๐ค๏ธ Weather
UV Exposure Time Calculator
Time to burn is your skin's minimum erythemal dose divided by the UV intensity, so it falls sharply as the index climbs โ skin that lasts an hour at UV 3 burns in under twenty minutes at UV 10. Sunscreen extends that, but not by the full SPF unless it is reapplied.
How it works
UV index
Skin type
Sunscreen SPF
Sunscreen properly applied
Unprotected burn time
Protected burn time
Minimum erythemal dose
Erythemal irradiance
Recommended exposure limit
Risk
Frequently asked questions
How do I use the UV Exposure Time Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.