Convert Rood to Square Mil
Convert roods to square mils instantly. 1 rood = 1.56816e+12 square mil — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Mil to Rood converter for the reverse conversion.
Units explained
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 Mil
A square mil is an imperial unit of area equal to 6.4516×10⁻¹⁰ m². It is widely used in printed circuit board (PCB) design and electronics manufacturing.
Derived by squaring the mil (1 mil = 1/1000 of an inch = 0.0254 mm). Standardized via the 1959 International Yard and Pound Agreement.
Square mils are the standard unit for PCB trace cross-sections, pad areas, and component pitches in US-localized electronic design software and datasheets.
Standardized via the 1959 International Yard and Pound Agreement.
Rood to Square Mil conversion formula
The relationship between roods and square mils:
To convert roods to square mils, multiply the value in roods by 1.56816e+12. To reverse, multiply square mils by 6.3769e-13.
How to use this converter
Type a value into the calculator. The result in square mils 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 Mil to Rood converter for the reverse direction.
Step-by-step: convert roods to square mils
- Write down the value in roods (rood).
- Multiply that value by the factor 1.56816e+12.
- The product is the equivalent value in square mils (mil²).
- To reverse, multiply the square mil value by 6.3769e-13.
Worked examples
Example 1 — Convert 1 rood to mil²:
1 × 1.56816e+12 = 1.56816e+12 mil²
Example 2 — Convert 100 rood to mil²:
100 × 1.56816e+12 = 1.56816e+14 mil²
Real-world example — Kilometres to wavelengths
One rood equals one trillion square mils — a conversion physics teachers use to convey the gulf between everyday geographic and atomic scales.
1 rood × 1.56816e+12 = 1.56816e+12 mil²
Real-world example — Geographic to wavelength scale
One rood equals one trillion square mils — illustrating the 12-order-of-magnitude span between geographic distance and atomic-feature scales.
1 rood × 1.56816e+12 = 1.56816e+12 mil²
Rood to Square Mil conversion table
Standard reference values for converting roods to square mils:
| Rood [rood] | Square Mil [mil²] |
|---|---|
| 0.01 | 1.56816e+10 |
| 0.1 | 1.56816e+11 |
| 1 | 1.56816e+12 |
| 2 | 3.13632e+12 |
| 3 | 4.70448e+12 |
| 4 | 6.27264e+12 |
| 5 | 7.8408e+12 |
| 10 | 1.56816e+13 |
| 20 | 3.13632e+13 |
| 30 | 4.70448e+13 |
| 40 | 6.27264e+13 |
| 50 | 7.8408e+13 |
| 100 | 1.56816e+14 |
| 500 | 7.8408e+14 |
| 1000 | 1.56816e+15 |
Frequently asked questions
How many square mils is 1 rood?
How do I convert roods to square mils?
How do I convert square mils back to roods?
How many square mils is 100 roods?
Popular area unit conversions
Convert Rood to other area units
Show all Rood conversions
Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 rood = 1.56816e+12 mil²) 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.