$radiansToDegrees (Radians to Degrees)

Last updated: 2026-10-09

$radiansToDegrees (Radians to Degrees)

$radiansToDegrees converts radians to degrees by multiplying by 180/π. The inverse trigonometric operators $asin, $acos, $atan, and $atan2 all return radians, so converting to degrees makes the output more business-friendly. It is used for angle display and directional output. A null or missing argument yields null, and NaN input returns NaN. It is the inverse of $degreesToRadians; 180 degrees equals π radians.

📝 Syntax

{ $radiansToDegrees: <numeric-expression> }

⚙️ Parameters

Returns：The degrees equivalent of the input; null when null or missing

▶ Example

Run the commands below in your local mongosh (requires a running mongod):

// $radiansToDegrees: convert radians to degrees
db.trig.aggregate([
  { $project: {
      deg: { $radiansToDegrees: '$rad' }
  } }
])

Output：

{ '_id': 1, 'deg': 180 }
{ '_id': 2, 'deg': 90 }

📌 Notes

• Equivalent to multiplying by 180/π
• Use it to turn $asin, $acos, $atan, and $atan2 results into degrees
• Inverse of $degreesToRadians

🏷️ Related Tags

💡 Related Cases

📚 Related Tutorials

❓ FAQ

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