Angle Converter — Degrees, Radians & Gradians
Quick answer: Enter an angle in degrees, radians, or gradians to convert to all other angle units.
Convert any angle between degrees, radians, gradians, turns, arc minutes, and arc seconds. Enter a value in any unit and get all conversions at once. Essential for trigonometry, navigation, and engineering.
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Last reviewed: April 2026Report an error
Degrees
90°
90 degrees = 90° = 1.570796 rad = 100 grad.
Degrees
90°
Radians
1.570796
Gradians
100
Turns
0.25
Arc Minutes
5400
Arc Seconds
324000
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How to Use This Angle Converter Calculator
- 1Enter the angle value.
- 2Select the input unit (degrees, radians, or gradians).
- 3Read the converted values in all other units.
Frequently Asked Questions
- Multiply by π/180. Example: 90° × (π/180) = π/2 ≈ 1.5708 radians.
- Multiply by 180/π. Example: π/4 × (180/π) = 45°.
- A gradian (or gon) divides a right angle into 100 parts. A full circle = 400 gradians. Used in surveying and some European engineering. 90° = 100 grad.
- A turn = 360° = 2π radians. It represents one full revolution. Sometimes written as τ (tau = 2π ≈ 6.2832).
- 1 degree = 60 arc minutes (′). 1 arc minute = 60 arc seconds (″). Used in astronomy, GPS coordinates, and optics.
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