UV Index Calculator
Check what a UV index number means and whether the current level is low, high, or extreme.
Enter a UV index value to see its standard risk category and what level of sun protection usually makes sense.
Minimal protection is usually enough, although sunglasses are still helpful outdoors.
Use sunscreen, shade, and sunglasses if you expect longer outdoor exposure.
Protection becomes important. Midday exposure can cause skin damage more quickly.
Reduce unprotected sun exposure, especially in the middle of the day.
Unprotected skin can burn quickly. Limit exposure and use full sun protection.
Protection becomes important. Midday exposure can cause skin damage more quickly.
Dangerous UV conditions usually begin at index 6 and above, when unprotected skin can be damaged much faster.
About the uv index calculator
How this tool works
UV index is most useful when it is translated into a risk category and a practical next step. This calculator helps turn the number into something you can act on more quickly.
It keeps the full scale visible so a single reading also makes sense in the context of the broader UV range.
Where it is useful
The page is useful for outdoor work, travel, exercise, school activities, and general weather awareness.
It also works well as an explainer page because the same tool shows both the current category and the larger UV scale.
- Interpret a forecast UV number before going outside.
- Decide when sunscreen, shade, and protective clothing matter more.
- Explain UV categories to teams, families, or students quickly.
Example workflows
3 examplesUV 2
Low risk
UV 6
High risk
UV 11
Extreme risk
Common uses
3 ideas- Interpret a forecast UV number before going outside.
- Decide when sunscreen, shade, and protective clothing matter more.
- Explain UV categories to teams, families, or students quickly.
FAQ
3 answersWhat does the UV index calculator tell me?
The calculator maps your UV value to the standard low, moderate, high, very high, and extreme categories.
At what UV index does exposure become dangerous?
Most practical guidance treats 6 and above as dangerous enough to require deliberate sun protection.
Can a moderate UV index still matter?
Yes. A moderate reading may still deserve sunscreen and shade if you plan to stay outside for a long time.