What is SPF and
how often should you apply it?
Discover what SPF is, what SPF in sunscreen really means, how sun filters protect your skin and learn the best practices for how often to apply sunscreen for effective sun protection.
Sun protection is essential for helping you maintain healthy-looking skin and preventing long-term damage. Prolonged exposure to the sun can cause sunburn, premature ageing and increase the risk of skin damage. Sunscreen plays a crucial role in shielding your skin from harmful UV radiation, and understanding what SPF is can really help you choose the right protection.
What is SPF?What does
What does
SPF stand for?
The SPF on sunscreen stands for Sun Protection Factor – if you have ever wondered “what does SPF stand for” or “what does SPF mean”, this is the answer. It's a relative measurement for the amount of time the sunscreen will protect your skin from ultraviolet (UV) rays. The higher the SPF number, the higher the percentage of UVB rays it will block.
How does SPF work?
SPF is determined by measuring the time it takes for redness (erythema) to appear on unprotected skin exposed to a specific dose of UV rays, compared with unprotected skin. So, in theory, an SPF 30 sun cream would last 30 times longer than the same exposure without protection.
In practice, however, it's a different story, as the duration of a sun cream's effectiveness can depend on a number of factors, such as the quantity applied, the UV index and whether your skin is sweating or swimming. The SPF value should therefore be seen more as a guide, and reapplied regularly, especially if you're wondering what the factor on sunscreen really means for you in everyday life.
In practice, however, it's a different story, as the duration of a sun cream's effectiveness can depend on a number of factors, such as the quantity applied, the UV index and whether your skin is sweating or swimming. The SPF value should therefore be seen more as a guide, and reapplied regularly, especially if you're wondering what the factor on sunscreen really means for you in everyday life.
SPF levelsThe difference between
The difference between
SPF levels
The difference between SPF levels lies in the amount of UVB protection they offer, which helps explain the difference between SPF 30 and 50 or even higher factors.
- SPF 15 blocks approximately 93% of UVB rays
- SPF 30 blocks about 97% of UVB rays
- SPF 50 blocks approximately 98% of UVB rays
SPF is determined by measuring the time it takes for redness (erythema) to appear on unprotected skin exposed to a specific dose of UV rays, compared with unprotected skin. So, in theory, an SPF 30 sun cream would last 30 times longer than the same exposure without protection. In practice, however, it's a different story, as the duration of a sun cream's effectiveness can depend on a number of factors, such as the quantity applied, the UV index and whether your skin is sweating or swimming. The SPF value should therefore be seen more as a guide, and reapplied regularly, especially when you're choosing between sunscreen SPF 50 vs 30 and want to know what the SPF number means for real-life use.
How to apply
SPF correctly
Applying sunscreen correctly is essential to ensure maximum UV protection. Even the most effective sunscreen won't work if you don't apply it properly.
1. Apply generously
Sunscreen should be applied generously to all uncovered areas. The amount of SPF needed varies by age:
- Under 3 years: Avoid exposing babies and young children to the sun at all costs by keeping them in the shade and using protective clothing, a hat, sunglasses and a parasol, as their skin is extremely delicate and more vulnerable to UV damage. For uncovered areas subject to indirect exposure, use a minimum of 5 to 10 ml for babies aged 6 months and over.
- Children (3–5 years): At least 10–15 ml. For more information on choosing the right sun protection for children, check NIVEA's sunscreen guide for children.
- Children (5–10 years): Require at least 15–20 ml for full coverage.
- Adults and children over 10: Need at least 30–40 ml for the whole body.
2. Apply 15–30 minutes before sun exposure
This allows the sunscreen to fully absorb and start protecting your skin.
3. Cover all exposed areas
Don't forget areas like your ears, neck, scalp (if exposed), the backs of your hands and your feet.
4. Use a dedicated face sunscreen
When applying SPF to your face, make sure you use a sunscreen formulated for the face and sensitive skin.
How long does SPF 50 last and
how often should you reapply sunscreen?
The effectiveness of a sunscreen decreases over time, especially with exposure to water, sweat or towel-drying. Additionally, the lower the SPF and the longer the time since application, the fewer UVB rays will be filtered.
