Arctangent to Radians Reference Values

Calculate inverse tangent and return the principal angle in radians.

Author

Dr. Pablo Gutierrez

Math editorial contributor

Chilean climate scientist at the University of Chile, modeling glacier retreat in the Patagonian ice fields

Reviewed for accuracy by

Prof. Hans Muller

Math content reviewer

German renewable energy engineer at TU Munich, pioneering grid-scale hydrogen storage solutions

Last updatedFebruary 22, 2026

PublishedFebruary 22, 2026

Table of Contents

  1. All value pages
  2. Reference table
  3. FAQs
  4. Methodology and review
  5. Related conversions

Reference Value Index

This page lists 25 reference values for quick browsing and lookup.

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All Reference Values

Reference Table

Arctangent to Radians reference values
Tangent Valueatan(x)
-20 Tangent Value-1.520838 rad
-15 Tangent Value-1.504228 rad
-12.5 Tangent Value-1.490966 rad
-10 Tangent Value-1.471128 rad
-8 Tangent Value-1.446441 rad
-6 Tangent Value-1.405648 rad
-5 Tangent Value-1.373401 rad
-4 Tangent Value-1.325818 rad
-3 Tangent Value-1.249046 rad
-2 Tangent Value-1.107149 rad
-1 Tangent Value-0.785398 rad
-0.5 Tangent Value-0.463648 rad
0 Tangent Value0 rad
0.5 Tangent Value0.463648 rad
1 Tangent Value0.785398 rad
2 Tangent Value1.107149 rad
3 Tangent Value1.249046 rad
4 Tangent Value1.325818 rad
5 Tangent Value1.373401 rad
6 Tangent Value1.405648 rad
8 Tangent Value1.446441 rad
10 Tangent Value1.471128 rad
12.5 Tangent Value1.490966 rad
15 Tangent Value1.504228 rad
20 Tangent Value1.520838 rad

Frequently Asked Questions

Frequently asked questions for Arctangent to Radians and its reference values.

What does the Arctangent to Radians calculator do?

It helps with recovering angles from slope-like values and tangent ratios.

What formula does the Arctangent to Radians calculator use?

atan(x) returns the principal inverse tangent angle in radians, in the range (-π/2, π/2).

What inputs are valid?

Any finite tangent input value is valid.

When would I use this?

recovering angles from slope-like values and tangent ratios

Methodology and Review

Each row on this page links to a value detail page derived from the same conversion data file as the main calculator and reference table. This reduces inconsistencies across page variants.

Editorial metadata and structured data are rendered across the converter page and linked value pages. Review policies are documented in our review process and editorial policy.