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Kalkulačka UV indexu

Průvodce UV indexem

UV Index (0–11+)
Skin Type

What is UV Index Calculator?

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UV Index je mezinárodní standard měřící intenzitu ultrafialového záření ze slunce v rozsahu od 0 (žádné UV) do 11+ (extrémní). Byl vyvinut kanadskými vědci v roce 1992 a přijat WHO.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to UV Index Calculator

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  1. 1UV Index calculated from satellite data weighted by erythema action spectrum
  2. 2Higher altitude, lower latitude, and summer months all increase UV Index
  3. 3Safe exposure time varies by Fitzpatrick skin type I through VI
  4. 4SPF rating of sunscreen directly reduces the UV dose reaching skin

Worked Examples

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Example 1
Given:UV Index 3, Fitzpatrick skin type II
Výsledek:Wear SPF 30+, approximately 50 minutes safe exposure
Example 2
Given:UV Index 8, Fitzpatrick skin type I
Výsledek:Full protection required, only about 12 minutes safe
Example 3
Given:UV Index 11 or higher
Výsledek:Avoid outdoor midday exposure, SPF 50+ essential

UV Index Protection Guide

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UV IndexLevelRecommended SPFAction
0–2LowSPF 15Minimal protection needed
3–5ModerateSPF 30Cover up, wear sunglasses
6–7HighSPF 30–50Hat and shade at midday
8–10Very HighSPF 50+Extra protection essential
11+ExtremeSPF 50+ reapplyAvoid outdoor midday

Frequently Asked Questions

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Q

What is Uv Index?

A

The UV Index is an international standard measuring ultraviolet radiation intensity from the sun, ranging from 0 (no UV) to 11+ (extreme). It was developed by Canadian scientists in 1992 and adopted by the WHO

Q

How accurate is the Uv Index calculator?

A

The calculator uses the standard published formula for uv index. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

Q

What units does the Uv Index calculator use?

A

This calculator works with inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.

Q

What formula does the Uv Index calculator use?

A

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.

Deep Dive

Read the full guide on how to use this calculator effectively

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Formula-verified for precision
Reviewed October 2026
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