Convert Square Rod to Square Chain
Convert square rods to square chains instantly. 1 square rod = 0.0625 square chain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Chain to Square Rod converter for the reverse conversion.
Units explained
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
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 to Square Chain conversion formula
The relationship between square rods and square chains:
To convert square rods to square chains, multiply the value in square rods by 0.0625. To reverse, multiply square chains by 15.9999999984.
How to use this converter
Type a value into the calculator. The result in square chains 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 Chain to Square Rod converter for the reverse direction.
Step-by-step: convert square rods to square chains
- Write down the value in square rods (rd²).
- Multiply that value by the factor 0.0625.
- The product is the equivalent value in square chains (ch²).
- To reverse, multiply the square chain value by 15.9999999984.
Worked examples
Example 1 — Convert 1 rd² to ch²:
1 × 0.0625 = 0.0625 ch²
Example 2 — Convert 100 rd² to ch²:
100 × 0.0625 = 6.2500000006 ch²
Square Rod to Square Chain conversion table
Standard reference values for converting square rods to square chains:
| Square Rod [rd²] | Square Chain [ch²] |
|---|---|
| 0.01 | 0.000625 |
| 0.1 | 0.00625 |
| 1 | 0.0625 |
| 2 | 0.125 |
| 3 | 0.1875 |
| 4 | 0.25 |
| 5 | 0.3125 |
| 10 | 0.6250000001 |
| 20 | 1.2500000001 |
| 30 | 1.8750000002 |
| 40 | 2.5000000002 |
| 50 | 3.1250000003 |
| 100 | 6.2500000006 |
| 500 | 31.2500000031 |
| 1000 | 62.5000000062 |
Frequently asked questions
How many square chains is 1 square rod?
How do I convert square rods to square chains?
How do I convert square chains back to square rods?
How many square chains is 100 square rods?
Popular area unit conversions
Convert Square Rod to other area units
Show all Square Rod conversions
Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 rd² = 0.0625 ch²) 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.