18 Arc Seconds to Degrees

18" = 0.005°

Calculation: ° = 18" × 0.000277778 = 0.005°

Arc Second to Degree Converter

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Sig. Figures:

How wide is 18"?

18 arc second (0.005 degrees) is comparable to the precision of a telescope crosshair, an almost imperceptible angle.

What does 18" look like?

Illustration of a telescope crosshair reticle
18 arc second (0.005 degrees) is comparable to the precision of a telescope crosshair, an almost imperceptible angle.

How to Convert Arc Second to Degree

1 arc second = 0.000277778 degrees

Degree = Arc Second × 0.000277778

Example: 18" × 0.000277778 = 0.005°

Reverse Conversion

To convert degrees back to arc seconds:

  • Remember, 1 degree equals 3600 arc seconds.
  • To convert 0.005° to", multiply 0.005 x 3600, resulting in 18".

18 " is also equal to:

  • 0.0055556 gradian

Frequently Asked Questions

How much is 18 arc seconds in degrees?

18 arc seconds equals 0.005 degrees. This is calculated by multiplying 18 by the conversion factor 0.000277778.

What does 18 arc seconds look like in degrees?

18 arc seconds equals 0.005 degrees, a conversion used in navigation, trigonometry, and engineering design.

How do you calculate 18 arc seconds to degrees?

Multiply 18 by the conversion factor 0.000277778. The calculation is 18 × 0.000277778 = 0.005 degrees. This factor is defined by international measurement standards.

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18 arc seconds = 0.005 degrees
18 arc seconds = 0.005 degrees — conversion chart

Nearby Conversions

8 arc seconds0.002222 degrees 9 arc seconds0.0025 degrees 10 arc seconds0.002778 degrees 11 arc seconds0.003056 degrees 12 arc seconds0.003333 degrees 13 arc seconds0.003611 degrees 14 arc seconds0.003889 degrees 15 arc seconds0.004167 degrees 16 arc seconds0.004444 degrees 17 arc seconds0.004722 degrees 19 arc seconds0.005278 degrees 20 arc seconds0.005556 degrees 21 arc seconds0.005833 degrees 22 arc seconds0.006111 degrees 23 arc seconds0.006389 degrees 24 arc seconds0.006667 degrees 25 arc seconds0.006944 degrees 26 arc seconds0.007222 degrees 27 arc seconds0.0075 degrees 28 arc seconds0.007778 degrees

For general conversions between arc seconds and degrees, see the arc seconds to degrees converter.

Conversion factors verified against BIPM, ISO 80000-3 1 turn = 2π rad = 360° (exact, ISO 80000-3). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.