UV Exposure Time Calculator

Estimate how quickly unprotected skin may start to redden under the sun based on UV Index and skin type. This is an approximate estimate.

Typical range: 0–11+ (higher = faster burn).
Choose the closest match.
Protection increases estimated safe time.
Midday sun is usually strongest.
Higher altitude increases UV intensity.
Bright surfaces can boost exposure.
How we calculate

We start with a simplified “time to reddening” baseline by skin type, then adjust using UV Index and modifiers (time of day, altitude, surface reflection, and protection). This is an educational estimate.