Convert Square Link to Rood
Convert square links to roods instantly. 1 square link = 4e-5 rood — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Rood to Square Link converter for the reverse conversion.
Units explained
Square Link
A square link is an imperial unit of area equal to approximately 0.0405 m². It is part of the chain-link surveying system used historically for land measurement.
Derived by squaring the link (1/100 of a chain = 7.92 inches). The Gunter's chain was introduced by English mathematician Edmund Gunter in 1620 for land surveying.
Square links appear in historical land surveys and legacy property records, particularly in the US Public Land Survey System (PLSS). Modern surveys use feet or meters instead.
Gunter's chain introduced in 1620; standardized via the 1959 International Yard and Pound Agreement.
Rood
A rood is an imperial unit of area equal to approximately 1011.71 m², or 1/4 of an acre. It was historically used in England and parts of the British Empire.
Defined as one-quarter of an acre; historically used in medieval English farming as the area one ox could plow in a day. The word relates to 'rod' as a measure of length used in plot dimensions.
Roods appear in historical English farming records, parish records, and old property deeds. The unit is functionally obsolete today.
Medieval English farming origin; standardized via the 1959 International Yard and Pound Agreement.
Square Link to Rood conversion formula
The relationship between square links and roods:
To convert square links to roods, multiply the value in square links by 4e-5. To reverse, multiply roods by 25000.000138379.
How to use this converter
Type a value into the calculator. The result in roods updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Rood to Square Link converter for the reverse direction.
Step-by-step: convert square links to roods
- Write down the value in square links (lk²).
- Multiply that value by the factor 4e-5.
- The product is the equivalent value in roods (rood).
- To reverse, multiply the rood value by 25000.000138379.
Worked examples
Example 1 — Convert 1 lk² to rood:
1 × 4e-5 = 4e-5 rood
Example 2 — Convert 100 lk² to rood:
100 × 4e-5 = 0.004 rood
Real-world example — Small to geographic-scale
100,000 square links equals one rood — a useful conversion when small-scale survey diagrams must be related to road-network distances on a different map.
100000 lk² × 4e-5 = 3.9999999779 rood
Real-world example — Architectural to geographic scale
A 100,000-square link measurement equals one rood. The five-order-of-magnitude scale change comes up in mapping work where architectural site plans must be related to road-network maps.
100000 lk² × 4e-5 = 3.9999999779 rood
Square Link to Rood conversion table
Standard reference values for converting square links to roods:
| Square Link [lk²] | Rood [rood] |
|---|---|
| 0.01 | 4e-7 |
| 0.1 | 4e-6 |
| 1 | 4e-5 |
| 2 | 8e-5 |
| 3 | 0.00012 |
| 4 | 0.00016 |
| 5 | 0.0002 |
| 10 | 0.0004 |
| 20 | 0.0008 |
| 30 | 0.0012 |
| 40 | 0.0016 |
| 50 | 0.002 |
| 100 | 0.004 |
| 500 | 0.0199999999 |
| 1000 | 0.0399999998 |
Frequently asked questions
How many roods is 1 square link?
How do I convert square links to roods?
How do I convert roods back to square links?
How many roods is 100 square links?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 lk² = 4e-5 rood) 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.