Quick Answer
RADIANS Function
Converts degrees to radians.
✓ Excel✓ Google SheetsExcel All versions
Syntax
RADIANS
(angle)
Parameters
| Parameter | Description | Required |
|---|---|---|
| angle | The angle in degrees that you want to convert to radians. | Required |
Basic Example
Convert 180 degrees to radians
=RADIANS(180)Result3.141592654
180° equals π radians, about 3.14159.
Advanced Examples
Example 1: Convert 90 degrees
A quarter turn.Pass 90.
=RADIANS(90)Result: 1.570796327
90° is π/2 radians, about 1.5708.
Example 2: Convert 45 degrees
Common angle for trig.Pass 45.
=RADIANS(45)Result: 0.785398163
45° is π/4 radians, about 0.7854.
How RADIANS Works
RADIANS multiplies the degree value by π/180 to produce the equivalent radian measure. It is the inverse of DEGREES.
1
Select the cell
Click the cell for the radian result.
2
Enter the formula
Type =RADIANS(angle_in_degrees).
3
Press Enter
The radian value appears.
Important Notes & Limitations
It only converts degrees to radians, not the reverse (use DEGREES for that).
Results are floating-point approximations.
Common Errors & Fixes
#VALUE!Non-numeric argument.Fix: Supply a numeric angle in degrees.
Download Practice File
RADIANS
radiansPractice RADIANS with Real Data
Download a sample CSV file with pre-populated data and practice exercises for the RADIANS function. Works in both Excel and Google Sheets.
Works in Google SheetsCompatible with ExcelIncludes exercises
File format: CSV (comma-separated values) - opens in Excel, Google Sheets, and all spreadsheet apps
Frequently Asked Questions
What formula does RADIANS use?
radians = degrees × π / 180.
Why convert to radians at all?
Excel's trigonometric functions (SIN, COS, TAN) expect angles in radians.
How do I go back to degrees?
Use DEGREES(radians), which multiplies by 180/π.