Hectare to Acre

Convert hectares to acres quickly and accurately with our easy-to-use area converter.

ha
— ac

Common Conversions

Click any preset to calculate immediately.

Hectare to Acre — Conversion Flow

1 Hectare (ha) 10,000 m²
× 2.47105381
2.47105 Acre (ac) 24,710.54 ft²
ha

Hectare vs Acre — Visual Size Comparison

100 m × 100 m
10,000 m² 100 m 100 m
1 hectare = 2.47105381 ac
63.61 m
4,046.86 m² 63.61 m 63.61 m
2.47105 acres = 0.40468564 ha

Squares are drawn to relative scale. Hover or tap for dimensions.

Hectare (ha) ha

A hectare (ha) is a metric land area unit accepted by the International System of Units (SI) and defined as exactly 10,000 square meters (m²), or 107,639.10 square feet (ft²). One hectare forms a square measuring 100 meters (328.08 ft) on each side. The Food and Agriculture Organization (FAO) and the European Union (EU) use the hectare as the standard unit for reporting crop area, forest coverage, and land registry records across 190+ member nations.

Acres (ac)
2.47105381 ac
Square meters (m²)
10,000 m²
Square feet (ft²)
107,639.10 ft²
Square yards (yd²)
11,959.90 yd²
Ares (a)
100 a
Square kilometers (km²)
0.01 km²
Acre (ac) ac

An acre (ac) is a land area unit in the Imperial System and the United States Customary System, defined by the National Institute of Standards and Technology (NIST) as exactly 4,046.8564224 m² (43,560 ft² or 4,840 sq yd). The traditional acre shape measures 1 chain (66 ft / 20.12 m) by 1 furlong (660 ft / 201.17 m). The United States Department of Agriculture (USDA) and HM Land Registry in the United Kingdom use the acre for farm real estate values and property deeds.

Hectares (ha)
0.40468564 ha
Square meters (m²)
4,046.8564224 m²
Square feet (ft²)
43,560 ft²
Square yards (yd²)
4,840 yd²
Square chains (ch²)
10 ch²
Square miles (mi²)
0.0015625 mi²

How to Convert Hectares to Acres Quickly and Accurately

Try the 4 steps with a live example

01

Enter the hectare value

Type the full figure with all decimals — 0.809 ha, 1.46 ha, 2.023 ha, or 0.23 ha all work directly in the hectare to acre calculator.

Input → 2.5 ha

Precision Impact — How Rounding the Factor Changes the Result

Enter a parcel size to see how much area each rounded factor misses.

ha
× 2.47105381 247.10538 ac
Error: 0 m²
× 2.4711 247.11000 ac
Error: 1.9 m²
× 2.471 247.10000 ac
Error: 21.8 m²
× 2.47 247.00000 ac
Error: 426.6 m²
× 2.5 250.00000 ac
Error: 11,710 m²

4 steps for an accurate hectare to acre conversion

  1. 01

    Enter the hectare value

    • Type the full figure with all decimals — 0.809 ha, 1.46 ha, 2.023 ha, or 0.23 ha all work directly in the hectare to acre calculator.
    • Decimal hectares require no pre-rounding before the multiplication step. A value of 0.0700 ha converts the same way as 70 ha.
    • Confirm the unit label before entering: 2.5 ha and 2.5 ares (a) differ by a factor of 100, because 1 hectare equals 100 ares.
  2. 02

    Multiply by 2.47105381

    • The hectare to acre conversion factor of 2.47105381 (derived from 10,000 m² ÷ 4,046.8564224 m²) stays identical for every parcel size.
    • A 0.4 ha (4,000 m² / 43,055.64 ft²) urban plot and a 4,000 ha (40 km² / 15.44 mi²) rural estate both use the same single multiplication.
    • Divide by 2.47105381 only when the starting value is already in acres and needs conversion to hectares.
  3. 03

    Carry at least 5 decimal places

    • Holding 5 or more decimal digits keeps the hectare to acre conversion error below 0.00001 ac on parcels up to 1,000 ha (2,471.05 ac / 10 km²).
    • Cutting the factor to 2.47 drops 0.10538 acre from every 100 hectares — a gap of 426.6 m² (4,593.0 ft² / 510.3 yd²) of land area.
    • Spreadsheet applications and Geographic Information System (GIS) software store the full-precision factor by default. Avoid pasting a shortened copy into formula cells.
  4. 04

    Round the acre result once

    • Round the final acre answer only — never the input hectare value or the conversion factor itself.
    • Property deeds and land title units take 2 decimal places, survey plats and soil survey metrics take 3 places, and crop yield records take 1 place.
    • Rounding the factor early pushes the error through every multiplication. A factor of 2.47 instead of 2.47105381 on a 250 ha parcel produces an error of 0.26345 ac (1,066.5 m² / 11,480.0 ft²).

