Arcsecond to Radian
Convert ″ to rad instantly — free, no sign-up.
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About the Arcsecond (″)
The Arcsecond is one sixtieth of an arcminute (1/3600 of a degree), the standard unit for extremely precise angular measurements in astronomy, such as stellar parallax.
About the Radian (rad)
The Radian is the SI unit of angle, defined so a full circle equals 2π radians — the natural unit for calculus and most programming math functions (Math.sin, Math.cos, etc.).
How to convert ″ to rad
- Enter the value in ″ in the box above.
- The rad equivalent updates instantly.
- Use the swap button to convert rad back to ″ just as easily.