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Angle
Arcseconds to Degrees
Convert arcseconds (arcsec) to degrees (°). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 arcsec = 0.000278 °
Arcseconds to Degrees Conversion Table
Common values, ready to copy:
| arcseconds | degrees |
|---|---|
| 1 arcsec | 0.000278 ° |
| 2 arcsec | 0.000556 ° |
| 5 arcsec | 0.001389 ° |
| 10 arcsec | 0.002778 ° |
| 25 arcsec | 0.006944 ° |
| 50 arcsec | 0.013889 ° |
| 100 arcsec | 0.027778 ° |
| 1,000 arcsec | 0.277778 ° |
Formula
degrees = arcseconds × 2.77777778e-4
Angles are ratios, not absolute quantities, so the conversion factors are exact. 1 full turn = 360° = 2π rad ≈ 6.2832 rad = 400 gon. 1° = 60 arcminutes = 3,600 arcseconds.
About Arcseconds and Degrees
Arcseconds (arcsec): 1/60 of an arcminute, or 1/3600 of a degree; the unit for very small angles in astronomy. Common uses: Astronomical resolution (a telescope's resolving power in arcseconds), positional precision of stars, and very fine engineering angle specifications.
Degrees (°): 1/360 of a full turn; the 360-degree division comes from ancient Babylonian astronomy and the convenience of 360 being divisible by many small integers. Common uses: Navigation (compass headings), construction (angle cuts), geometry, geography (latitude and longitude), and almost any practical angle measurement.
How the conversion works
Angles are ratios, not absolute quantities, so the conversion factors are exact. 1 full turn = 360° = 2π rad ≈ 6.2832 rad = 400 gon. 1° = 60 arcminutes = 3,600 arcseconds.
The exact relationship is degrees = arcseconds × 2.77777778e-4, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between arcseconds and degrees comes up wherever angle measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.