3 hectare to acre conversion methods ranked by precision

Exact

Full factor multiplication

Acres = Hectares × 2.47105381
  • Returns the precise hectare to acre value to 8 decimal places, matching the accuracy required by the National Institute of Standards and Technology (NIST).
  • Use this method for property deeds, land registry filings, farmland valuation units, and any document that carries a monetary price per acre.
  • Works identically on a 0.07 ha (700 m² / 7,534.74 ft²) residential plot and a 10,000 ha (100 km²) forestry land unit.

5 ha × 2.47105381 = 12.35526907 ac

Fast

Field estimate method

Acres ≈ (Hectares × 2.5) − 1.16 %
  • Multiply the hectare figure by 2.5 for a quick mental estimate suitable for pasture size conversion and rural land measurement in the field.
  • Subtract 1.16 % from that intermediate result to close the gap between 2.5 and the exact acreage conversion factor of 2.47105381.
  • The estimate lands within 0.0002 acre (0.81 m² / 8.72 ft²) per hectare of the exact figure — acceptable for informal agricultural plot sizing.

8 ha × 2.5 = 20 → 20 − 1.16 % ≈ 19.768 ac (exact: 19.76843 ac)

Geodetic

Square-meter route

Acres = (Hectares × 10,000) ÷ 4,046.8564224
  • Converts through square meters (m²) instead of applying a single hectare to acre factor directly.
  • Matches the workflow used by GPS area measurement apps, Global Navigation Satellite System (GNSS) receivers, and Geographic Information System (GIS) platforms that store parcel geometry in m².
  • Use this method when source data arrives in m² or when geodetic area units from satellite imagery need conversion to acres for deed area translation.

2 ha → 20,000 m² ÷ 4,046.8564224 = 4.94210763 ac

Live Formula Sandbox

Exact

12.35526907 ac

Fast

12.35500000 ac

GIS

12.35526907 ac

Hectare vs Acre: Key Differences

Timeline — How the Hectare and Acre Were Defined

Tap any event to read the full story. Green markers are metric milestones; orange markers are imperial milestones.

1305 English Acre Standardized

Statute of Edward I fixes the acre at 4 rods × 40 rods (66 ft × 660 ft), producing 43,560 ft² (4,046.86 m²).

Tap to read more ↓
1795 France Adopts the Are

The French Republic introduces the are (100 m²) as a metric land unit. The hectare (100 ares = 10,000 m²) follows as the standard agricultural plot size.

Tap to read more ↓
1875 Metre Convention Signed

17 nations sign the Treaty of the Metre in Paris, establishing the International Bureau of Weights and Measures (BIPM).

Tap to read more ↓
1960 SI System Codified

The International System of Units (SI) formally codifies the meter-based measurement system. The hectare is accepted as a non-SI unit for use with SI.

Tap to read more ↓
1959 International Yard Agreement

The US, UK, Canada, Australia, New Zealand, and South Africa define the international yard as exactly 0.9144 m, fixing the international acre at 4,046.8564224 m².

Tap to read more ↓
2023 US Survey Foot Retired

The United States retires the US survey foot and US survey acre (4,046.87261 m²). The international acre (4,046.8564224 m²) becomes the sole US standard.

Tap to read more ↓

5 key differences between the hectare and the acre

Measurement system

  • The **hectare** belongs to the metric system accepted by the International System of Units (SI). It forms the foundation of international land reporting by the Food and Agriculture Organization (FAO) and the European Union (EU).
  • The **acre** belongs to the Imperial System and United States Customary System, governed by the National Institute of Standards and Technology (NIST) and used across the United States, United Kingdom, Canada, and Australia.

Exact size comparison

  • **1 hectare = 10,000 m²** (107,639.10 ft² / 11,959.90 yd² / 0.01 km² / 100 ares).
  • **1 acre = 4,046.8564224 m²** (43,560 ft² / 4,840 yd² / 10 sq chains / 0.0015625 mi²).
  • One hectare is exactly **2.47105381 times larger** than one acre (147.11 % bigger).

Historical origin

  • The hectare was created in Revolutionary France (1795) as part of the decimal metric system, derived from the are (100 m²). The Treaty of the Metre (1875) established international metric standards overseen by the International Bureau of Weights and Measures (BIPM).
  • The acre originated in medieval England as the amount of land a yoke of oxen could plow in one day — standardized in 1305 under King Edward I as a statutory parcel 40 rods long by 4 rods wide.

Geographic usage

  • **Hectares:** Standard land registry unit in continental Europe (France, Germany, Spain, Italy), Latin America (Brazil, Mexico, Argentina), Asia (China, Japan), Africa, and Australia.
  • **Acres:** Primary unit in the United States (USDA farm reports), United Kingdom (HM Land Registry property deeds), Canada, Australia (rural real estate), and traditional land registries in India.

