Your Personal SPF Calculator
Water intensifies UV exposure. Reflection alone can increase radiation by up to 40%. Enter your details and get a personalized, science-backed SPF recommendation.
Complete all fields and click "Calculate SPF" to calculate your recommended sun protection factor.
Disclaimer & Limitation of Liability
This SPF calculator is provided for informational purposes only. Results are estimates based on the Fitzpatrick Skin Type Scale, WHO UV Index recommendations (2002), and dermatological guidelines on Minimal Erythemal Dose (ISO 17166). They do not constitute medical or dermatological advice.
Individual sun protection requirements vary based on factors not captured by this calculator, including medication use, photosensitivity disorders, altitude, reflective surfaces (snow, sand, water), and personal health conditions. The standard test dosage (2 mg/cm²) is rarely achieved in practice — real-world protection is typically lower than the stated SPF value.
RESTUBE GmbH expressly disclaims all liability for any damages arising from reliance on the results of this calculator. Always follow sunscreen manufacturer instructions, reapply regularly — especially after swimming, sweating, or towelling — and consult a qualified dermatologist if you have elevated photosensitivity or are taking medication that affects UV tolerance.
Water Safety Guide
Learn more about sun protection & water safety
Science-based guides on UV, sunscreen, and water safety in our complete Water Safety Guide.
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PREVENTIONRead Article →Sun Protection for Water Sports: UV Radiation, Sunscreen & UV Clothing
On the water, UV radiation hits harder than anywhere else. The water surface reflects up to 40% of radiation back at you. That means your skin is being hit from two directions at once. On top of that, water sports often mean hours of exposure with no natural shade. Your skin faces a significantly higher radiation intensity than on land - substantially increasing the risk of sunburn and long-term skin damage.
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PREVENTIONRead Article →Drink, Eat, Swim, Repeat: The Complete Hydration and Nutrition Guide for Swimmers
Swimming demands more from your body than most people realize. Whether you train seriously or simply enjoy a relaxed session at the pool, what you eat and drink has a direct impact on how you feel in the water and how quickly you recover afterwards. The right nutrition before training fuels your performance. The right nutrition after training rebuilds your muscles. And staying hydrated throughout makes the difference between sharp focus and early fatigue. This guide covers everything swimmers need to know: from calorie requirements and meal timing to the truth about the post-swim snack and why the old myth about swimming after eating is long overdue for a rethink.
