Angle Converter — Angles are measured in degrees (°), radians (rad), or gradians (gon) depending on the field. Math and physics use radians. Navigation, surveying, and astronomy use degrees (often subdivided into arcminutes and arcseconds). Civil engineering in some countries uses gradians.
Conversions run locally in your browser. No values are sent anywhere.
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Angle Converterとは？
Angles are measured in degrees (°), radians (rad), or gradians (gon) depending on the field. Math and physics use radians. Navigation, surveying, and astronomy use degrees (often subdivided into arcminutes and arcseconds). Civil engineering in some countries uses gradians.
One full turn is 360° = 2π rad = 400 gon. This converter uses the radian as the base.
使い方
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Enter a value
Type the angle in any supported unit. The default is 1 degree.
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Pick the units
The from/to dropdowns include degrees, radians, gradians, arcminutes, arcseconds, and turns.
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Watch the result
The result updates live as you type. The quick-reference table shows 1, 10, 100, 1000, 10000 in the source unit.
使用例
180° in radians
A straight angle is π radians.
180°
結果： ≈ 3.14159 rad
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Last reviewed: 2026-09-25