Regardless of the SPF level you use, to maintain optimal protection, sunscreen should be reapplied every two hours. If you are swimming, sweating or towel-drying, it will wear off more quickly, requiring more frequent reapplication. Always check the sunscreen's water-resistant label for specific guidance on reapplication during water activities. Regular reapplication ensures continuous protection throughout the day.
Regardless of the SPF level you use, to maintain optimal protection, sunscreen should be reapplied every two hours. If you are swimming, sweating or towel-drying, it will wear off more quickly, requiring more frequent reapplication. Always check the sunscreen's water-resistant label for specific guidance on reapplication during water activities. Regular reapplication ensures continuous protection throughout the day.
Facts overviewWhat is SPF and
What is SPF and
how often should you apply it
Application:
Sunscreen should be reapplied every two hours or more frequently if you are swimming or sweating.
What is SPF:
SPF stands for Sun Protection Factor, indicating the level of protection sunscreen provides against UVB rays and helping you understand what the SPF number means on the bottle.
SPF levels:
SPF 15 blocks approximately 93% of UVB rays
SPF 30 blocks approximately 97% of UVB rays.
SPF 50 blocks approximately 98% of UVB rays.
Protection with SPF for face and bodyProtection with SPF
Protection with SPF
for the face
Your face is highly exposed to UV rays, making daily SPF application essential to prevent sun damage and premature ageing. SPF 50 provides higher protection, though lower SPFs can work during less intense exposure if applied and reapplied correctly.
Apply sunscreen as the last step of your skincare routine and before you apply any makeup, covering your face, neck and upper torso. Using moisturisers with SPF offers a convenient way to add SPF into your routine.
Although many makeup products now contain SPF, they are generally not applied in sufficient quantities to offer adequate protection. It's therefore important to make sure you are still using a sufficient amount of sunscreen for optimal protection.
For added convenience, the NIVEA 2in1 Prime UV Serum offers instant SPF 50+ protection and smoothness in a lightweight, fragrance-free formula. Infused with Hyaluron for hydration of the upper layers of the skin and Licochalcone A to boost your skin's natural defence mechanisms (in vitro tested), this serum helps combat premature ageing caused by the sun while keeping your skin looking healthy. Absorbing quickly without greasiness, it provides seamless daily sun protection.
Designed for convenience, its premium dispenser ensures effortless application. The 2-in-1 action protects and smooths, making it perfect for busy lifestyles. It works well alone or as a primer under makeup, delivering long-lasting hydration and defence for healthy-looking, soft skin.
Apply sunscreen as the last step of your skincare routine and before you apply any makeup, covering your face, neck and upper torso. Using moisturisers with SPF offers a convenient way to add SPF into your routine.
Although many makeup products now contain SPF, they are generally not applied in sufficient quantities to offer adequate protection. It's therefore important to make sure you are still using a sufficient amount of sunscreen for optimal protection.
For added convenience, the NIVEA 2in1 Prime UV Serum offers instant SPF 50+ protection and smoothness in a lightweight, fragrance-free formula. Infused with Hyaluron for hydration of the upper layers of the skin and Licochalcone A to boost your skin's natural defence mechanisms (in vitro tested), this serum helps combat premature ageing caused by the sun while keeping your skin looking healthy. Absorbing quickly without greasiness, it provides seamless daily sun protection.
Designed for convenience, its premium dispenser ensures effortless application. The 2-in-1 action protects and smooths, making it perfect for busy lifestyles. It works well alone or as a primer under makeup, delivering long-lasting hydration and defence for healthy-looking, soft skin.
Protection with SPF
for the body
Applying a high SPF properly ensures full-body UV protection, helping to prevent sunburn and long-term skin damage. Adults need 30–40 ml of sunscreen for complete coverage, while children require 10–30 ml depending on age. Apply 15–30 minutes before sun exposure, covering ears, neck, hands, feet and other exposed areas. Reapply every two hours, especially when exercising, to maintain effective protection.
Choosing the
right SPF for your skin
When you are selecting sunscreen, it's important to choose an SPF level that suits your skin type, the environment and the activity you're engaging in, especially if you're asking yourself what is the best SPF for your daily routine.
