Arcsin Calculator

The arcsine function (arcsin or sin⁻¹) is the inverse of the sine function. Given a value between -1 and 1, it returns the angle whose sine equals that value. The result is always in the range [-90°, 90°] or [-π/2, π/2] radians.

1. Enter a value between -1 and 1
2. Select DEG to see result in degrees, or RAD for radians
3. The angle is calculated automatically
4. Both degree and radian values are shown

• Calculate inverse sine for any valid value
• Results in both degrees and radians
• Input validation for domain [-1, 1]
• Shows verification: sin(result) = input
• Real-time calculation

Why must input be between -1 and 1?

Because sine function only outputs values in the range [-1, 1]. No angle has a sine greater than 1 or less than -1.

What is arcsin(0.5)?

arcsin(0.5) = 30° or π/6 radians. This means sin(30°) = 0.5.

What is the difference between arcsin and sin⁻¹?

They are the same function. arcsin(x) = sin⁻¹(x). Note: sin⁻¹(x) ≠ 1/sin(x).