18 degrees to radians
0.3142 rad
18° = 0.3142 rad.
radians
0.3142rad
18° = 0.3142 rad
In short
How many radians is 18 degrees?
18° = 0.3142 rad. 1 degree = 0.017453 radians, so the working is 18 × 0.017453 = 0.3142.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 degree = 0.017453 radians 18 × 0.017453 = 0.3142
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (rad) | Off by |
|---|---|---|
| Whole number | 0 | −0.31416 |
| 1 decimal | 0.3 | −0.01416 |
| 2 decimals | 0.31 | −0.00416 |
Round trip: take 0.3142 rad back the other way and you land on 18.0023° — a drift of 0.0023°. That gap is the rounding, not the conversion.
Frequently asked questions
What is 18 degrees in radians?
18 degrees is 0.3142 radians. 1 degree = 0.017453 radians, so the working is 18 × 0.017453 = 0.3142.
How accurate is 0.3142 rad?
Rounding to 0.3142 rad and converting straight back gives 18.0023°, a drift of 0.0023° from the 18 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
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