Calculation base

  • **Hectares:** Decimal base — 1 ha = 100 ares = 10,000 m² = 0.01 km². Scaling by powers of 10 makes boundary area conversions straightforward in metric cadastral maps.
  • **Acres:** Duodecimal/Imperial base — 1 ac = 43,560 ft² = 4,840 yd² = 1/640 mi² = 10 sq chains = 160 sq rods. Scaling requires fractional arithmetic for subdivision calculations.

Hectare vs Acre — Technical Comparison

Attribute Hectare (ha) Acre (ac)
System of measurement Metric (SI accepted) Imperial / US Customary
Area in square meters (m²) 10,000 m² 4,046.8564224 m²
Area in square feet (ft²) 107,639.10 ft² 43,560 ft²
Area in square yards (yd²) 11,959.90 yd² 4,840 yd²
Equivalent in other unit 2.47105381 ac 0.40468564 ha
Base dimensions (square) 100 m × 100 m 63.61 m × 63.61 m (208.71 ft)
Governing standard body BIPM / ISO 80000-3 NIST SP 811 / BS 350

Hectare to Acre Conversion Tables

Scale Explorer — Slide to Convert Any Hectare Value

0.01 ha 10,000 ha
ha
Acres (ac)

24.71054

m²

100,000

ft²

1,076,391

km²

0.1000

Area Visualizer — How Many Football Fields?

1 field ≈ 0.714 ha (1.76 ac / 7,140 m²)

7.0 football fields | 12.36 acres
= 1 football field (0.714 ha / 1.76 ac) = partial field

Hectare to acre conversion chart

Select any row to load that hectare value into the hectare to acre calculator at the top of the page.

Small parcels under 1 hectare

12 values
Hectares (ha) Acres (ac) m²
0.07 ha 0.17297377 700
0.1 ha 0.24710538 1,000
0.12 ha 0.29652646 1,200
0.2 ha 0.49421076 2,000
0.23 ha 0.56834238 2,300
0.25 ha 0.61776345 2,500
0.4 ha 0.98842153 4,000
0.5 ha 1.23552691 5,000
0.75 ha 1.85329036 7,500
0.8 ha 1.97684305 8,000
0.809 ha 1.99908254 8,090
0.9 ha 2.22394843 9,000

Parcels from 1 to 10,000 hectares

23 values
Hectares (ha) Acres (ac) km²
1 ha 2.47105381 0.0100
1.2 ha 2.96526458 0.0120
1.25 ha 3.08881727 0.0125
1.46 ha 3.60773857 0.0146
1.5 ha 3.70658072 0.0150
2 ha 4.94210763 0.0200
2.023 ha 4.99894187 0.0202
2.47 ha 6.10350292 0.0247
2.49 ha 6.15292400 0.0249
2.5 ha 6.17763454 0.0250
2.6 ha 6.42473992 0.0260
2.95 ha 7.28960875 0.0295
3 ha 7.41316144 0.0300
4 ha 9.88421526 0.0400
5 ha 12.35526907 0.0500
10 ha 24.71053815 0.1000
20 ha 49.42107629 0.2000
50 ha 123.55269073 0.5000
100 ha 247.10538147 1.0000
250 ha 617.76345367 2.5000
500 ha 1,235.52690734 5.0000
1,000 ha 2,471.05381 10
10,000 ha 24,710.53815 100

FAQs

How many acres are in one hectare?

One hectare equals exactly 2.47105381 international acres (or approximately 2.47 acres).

What is the formula for converting hectares to acres?

The formula is Acres = Hectares × 2.47105381 (or Hectares = Acres × 0.40468564 for reverse conversion).

How do I convert 2 hectares to acres?

Multiply 2 by 2.47105381 to get exactly 4.94210763 acres (approximately 4.94 acres).

How do I convert 5 hectares to acres?

Multiply 5 by 2.47105381 to get exactly 12.35526907 acres (approximately 12.36 acres).

Can I convert decimal hectares into acres?

Yes, multiply any decimal hectare value by 2.47105381 (for example, 0.5 ha = 1.23552691 acres).

What is the difference between hectares and acres?

A hectare is a metric unit of 10,000 m², while an acre is an imperial unit of 4,046.8564224 m² (1 ha ≈ 2.471 acres).

Where are acres commonly used for measuring land?

Acres are primarily used in the United States, United Kingdom, Canada, Australia, and India, while most other countries use hectares.

Can I convert hectares to acres manually?

Yes, multiply hectares by 2.47105381 on paper, or multiply by 2.5 and subtract 1.16% for a quick mental estimate.

Can I use hectare-to-acre conversion for property measurements?

Yes, using the exact 2.47105381 factor ensures accurate translation between metric and imperial deed boundaries.

How can I avoid rounding errors when converting hectares to acres?

Use the full 2.47105381 conversion factor during calculations and only round the final acre result.