MyPure Journal · Sun Care
SPF 30 vs SPF 50:
Which Sunscreen Should You Choose?
Walk into any pharmacy or beauty store and you’ll see sunscreens labelled SPF 15, SPF 30, SPF 50 and even SPF 50+. The answer to which you should choose might surprise you.
“Both SPF 30 and SPF 50 offer excellent protection — but the difference between them is much smaller than most people expect.”
The Short Answer
Both SPF 30 and SPF 50 offer excellent protection when applied correctly and generously. SPF 30 blocks approximately 97% of UVB rays; SPF 50 blocks around 98%. The difference is smaller than the numbers suggest — but SPF 50 provides a useful safety margin if you don’t apply quite enough.
What Does SPF Actually Mean?
SPF stands for Sun Protection Factor and measures how well a sunscreen protects your skin from UVB rays — the part of the sun’s ultraviolet radiation primarily responsible for sunburn.
Rather than thinking about time, it’s more helpful to understand SPF as a measure of how much UVB radiation reaches your skin.
How Much UV Does Each SPF Block?
The differences are smaller than most people expect.
| SPF | UVB Protection | UVB Rays That Reach Skin |
|---|---|---|
| SPF 15 | 93% | 1 in 15 |
| SPF 30 | 97% | 1 in 30 |
| SPF 50 | 98% | 1 in 50 |
| SPF 50+ | At least 98% | Fewer than 1 in 50 |
Why Do Dermatologists Often Recommend SPF 50?
If SPF 30 blocks 97% of UVB rays, why do many experts recommend SPF 50? The answer is simple: most people don’t apply enough sunscreen.
Starting with SPF 50 can provide a helpful margin of safety if you accidentally apply less than you should.
Don’t Forget UVA Protection
While SPF measures UVB protection, UVA rays penetrate deeper into the skin and are associated with premature skin ageing. In the UK, look for the UVA logo inside a circle on the packaging.
Is SPF 30 Enough?
For many people, yes — when applied generously, evenly, and reapplied every two hours during prolonged sun exposure. For everyday activities like commuting or walking, SPF 30 is often a practical and sufficient choice.
When Might SPF 50 Be a Better Option?
You may prefer SPF 50 if you have very fair skin, burn easily, spend long periods outdoors, or are on holiday in intense sunshine. The higher SPF provides extra protection and can compensate slightly if application isn’t perfect.
Mineral SPF vs Chemical SPF
Both mineral and chemical sunscreens are available in SPF 30 and SPF 50 formulations. The SPF number tells you how much UVB protection the product provides. Every SPF product at MyPure uses non-nano mineral UV filters — zinc oxide or titanium dioxide — so you get broad-spectrum protection with ingredients designed to stay on the surface of your skin.
Common SPF Myths
🚫 Myth: SPF 50 is twice as strong as SPF 25.
False. SPF numbers are not linear. SPF 50 does not provide twice the protection of SPF 25.
🚫 Myth: You only need to apply sunscreen once.
False. Sunscreen gradually wears away through normal daily activities. Regular reapplication is essential.
🚫 Myth: SPF 50 means you can stay in the sun all day.
False. No sunscreen blocks 100% of UV radiation. Seeking shade and wearing protective clothing remain important.
🚫 Myth: You don’t need sunscreen on cloudy days.
False. Up to 80% of UV rays can penetrate cloud cover.
Which SPF Should You Choose?
“The best sunscreen is the one you’ll actually wear — every single day.”
For most people, SPF 30 applied generously and consistently offers excellent everyday protection. SPF 50 gives you a little extra safety margin. Whichever you choose, reapplication matters more than the SPF number.
Natural Sun Care at MyPure
View all →Our View at MyPure
At MyPure, we believe consistency is more important than chasing the highest SPF number. A sunscreen that feels comfortable on your skin and that you’ll happily apply every day is always the best choice. Every SPF in our range uses non-nano mineral UV filters — no chemical UV absorbers, no nano particles.
Whether you choose SPF 30 or SPF 50, remember to apply generously, reapply every two hours when outdoors, and combine sunscreen with shade and protective clothing.
Protect your skin today — and help keep it healthy for years to come.
Shop Natural Sun Care at MyPure →Frequently Asked Questions
Is SPF 50 worth buying over SPF 30?
SPF 50 blocks slightly more UVB radiation than SPF 30 and can provide a greater safety margin if you don’t apply enough. Both offer excellent protection when used correctly.
Does SPF 50 last longer than SPF 30?
No. Both should be reapplied every two hours when outdoors, and after swimming or sweating. The SPF number is not a measure of duration.
Can I use SPF 30 every day?
Yes. SPF 30 provides excellent everyday protection when applied generously. The most important thing is using it consistently.
What is broad-spectrum sunscreen?
A broad-spectrum sunscreen protects against both UVA and UVB rays. In the UK, look for the UVA logo inside a circle on the packaging.