SP 811 — derived historically as the area one ox-team could plow in a day (one chain × one furlong = 66 ft × 660 ft = 43,560 ft²). The acre remains the standard US and UK working unit for: agricultural land (US Department of Agriculture quotes farm sizes, crop yields, USDA NRCS conservation programs all in acres; average US farm 446 acres per 2022 Census of Agriculture; total US farmland 893 million acres); rural and ex-urban real-estate transactions (parcels above ~½ acre listed in acres rather than ft²); forestry and timber-harvest reporting (US Forest Service, Bureau of Land Management, USDA APHIS Forest Health all use acres); ranch and farm sales documentation per RLI — Realtors Land Institute standards; zoning ordinances (residential R-1 typical 1/4 to 1 acre minimum lot; agricultural A-1 5-40 acres minimum); golf-course dimensions (typical 18-hole course 100-200 acres); MLB outfield dimensions; FAA airport-zoning. Reference: a US football field (with end zones) = 1.32 acres; Central Park NYC = 843 acres; Pentagon building grounds = 583 acres. Convert acres to hectares by multiplying by 0.4047; to m² by multiplying by 4,046.86.
It belongs to the imperial measurement system.
Acres are commonly used in real estate, agriculture, landscaping, and urban planning.
Understanding Hectares
The Hectare (symbol: ha) is a unit of area. A metric unit of area equal to exactly 10,000 m² (= 100 m × 100 m square = 2.47105 acres). The hectare is the international working unit for: agricultural land per FAO Statistics Division (typical European family farm 30-100 ha; Canadian prairie wheat operation 500-5,000 ha; Australian station/ranch 50,000-1,000,000 ha; Brazilian soy farm 1,000-50,000 ha; world's largest cattle ranch 9.1 million ha — Anna Creek Station, Australia); forestry and protected-area management (the Amazon biome covers ~550 million ha; Russian forests ~815 million ha; FSC and PEFC forest-certification reporting); national parks worldwide except US (Banff National Park 664,100 ha; Serengeti 1,476,300 ha; Galápagos National Park 798,500 ha); FAO World Programme for the Census of Agriculture per UNFAO methodology — all global crop-yield, livestock-density, and food-security statistics reported per ha. Hectares are also used for vineyard sizes (Bordeaux AOC 110,000 ha total; Napa Valley AVA 18,000 ha), olive groves, palm-oil plantations, and rice-paddy area in Southeast Asia. A convenient human-scale unit between m² (too small for farms) and km² (too large for individual parcels). Convert ha to acres by multiplying by 2.471; to km² by dividing by 100.
It belongs to the metric measurement system.
Hectares are commonly used in real estate, agriculture, landscaping, and urban planning.
Why Convert Acres to Hectares?
Converting between Acres and Hectares is a frequent requirement for engineers, scientists, and students working with area values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate area conversion is essential.
Frequently Asked Questions
How do I convert Acres to Hectares?
An imperial unit of land area equal to exactly 43,560 ft² = 4,046. To convert Acres to Hectares, multiply by 0.404686. For example, 25 ac equals 10.1171 ha.
How many Hectares are in 1 Acre?
There are 0.404686 Hectares in 1 Acre.
How many Acres are in 1 Hectare?
There are 2.47105 Acres in 1 Hectare.
What is the formula for Acre to Hectare conversion?
The formula is: multiply by 0.404686. This means 1 ac = 0.404686 ha.
Is a Acre bigger than a Hectare?
Yes. One Acre is larger than one Hectare because 1 ac equals 0.404686 ha, which is less than 1.
When do you need to convert between Acres and Hectares?
A metric unit of area equal to exactly 10,000 m² (= 100 m × 100 m square = 2. Acre and Hectare are both area units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.