Convert Square Chain to Square Rod
Convert square chains to square rods instantly. 1 square chain = 15.9999999984 square rod — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Rod 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.
Square Rod
A square rod is an imperial unit of area equal to approximately 25.293 m². It is part of the historical English land survey system.
Derived by squaring the rod (16.5 feet or 1/4 chain). The rod, perch, and pole are three names for the same length.
Square rods appear in historical English and American land surveys and legacy property records. The unit is largely obsolete today, surviving mainly in legal descriptions of older land grants.
Standardized via the 1959 International Yard and Pound Agreement.
Square Chain to Square Rod conversion formula
The relationship between square chains and square rods:
To convert square chains to square rods, multiply the value in square chains by 15.9999999984. To reverse, multiply square rods by 0.0625.
How to use this converter
Type a value into the calculator. The result in square rods updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Rod to Square Chain converter for the reverse direction.
Step-by-step: convert square chains to square rods
- Write down the value in square chains (ch²).
- Multiply that value by the factor 15.9999999984.
- The product is the equivalent value in square rods (rd²).
- To reverse, multiply the square rod value by 0.0625.
Worked examples
Example 1 — Convert 1 ch² to rd²:
1 × 15.9999999984 = 15.9999999984 rd²
Example 2 — Convert 100 ch² to rd²:
100 × 15.9999999984 = 1599.9999998419 rd²
Square Chain to Square Rod conversion table
Standard reference values for converting square chains to square rods:
| Square Chain [ch²] | Square Rod [rd²] |
|---|---|
| 0.01 | 0.16 |
| 0.1 | 1.5999999998 |
| 1 | 15.9999999984 |
| 2 | 31.9999999968 |
| 3 | 47.9999999953 |
| 4 | 63.9999999937 |
| 5 | 79.9999999921 |
| 10 | 159.9999999842 |
| 20 | 319.9999999684 |
| 30 | 479.9999999526 |
| 40 | 639.9999999367 |
| 50 | 799.9999999209 |
| 100 | 1599.9999998419 |
| 500 | 7999.9999992093 |
| 1000 | 15999.9999984185 |
Frequently asked questions
How many square rods is 1 square chain?
How do I convert square chains to square rods?
How do I convert square rods back to square chains?
How many square rods 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 = 15.9999999984 rd²) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.