semicircle to radian
Convert semicircle (semicircle) to radian (rad). Use an editable angle converter, conversion formula, and reference table.
1 semicircle = 3.141592654 rad
Conversion formula
One semicircle equals 3.141592654 radian. Multiply your value in semicircle by this factor to get radian. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 semicircle:5 × 3.141592654 = 15.70796327 rad
Conversion table
| semicircle (semicircle) | radian (rad) |
|---|---|
| 0.01 | 0.03141592654 |
| 0.1 | 0.3141592654 |
| 1 | 3.141592654 |
| 2 | 6.283185307 |
| 5 | 15.70796327 |
| 10 | 31.41592654 |
| 25 | 78.53981634 |
| 50 | 157.0796327 |
| 100 | 314.1592654 |
| 1000 | 3,141.592654 |
About these measurements
An angle describes rotation between directions.
The base reference used here is the radian. One semicircle is 3.141592654 base units; one radian is 1 base units.
Important distinctions
A full turn is 360 degrees or 2π radians. Signed angles are permitted.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert semicircle to rad?
Multiply the quantity in semicircle by 3.141592654. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the radian to semicircle converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
