Angle Converter

Working on a specialized engineering project or studying classical navigation? Our Free Universal Angle Converter is the most versatile tool for circular measurement online. While most calculators only handle Degrees and Radians, we provide a professional-grade interface for niche units used in ballistics (Mils), surveying (Gons), and maritime history (Sextants and Octants).

In 2026, as precision mapping and autonomous drone navigation expand, being able to convert between Minutes of Arc and Revolutions with 100% accuracy is vital. Whether you're calculating a Quadrant in geometry or a Sign in astrology, our tool provides the exact decimal results you need.

Units Supported in This Professional Tool:

• Primary Units: Degree (°), Radian (rad), Gradian / Gon (grad).

• Precision Units: Minute of Arc ('), Second of Arc ("), Mil (NATO & Soviet).

• Rotational & Historic: Revolution (Turn), Sign, Octant, Sextant, Quadrant.

• 100% Free & Fast: The most complete angle suite on HelpingWebTools.com.

What is a "Mil" in angular measurement?

The Mil (milliradian) is primarily used by military forces for artillery and telescopic sights. It is defined differently by different regions: NATO uses 6400 mils to a circle, while the Soviet standard was 6000 mils. Our tool supports these high-precision scales.

How many Degrees are in a "Sign"?

In angular measurement (often used in astronomy and astrology), a Sign represents exactly $30^\circ$, dividing a full circle into 12 equal parts.

What is the difference between a Gon and a Gradian?

They are the same thing! Gon is the name typically used in European surveying and engineering, while Gradian is the more common term in North America. Both represent 1/400th of a full circle.

When would I use a Sextant or Octant unit?

These are historical and navigational units. A Sextant is 1/6th of a circle ($60^\circ$), and an Octant is 1/8th of a circle ($45^\circ$). They are named after the instruments used to measure them in maritime history.

How do "Minutes" and "Seconds" work for angles?

Just like time, one degree is divided into 60 Minutes, and one minute into 60 Seconds. This allows for extreme precision in GPS coordinates and astronomical positioning.