Sun Protection Calculator
Calculate safe sun exposure time, reapplication schedule, and sunscreen needs based on UV index, skin type, and SPF.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Burn Time (No SPF)
17min
Protected Burn Time
300min
How to Use This Calculator
- Enter the current UV Index for your location (check a weather app or UV forecast).
- Select your Skin Type (Fitzpatrick I-VI) and the Sunscreen SPF being used.
- Enter Altitude and toggle Near Water/Snow to account for UV reflection.
- Enter Time Outdoors (min) to assess cumulative exposure.
- Review Protected Burn Time, Reapply Interval, and Effective UV Index to plan sun safety.
How the result changes with UV Index
| UV Index | Burn Time (No SPF) | Protected Burn Time |
|---|---|---|
| 1.5 | 67min | 1,200min |
| 5.25 | 19min | 343min |
| 9.75 | 10min | 185min |
| 14 | 7min | 129min |
What each input means
- UV Index
- Current UV index from weather forecast.
- Skin Type
- Fitzpatrick type 1–6.
- Sunscreen SPF
- Sun Protection Factor.
- Altitude
- UV increases ~4% per 1,000 ft.
- Near Water/Snow
- 0=no, 1=yes. Adds ~50% UV.
- Time Outdoors
- Planned outdoor time.
What each result means
- UV Risk Level
- 1=low to 5=extreme.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersUV Index = 6, Skin Type = 2, Sunscreen SPF = 30, Altitude = 0 = 6 input(s) provided
- Calculate Burn Time17 = 17
- Calculate Protected Burn Time300 = 300
- Calculate Effective UV Index6 = 6
- Calculate Reapply EveryReapply Every = min(120, protectedBurnMin * 0.75)120 = 120
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Fitzpatrick Skin Type Calculator
Classify your skin type (I–VI) based on genetic disposition and sun reaction to determine UV sensitivity, burn risk, and SPF recommendations.
DermatologyMelanoma Risk Calculator
Estimate relative melanoma risk based on skin type, mole count, family history, sunburn history, and other established risk factors.
Weather & ClimateUV Index Calculator
Assess UV exposure risk based on UV index, skin type, altitude, and snow cover. Get personalized burn time and SPF recommendations.
Cosmetics FormulationSPF Formulation Calculator
UV filter percentages for target SPF from in-vitro data.
Roofing SystemsSpray Foam Roofing Calculator
Foam volume and coating from roof area and R-value target.
More in Medical & Clinical.