- Fairer skin tones:For fair skin tones, an SPF 50+ is recommended, as fair skin has lower melanin levels and is more prone to burning and skin damage.
- Darker skin tones:For darker skin tones, an SPF 30+ is usually sufficient, as melanin offers some natural UV defence. However, this does not eliminate the risk of sunburn, hyperpigmentation or skin damage, so daily SPF application remains essential. In some cases, an SPF 50 may be recommended, particularly to protect the face in the event of high exposure or hyperpigmentation.
- Oily skin:For oily skin, it is recommended to use a lightweight, mattifying sunscreen that will not clog pores or feel greasy. Sun protection products in fluid or gel form generally give a less oily effect than creams. Look for products with an ultra-light texture and ingredients such as Niacinamide to absorb excess sebum and help prevent imperfections.
- Sensitive skin:For sensitive skin, choose sun creams specially formulated for this skin type and which have been dermatologically tested. Fragrance-free, ethyl alcohol-free and “for sensitive skin” options help minimise the risk of redness appearing and discomfort.
- Dry skin:Dry skin benefits from hydrating sunscreens enriched with ingredients like Hyaluronic Acid, Glycerine or Ceramides to lock in moisture while providing UV protection. Many SPF-infused moisturisers offer both sun protection and hydration, helping prevent dryness and flaking caused by prolonged sun exposure.
Should you choose SPF 50 or 30?
What's the difference?
What's the difference?
The choice between SPF 30 or 50 will depend mainly on your skin type, the UV index and how long you plan to stay in the sun. Although in theory, SPF 50 blocks approximately 98% of UVB rays, as opposed to approximately 97% for SPF 30, the actual protection will depend on the quantity applied, the exposure time and the frequency of application.
Protection levels above SPF 50 only offer marginal additional coverage, and no level of SPF can provide 100% protection. In most situations, SPF 30 is adequate protection if applied correctly and regularly; however, SPF 50 remains the safer option for fair skin or heavy exposure. If you are curious about the difference between SPF 30 and 50 and want trusted sun protection, try our NIVEA Sun Protect & Moisture SPF 50 Lotion.
Protection levels above SPF 50 only offer marginal additional coverage, and no level of SPF can provide 100% protection. In most situations, SPF 30 is adequate protection if applied correctly and regularly; however, SPF 50 remains the safer option for fair skin or heavy exposure. If you are curious about the difference between SPF 30 and 50 and want trusted sun protection, try our NIVEA Sun Protect & Moisture SPF 50 Lotion.
NIVEA SUN Protect & Moisture Lotion SPF 50+
NIVEA SUN Protect & Moisture Spray SPF 50+ provides broad-spectrum UVA and UVB protection, helping to prevent sunburn and premature ageing. Its formula contains Vitamin E and Vitamin C, with antioxidant properties, as well as Hyaluron, which can help retain water in the skin. This spray protects your skin from harmful UV rays while keeping it moisturised for up to 48 hours*. Its formula absorbs quickly, leaving no white cast.
With a water-resistant formula, this sunscreen is ideal for outdoor activities (don't forget to reapply regularly, especially after swimming or sweating). It keeps your skin feeling soft, smooth and nourished while maintaining effective sun protection. Suitable for all skin types, its dermatologically tested formula ensures reliable care for daily use.
*Instrumental evaluation, 35 women, 2022
With a water-resistant formula, this sunscreen is ideal for outdoor activities (don't forget to reapply regularly, especially after swimming or sweating). It keeps your skin feeling soft, smooth and nourished while maintaining effective sun protection. Suitable for all skin types, its dermatologically tested formula ensures reliable care for daily use.
*Instrumental evaluation, 35 women, 2022
Summary
SPF measures how effectively sunscreen protects your skin from UVB rays. The higher the SPF, the more protection it offers, but reapplication every two hours is crucial for maintaining sun safety. Apply sunscreen generously and evenly, and make sure you reapply after swimming or sweating for consistent protection. Knowing what SPF is and what the factor on sunscreen means makes it easier for you to pick what is the best SPF for your skin and lifestyle.
