Convert Square Chain to Hectare
Convert square chains to hectares instantly. 1 square chain = 0.0404685642 hectare — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectare to Square Chain converter for the reverse conversion.
Units explained
Square Chain
A square chain is an imperial unit of area equal to approximately 404.686 m². It equals 1/10 of an acre.
Derived by squaring the chain (66 feet or 22 yards). The chain was defined by Edmund Gunter in 1620 specifically so that 10 square chains equal exactly one acre.
Square chains appear in US Public Land Survey System (PLSS) records and historical English property documents. The 10-to-1 ratio with acres made early survey arithmetic easier.
Defined by Edmund Gunter in 1620 specifically for surveying convenience.
Hectare
A hectare is a metric unit of area equal to 10,000 square meters, or one square hectometer. It is the most widely used metric unit for land measurement worldwide.
Defined as 100 ares, equal to one square hectometer. The name was introduced in 1795 in France as part of the metric system.
Hectares are the standard unit for agricultural land measurement worldwide except in the US (which uses acres). 1 hectare equals 2.47105 acres. In India, hectares are used in modern agricultural census and land records alongside traditional regional units.
Adopted in France in 1795; standardized internationally through the SI system.
Square Chain to Hectare conversion formula
The relationship between square chains and hectares:
To convert square chains to hectares, multiply the value in square chains by 0.0404685642. To reverse, multiply hectares by 24.7105381492.
How to use this converter
Type a value into the calculator. The result in hectares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Hectare to Square Chain converter for the reverse direction.
Step-by-step: convert square chains to hectares
- Write down the value in square chains (ch²).
- Multiply that value by the factor 0.0404685642.
- The product is the equivalent value in hectares (ha).
- To reverse, multiply the hectare value by 24.7105381492.
Worked examples
Example 1 — Convert 1 ch² to ha:
1 × 0.0404685642 = 0.0404685642 ha
Example 2 — Convert 100 ch² to ha:
100 × 0.0404685642 = 4.046856422 ha
Square Chain to Hectare conversion table
Standard reference values for converting square chains to hectares:
| Square Chain [ch²] | Hectare [ha] |
|---|---|
| 0.01 | 0.0004046856 |
| 0.1 | 0.0040468564 |
| 1 | 0.0404685642 |
| 2 | 0.0809371284 |
| 3 | 0.1214056927 |
| 4 | 0.1618742569 |
| 5 | 0.2023428211 |
| 10 | 0.4046856422 |
| 20 | 0.8093712844 |
| 30 | 1.2140569266 |
| 40 | 1.6187425688 |
| 50 | 2.023428211 |
| 100 | 4.046856422 |
| 500 | 20.23428211 |
| 1000 | 40.46856422 |
Frequently asked questions
How many hectares is 1 square chain?
How do I convert square chains to hectares?
How do I convert hectares back to square chains?
How many hectares is 100 square chains?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 ch² = 0.0404685642 ha) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.