Convert Square Rod to Acre
Convert square rods to acres instantly. 1 square rod = 0.00625 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre 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.
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 Rod to Acre conversion formula
The relationship between square rods and acres:
To convert square rods to acres, multiply the value in square rods by 0.00625. To reverse, multiply acres by 160.
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 Rod converter for the reverse direction.
Step-by-step: convert square rods to acres
- Write down the value in square rods (rd²).
- Multiply that value by the factor 0.00625.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 160.
Worked examples
Example 1 — Convert 1 rd² to ac:
1 × 0.00625 = 0.00625 ac
Example 2 — Convert 100 rd² to ac:
100 × 0.00625 = 0.625 ac
Square Rod to Acre conversion table
Standard reference values for converting square rods to acres:
| Square Rod [rd²] | Acre [ac] |
|---|---|
| 0.01 | 6.25e-5 |
| 0.1 | 0.000625 |
| 1 | 0.00625 |
| 2 | 0.0125 |
| 3 | 0.01875 |
| 4 | 0.025 |
| 5 | 0.03125 |
| 10 | 0.0625 |
| 20 | 0.125 |
| 30 | 0.1875 |
| 40 | 0.25 |
| 50 | 0.3125 |
| 100 | 0.625 |
| 500 | 3.125 |
| 1000 | 6.25 |
Frequently asked questions
How many acres is 1 square rod?
How do I convert square rods to acres?
How do I convert acres back to square rods?
How many acres is 100 square rods?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 rd² = 0.00625 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 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.