Arcsecond to Mil Converter
Convert arcseconds to mils with our free online angle converter.
Quick Answer
1 Arcsecond = 0.004938 mils
Formula: Arcsecond × conversion factor = Mil
Use the calculator below for instant, accurate conversions.
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All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.
Arcsecond to Mil Calculator
How to Use the Arcsecond to Mil Calculator:
- Enter the value you want to convert in the 'From' field (Arcsecond).
- The converted value in Mil will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Angle category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Arcsecond to Mil: Step-by-Step Guide
Converting Arcsecond to Mil involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
mil = ″ × 0.00493827Example Calculation:
1 ″ = 0.004938 mil
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
Need to convert to other angle units?
View all Angle conversions →What is a Arcsecond and a Mil?
1 arcsecond = 1/60 arcminute = 1/3600 degree ≈ 0.000278° ≈ 0.00000485 radians
Symbol: ″ (double prime) or arcsec
Key conversions:
- 60 arcseconds = 1 arcminute
- 3600 arcseconds = 1 degree
- 1 arcsecond ≈ 4.848 × 10⁻⁶ radians
NATO mil: 1 mil = 1/6400 of a circle ≈ 0.05625 degrees ≈ 0.000982 radians
Alternative definitions:
- NATO/US military: 6400 mils = 360° (standard)
- Soviet/Russian: 6000 mils = 360°
- Swedish: 6300 mils = 360°
- True milliradian: 1000 milliradians = 1 radian (6283.2 mils = 360°)
Key conversions (NATO mil):
- 1 mil ≈ 0.05625 degrees
- 1600 mils = 90 degrees (right angle)
- 3200 mils = 180 degrees
- 6400 mils = 360 degrees (full circle)
Note: The Arcsecond is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Mil belongs to the imperial/US customary system.
Common Uses and Applications: arcseconds vs mils
Explore the typical applications for both Arcsecond (imperial/US) and Mil (imperial/US) to understand their common contexts.
Common Uses for arcseconds
Astronomy: Measuring star positions, planetary motion, stellar parallax, and telescope resolution. Surveying: High-precision land measurements and geodetic surveys. GPS Systems: Coordinate precision (1 arcsecond ≈ 30 meters at equator). Optics: Telescope and microscope angular resolution specifications.
When to Use mils
Military Artillery: Gun laying, indirect fire calculations, ballistic corrections. Sniper Operations: Scope adjustments, windage, elevation corrections for long-range shooting. Rangefinding: Estimating target distance using known target size and angular measurements. Fire Control Systems: Tank gunnery, naval artillery, anti-aircraft targeting.
Additional Unit Information
About Arcsecond (″)
How do I convert arcseconds to degrees?
Formula: Degrees = Arcseconds ÷ 3600
Examples:
- 3600 arcseconds = 1°
- 1800 arcseconds = 0.5°
- 60 arcseconds = 1 arcminute = 0.0167°
- 1 arcsecond ≈ 0.000278°
Arcseconds to Degrees converter →
How do I convert arcseconds to arcminutes?
Formula: Arcminutes = Arcseconds ÷ 60
Examples:
- 60 arcseconds = 1 arcminute
- 120 arcseconds = 2 arcminutes
- 30 arcseconds = 0.5 arcminutes
- 3600 arcseconds = 60 arcminutes = 1°
Arcseconds to Arcminutes converter →
How big is 1 arcsecond on Earth's surface?
At the equator: 1 arcsecond ≈ 30.9 meters ≈ 101 feet
Latitude (north-south): Always ≈ 30.9 m per arcsecond Longitude (east-west): Varies by latitude:
- Equator: 30.9 m
- 45° latitude: 21.9 m
- 60° latitude: 15.5 m
- 80° latitude: 5.4 m
This is why GPS coordinates to arcsecond precision give location within ~30 meters.
What is stellar parallax in arcseconds?
Stellar parallax is the apparent shift in a star's position as Earth orbits the Sun, measured in arcseconds.
