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Tangent Calculator.

Evaluate tangent for an angle entered in degrees.

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Set your values

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02 / ANSWER

Angle

Angle must be finite.

Results update automatically as you type.

Use Cases

Solve trigonometry problems

Quickly find tangent values for homework, tests, or personal math practice without a manual table or complex calculations.

Example: Find tan(45°) = 1 for a geometry problem.

Engineering and physics calculations

Use tangent values in slope calculations, force vector analysis, or wave equations where angles are in degrees.

Example: Calculate the slope angle of a ramp using tan(θ).

Frequently Asked Questions

What does the tangent calculator do?: This calculator evaluates the tangent of an angle you enter in degrees. It returns the tangent value, which is the ratio of the sine to the cosine of that angle.
Can I use this calculator for angles in radians?: No, this calculator only accepts angles in degrees. If you have an angle in radians, convert it to degrees first (multiply by 180/π) before using this tool.
What is the tangent of 90 degrees?: The tangent of 90 degrees is undefined because the cosine of 90 degrees is zero, and division by zero is not possible. The calculator will likely show an error or 'undefined' for this input.

Tips & Common Mistakes

Tips

Enter the angle in degrees only. If your angle is in radians, convert it to degrees first.
For angles like 90°, 270°, etc., the tangent is undefined; expect an error or 'undefined' result.
Use the result for quick estimates, but for critical applications, double-check with a scientific calculator or software.
Remember that tangent is periodic with a period of 180°, so tan(θ) = tan(θ + 180°).

Common Mistakes to Avoid

Entering the angle in radians instead of degrees, leading to incorrect results.
Assuming the tangent of 90° is a large number instead of undefined.
Forgetting that tangent values repeat every 180°, so tan(30°) equals tan(210°).

Last updated: August 13, 2026

Use Cases

Solve trigonometry problems

Quickly find tangent values for homework, tests, or personal math practice without a manual table or complex calculations.

Example: Find tan(45°) = 1 for a geometry problem.

Engineering and physics calculations

Use tangent values in slope calculations, force vector analysis, or wave equations where angles are in degrees.

Example: Calculate the slope angle of a ramp using tan(θ).

Frequently Asked Questions

What does the tangent calculator do?

This calculator evaluates the tangent of an angle you enter in degrees. It returns the tangent value, which is the ratio of the sine to the cosine of that angle.

Can I use this calculator for angles in radians?

No, this calculator only accepts angles in degrees. If you have an angle in radians, convert it to degrees first (multiply by 180/π) before using this tool.

What is the tangent of 90 degrees?

The tangent of 90 degrees is undefined because the cosine of 90 degrees is zero, and division by zero is not possible. The calculator will likely show an error or 'undefined' for this input.

Tips & Common Mistakes

Tips

Enter the angle in degrees only. If your angle is in radians, convert it to degrees first.
For angles like 90°, 270°, etc., the tangent is undefined; expect an error or 'undefined' result.
Use the result for quick estimates, but for critical applications, double-check with a scientific calculator or software.
Remember that tangent is periodic with a period of 180°, so tan(θ) = tan(θ + 180°).

Common Mistakes to Avoid

Entering the angle in radians instead of degrees, leading to incorrect results.
Assuming the tangent of 90° is a large number instead of undefined.
Forgetting that tangent values repeat every 180°, so tan(30°) equals tan(210°).

Use Cases

Solve trigonometry problems

Quickly find tangent values for homework, tests, or personal math practice without a manual table or complex calculations.

Example: Find tan(45°) = 1 for a geometry problem.

Engineering and physics calculations

Use tangent values in slope calculations, force vector analysis, or wave equations where angles are in degrees.

Example: Calculate the slope angle of a ramp using tan(θ).

Frequently Asked Questions

What does the tangent calculator do?

This calculator evaluates the tangent of an angle you enter in degrees. It returns the tangent value, which is the ratio of the sine to the cosine of that angle.

Can I use this calculator for angles in radians?

No, this calculator only accepts angles in degrees. If you have an angle in radians, convert it to degrees first (multiply by 180/π) before using this tool.

What is the tangent of 90 degrees?

The tangent of 90 degrees is undefined because the cosine of 90 degrees is zero, and division by zero is not possible. The calculator will likely show an error or 'undefined' for this input.

Tips & Common Mistakes

Tips

Enter the angle in degrees only. If your angle is in radians, convert it to degrees first.
For angles like 90°, 270°, etc., the tangent is undefined; expect an error or 'undefined' result.
Use the result for quick estimates, but for critical applications, double-check with a scientific calculator or software.
Remember that tangent is periodic with a period of 180°, so tan(θ) = tan(θ + 180°).

Common Mistakes to Avoid

Entering the angle in radians instead of degrees, leading to incorrect results.
Assuming the tangent of 90° is a large number instead of undefined.
Forgetting that tangent values repeat every 180°, so tan(30°) equals tan(210°).