Enter a value in any field (degrees, radians or slope %). The two other units update automatically.
About this angle converter (degrees, radians and slope %)
This angle converter helps you convert instantly between degrees (°), radians (rad), and slope percentage (%), also called grade. It is useful for geometry, trigonometry, engineering, construction, road design, and any situation where you need to switch between angle units and slope notation.
Degrees and radians are two ways to express the same angle: radians are commonly used in math, physics and programming, while degrees are more common in everyday use. Slope percentage is a practical representation of steepness: slope% = tan(angle) × 100. Because the tangent grows quickly, slope values become extremely large when the angle approaches 90°.
Everything runs locally in your browser: your inputs are not stored or transmitted. Enter a value in any field and the other units update automatically, making it easy to check conversions or verify calculations without switching tools.
Tip: for small angles, slope% is close to the angle in radians × 100, but the exact conversion uses tan().