Quick answer: On a sunscreen label, SPF 50 is a measured sun protection factor based on protection against UV-induced erythema (sunburn response), while PA++++ is the highest grade in the PA system for UVA protection and corresponds to a measured UVA protection factor (UVAPF) of 16 or more under the Japan Cosmetic Industry Association grading framework.
Last fact-checked: 19 September 2026.
Why sunscreens often show more than one rating
Ultraviolet radiation is not represented by a single number on sunscreen packaging. Different test systems describe different aspects of protection, which is why labels may show combinations such as:
- SPF 30
- SPF 50
- SPF 50+
- PA+++
- PA++++
- Broad Spectrum
- UVA-PF or other market-specific UVA markings
These terms are related, but they are not interchangeable.
What SPF means
SPF stands for Sun Protection Factor. ISO 24444 specifies an in-vivo method for determining SPF and describes it as a measure related to protection against erythema induced by solar ultraviolet radiation.
The U.S. FDA explains SPF in consumer terms as the amount of UV exposure required to cause sunburn when sunscreen is used compared with the amount required without sunscreen. SPF is primarily associated with protection from UVB-driven sunburn response.
A crucial label-reading point: SPF is not a clock. SPF 50 does not literally mean a person can stay in the sun 50 times longer before burning. Real-world UV exposure varies with time of day, geography, weather, application, water, sweat and other factors.
What PA means
PA stands for Protection Grade of UVA. The system originated in Japan and expresses ranges of measured UVA protection factor as plus signs.
The Japan Cosmetic Industry Association maps measured UVAPF values to PA grades as follows:
| Measured UVAPF | PA grade |
|---|---|
| 2 to less than 4 | PA+ |
| 4 to less than 8 | PA++ |
| 8 to less than 16 | PA+++ |
| 16 or more | PA++++ |
ISO 24442 specifies an in-vivo method for determining UVA protection factor. The PA grade is therefore not simply a marketing count of plus signs; it is linked to defined UVAPF ranges in the JCIA system.
So what does “SPF 50 PA++++” communicate?
It communicates two different test-derived pieces of information:
| Marking | What it communicates |
|---|---|
| SPF 50 | A measured SPF value associated primarily with protection against UV-induced erythema/sunburn response |
| PA++++ | The PA system’s highest UVA protection grade, corresponding to UVAPF 16 or above |
Neither label by itself tells you the complete formula, texture, finish, water resistance, packaging performance or how the product will feel to a particular individual.
What does “Broad Spectrum” mean?
“Broad Spectrum” is another UVA-and-UVB related claim, but its exact regulatory test depends on the market.
In the United States, the FDA allows a sunscreen to use the Broad Spectrum designation when it passes the specified broad-spectrum test, which evaluates ultraviolet absorbance across UVA and UVB wavelengths. This is a different labelling framework from the PA-plus system commonly seen on Asian sunscreen products.
That means a product labelled “PA++++” and a product labelled “Broad Spectrum” may both communicate UVA-related protection, but the wording and regulatory test framework are not identical.
SPF 50 vs SPF 50+
“SPF 50+” is used in some labelling systems when measured SPF exceeds a specified upper display threshold. The exact display convention depends on the applicable standard and market rules.
For product comparison, it is safer to record the label exactly as printed rather than silently converting “50+” into an assumed exact SPF number.
Does PA++++ mean a product has a particular SPF?
No. PA describes UVA protection grading; SPF is a separate measure. A label can therefore contain both because they answer different measurement questions.
Does SPF tell you UVA protection?
SPF is primarily a sunburn-protection measure and is commonly treated as UVB-oriented. UVA performance is communicated through a separate UVA test/marking system such as PA/UVAPF or, in some markets, a broad-spectrum requirement.
This is why a sunscreen label should be read as a set of separate attributes rather than one master score.
What else might appear on a sunscreen label?
Depending on the product and market, the pack may also display:
- water-resistance claims;
- directions for use;
- net quantity;
- ingredient list;
- batch and manufacturing details;
- expiry/use-before information;
- manufacturer or importer information; and
- other product claims.
These attributes should be recorded independently. For example, PA++++ does not automatically imply that a sunscreen is water resistant.
How DermaQA would structure sunscreen data
| Field | Example |
|---|---|
| SPF label | SPF 50 |
| PA label | PA++++ |
| Broad-spectrum claim | Stated / not stated |
| Water-resistance claim | Exact wording |
| Pack size | 50 g |
| MRP | As printed/listed |
| Current listed price | Date-stamped |
| Price per gram | Calculated from current price and pack size |
| Last checked | Date |
This turns label terminology into comparable product facts without DermaQA deciding which sunscreen a particular person should use.
Frequently asked questions
Is PA++++ higher than PA+++?
Yes. In the JCIA PA grading system, PA++++ corresponds to UVAPF 16 or more, while PA+++ corresponds to UVAPF 8 to less than 16.
Does SPF 50 mean 50 hours of protection?
No. SPF is not a time multiplier or clock.
Is broad spectrum the same as PA++++?
No. Both can communicate UVA-related protection, but they belong to different testing and labelling frameworks.
Does PA++++ tell me whether the sunscreen is water resistant?
No. Water resistance is a separate product claim.
Sources
- ISO 24444:2019 — in-vivo determination of SPF
- ISO 24442:2022 — in-vivo determination of UVA protection
- Japan Cosmetic Industry Association: SPF and PA standards and notifications
- U.S. FDA: SPF and Broad Spectrum labelling explanation
This page explains sunscreen labels and test terminology. It does not provide medical advice or an individual sunscreen recommendation.