1 Arc Second to Degrees

1" ≈ 0.00027778°

Calculation: ° = 1" × 0.000277778 ≈ 0.00027778°

Arc Second to Degree Converter

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Sig. Figures:

How wide is 1"?

1 arc second (0 degrees) is comparable to the precision of a telescope crosshair, an almost imperceptible angle.

What does 1" look like?

Illustration of a telescope crosshair reticle
1 arc second (0 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: 1" × 0.000277778 = 0.00027778°

Reverse Conversion

To convert degrees back to arc seconds:

  • Remember, 1 degree equals 3600 arc seconds.
  • To convert 0.00027778° to", multiply 0.00027778 x 3600, resulting in 1".

1 " is also equal to:

  • 0.00030864 gradian

Frequently Asked Questions

How much is 1 arc second in degrees?

1 arc second equals 0.00027778 degrees. This is calculated by multiplying 1 by the conversion factor 0.000277778.

What does 1 arc second look like in degrees?

1 arc second equals 0.00027778 degrees, a conversion used in navigation, trigonometry, and engineering design.

How do you calculate 1 arc second to degrees?

Multiply 1 by the conversion factor 0.000277778. The calculation is 1 × 0.000277778 = 0.00027778 degrees. This factor is defined by international measurement standards.

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1 arc second = 0.000277778 degrees
1 arc second = 0.000277778 degrees — conversion chart

Nearby Conversions

2 arc seconds0.0005556 degrees 3 arc seconds0.0008333 degrees 4 arc seconds0.001111 degrees 5 arc seconds0.001389 degrees 6 arc seconds0.001667 degrees 7 arc seconds0.001944 degrees 8 arc seconds0.002222 degrees 9 arc seconds0.0025 degrees 10 arc seconds0.002778 degrees 11 arc seconds0.003056 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.