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TAN

TAN returns the tangent of an angle measured in radians (sine divided by cosine). Use =TAN(RADIANS(angle)) when working in degrees. The function is undefined at 90° and 270° where cosine is zero, so avoid those exact inputs.

Excel
=TAN(RADIANS(A2))
Google Sheets
=TAN(RADIANS(A2))
✓

Verified example

Computed by a real spreadsheet engine on the sample data below.

Angle (degrees)Tangent
0
45
30
60

=TAN(RADIANS(A2))→0

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Sample data — click any cell to edit

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How it works

  1. 1A2 contains the angle in degrees (e.g. 45).
  2. 2RADIANS(A2) converts degrees to radians before TAN evaluates.
  3. 3TAN(RADIANS(45)) = 1 because tan(45°) = sin(45°)/cos(45°) = 1.

Need a version for your data?

Try: “Calculate the tangent of angles from my degree list”

Related

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Written and reviewed by FormulaCraft Team. Each formula on this page is run through our verification engine before publishing.

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