Formula: Distance (parsecs) = 1 / Parallax (arcseconds)
Examples:
- Proxima Centauri: 0.768 arcseconds → 1.30 parsecs (4.24 light-years)
- Sirius: 0.379 arcseconds → 2.64 parsecs (8.6 light-years)
- Alpha Centauri A: 0.742 arcseconds → 1.35 parsecs (4.37 light-years)
- Barnard's Star: 0.547 arcseconds → 1.83 parsecs (5.96 light-years)
The parsec (pc) unit was defined as the distance at which 1 AU creates 1 arcsecond parallax.
About Mil (mil)
How do I convert mils to degrees?
Formula (NATO mil): Degrees = Mils × (360/6400) = Mils × 0.05625
Examples:
- 100 mils = 5.625°
- 1600 mils = 90°
- 3200 mils = 180°
- 6400 mils = 360°
- 1 mil ≈ 0.05625°
How do mils work for range estimation?
Fundamental principle: At 1000 meters, 1 mil subtends approximately 1 meter.
Range formula: Range (m) = (Object size in meters × 1000) ÷ Object size in mils
Common target sizes:
- Adult human: ~1.7m tall
- Doorway: ~2m tall
- Car: ~4m long, ~1.5m tall
- Tank: ~3m wide, ~2.5m tall
- Shipping container: ~12m long, ~2.5m tall
Example: If a 2-meter tall object appears to be 4 mils in your scope, it's 500 meters away: (2 × 1000) ÷ 4 = 500m
What's the difference between NATO mils and Russian mils?
NATO/US Military: 6400 mils = 360° (1 mil = 0.05625°)
- Used by NATO countries, US military, most Western forces
- Divides circle into 6400 parts (approximation of 2000π)
Soviet/Russian: 6000 mils = 360° (1 mil = 0.06°)
- Used by Russian and former Soviet militaries
- Divides circle into 6000 parts (decimal convenience)
Practical impact: Russian mil is slightly larger. Always verify which system your equipment uses. Most modern Western civilian and military equipment uses NATO mils.
How do mil-dot scopes work?
Mil-dot reticle: Crosshairs marked with dots spaced 1 mil apart (center-to-center).
Applications:
- Range estimation: Measure target size in mils, calculate distance
- Holdover: Use lower dots for bullet drop compensation
- Windage: Use horizontal dots for wind drift correction
- Moving targets: Lead calculation using mil spacing
Example: Target (1.7m tall person) covers 2 mil-dots → Range = (1.7 × 1000) ÷ 2 = 850 meters
Modern variations: Mil-dot, mil-hash, Christmas tree reticles all use milliradian spacing for calculations.
Conversion Table: Arcsecond to Mil
| Arcsecond (″) | Mil (mil) |
|---|---|
| 0.5 | 0.003 |
| 1 | 0.005 |
| 1.5 | 0.007 |
| 2 | 0.01 |
| 5 | 0.025 |
| 10 | 0.049 |
| 25 | 0.124 |
| 50 | 0.247 |
| 100 | 0.494 |
| 250 | 1.235 |
| 500 | 2.469 |
| 1,000 | 4.938 |
People Also Ask
How do I convert Arcsecond to Mil?
To convert Arcsecond to Mil, enter the value in Arcsecond in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our angle converter page to convert between other units in this category.
Learn more →What is the conversion factor from Arcsecond to Mil?
The conversion factor depends on the specific relationship between Arcsecond and Mil. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.
Can I convert Mil back to Arcsecond?
Yes! You can easily convert Mil back to Arcsecond by using the swap button (⇌) in the calculator above, or by visiting our Mil to Arcsecond converter page. You can also explore other angle conversions on our category page.
Learn more →What are common uses for Arcsecond and Mil?
Arcsecond and Mil are both standard units used in angle measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our angle converter for more conversion options.
For more angle conversion questions, visit our FAQ page or explore our conversion guides.
Helpful Conversion Guides
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📚 How to Convert Units
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🔢 Conversion Formulas
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⚠️ Common Mistakes
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Verified Against Authority Standards
All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.
National Institute of Standards and Technology — Fundamental physical constants and unit conversions
Bureau International des Poids et Mesures — International System of Units (SI) definitions and standards
International Organization for Standardization — Quantities and units international standards series
Last verified: February 19, 2026