Convert Square Chain to Acre
Convert square chains to acres instantly. 1 square chain = 0.1 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre 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.
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Square Chain to Acre conversion formula
The relationship between square chains and acres:
To convert square chains to acres, multiply the value in square chains by 0.1. To reverse, multiply acres by 10.000000001.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Square Chain converter for the reverse direction.
Step-by-step: convert square chains to acres
- Write down the value in square chains (ch²).
- Multiply that value by the factor 0.1.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 10.000000001.
Worked examples
Example 1 — Convert 1 ch² to ac:
1 × 0.1 = 0.1 ac
Example 2 — Convert 100 ch² to ac:
100 × 0.1 = 9.999999999 ac
Square Chain to Acre conversion table
Standard reference values for converting square chains to acres:
| Square Chain [ch²] | Acre [ac] |
|---|---|
| 0.01 | 0.001 |
| 0.1 | 0.01 |
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 4 | 0.4 |
| 5 | 0.5 |
| 10 | 0.9999999999 |
| 20 | 1.9999999998 |
| 30 | 2.9999999997 |
| 40 | 3.9999999996 |
| 50 | 4.9999999995 |
| 100 | 9.999999999 |
| 500 | 49.9999999951 |
| 1000 | 99.9999999901 |
Frequently asked questions
How many acres is 1 square chain?
How do I convert square chains to acres?
How do I convert acres back to square chains?
How many acres 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 = 0.1 ac) 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.