ASIN Function in Excel: Angle From a Sine

ASIN Function in Excel: Angle From a Sine featured illustration

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⏱ 2 min readUpdated 5 October 2026

MathLevel: ExpertAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. ASIN in practice
  5. Where you will use it
  6. Worked example
  7. Mistakes people make
  8. Related functions
  9. Continue learning

ASIN returns the angle (in radians) whose sine is the given number.

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Syntax

=ASIN(number)
Argument What it means
number Between −1 and 1.

Examples

Example 1

=DEGREES(ASIN(0.5))

Returns 30.

ASIN in practice

Where you will use it

  • Angle from a slope ratio
  • Physics and engineering
  • Triangle angles

Worked example

SineFormulaResult
0.5=ROUND(DEGREES(ASIN(A2)),2)30
1=ROUND(DEGREES(ASIN(A3)),2)90
-0.5=ROUND(DEGREES(ASIN(A4)),2)-30

Results calculated in Excel.

Mistakes people make

MistakeWhat to do instead
Outside -1..1#NUM!
RadiansWrap in DEGREES

SIN · DEGREES

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📎 Practice files for this article

  • 📗
    Practice workbook: Math & rounding24 tasks on realistic sales data — type your formula, the Check column turns green when it is right. Answers sheet included.
    ⬇ XLSX · 35 KB

Free to use for learning. Files with macros (.bas) are plain text — import them with Alt+F11 → File → Import File, and always test on a copy.

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